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Showing 1 - 200 of 2352 Journals sorted alphabetically
3D Research     Hybrid Journal   (Followers: 17, SJR: 0.214, h-index: 10)
4OR: A Quarterly J. of Operations Research     Hybrid Journal   (Followers: 10, SJR: 1.073, h-index: 25)
AAPS J.     Hybrid Journal   (Followers: 20, SJR: 1.192, h-index: 74)
AAPS PharmSciTech     Hybrid Journal   (Followers: 6, SJR: 0.718, h-index: 54)
Abdominal Imaging     Hybrid Journal   (Followers: 14, SJR: 0.723, h-index: 60)
Abhandlungen aus dem Mathematischen Seminar der Universitat Hamburg     Hybrid Journal   (Followers: 3, SJR: 0.447, h-index: 12)
Academic Psychiatry     Full-text available via subscription   (Followers: 23, SJR: 0.492, h-index: 32)
Academic Questions     Hybrid Journal   (Followers: 8, SJR: 0.135, h-index: 6)
Accreditation and Quality Assurance: J. for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 26, SJR: 0.378, h-index: 30)
Acoustical Physics     Hybrid Journal   (Followers: 11, SJR: 0.355, h-index: 20)
Acoustics Australia     Hybrid Journal  
Acta Analytica     Hybrid Journal   (Followers: 7, SJR: 0.387, h-index: 6)
Acta Applicandae Mathematicae     Hybrid Journal   (Followers: 1, SJR: 0.624, h-index: 34)
Acta Biotheoretica     Hybrid Journal   (Followers: 5, SJR: 0.419, h-index: 25)
Acta Diabetologica     Hybrid Journal   (Followers: 14, SJR: 1.318, h-index: 46)
Acta Endoscopica     Hybrid Journal   (Followers: 1, SJR: 0.113, h-index: 8)
acta ethologica     Hybrid Journal   (Followers: 4, SJR: 0.465, h-index: 23)
Acta Geochimica     Hybrid Journal   (Followers: 5)
Acta Geodaetica et Geophysica     Hybrid Journal   (Followers: 1, SJR: 0.294, h-index: 13)
Acta Geotechnica     Hybrid Journal   (Followers: 7, SJR: 1.818, h-index: 22)
Acta Informatica     Hybrid Journal   (Followers: 5, SJR: 0.524, h-index: 32)
Acta Mathematica     Hybrid Journal   (Followers: 11, SJR: 8.021, h-index: 47)
Acta Mathematica Hungarica     Hybrid Journal   (Followers: 2, SJR: 0.53, h-index: 29)
Acta Mathematica Sinica, English Series     Hybrid Journal   (Followers: 6, SJR: 0.406, h-index: 30)
Acta Mathematica Vietnamica     Hybrid Journal   (SJR: 0.451, h-index: 5)
Acta Mathematicae Applicatae Sinica, English Series     Hybrid Journal   (SJR: 0.22, h-index: 20)
Acta Mechanica     Hybrid Journal   (Followers: 20, SJR: 0.898, h-index: 52)
Acta Mechanica Sinica     Hybrid Journal   (Followers: 5, SJR: 0.426, h-index: 29)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 5, SJR: 0.525, h-index: 18)
Acta Meteorologica Sinica     Hybrid Journal   (Followers: 3, SJR: 0.524, h-index: 14)
Acta Neurochirurgica     Hybrid Journal   (Followers: 7, SJR: 0.833, h-index: 73)
Acta Neurologica Belgica     Hybrid Journal   (Followers: 1, SJR: 0.348, h-index: 27)
Acta Neuropathologica     Hybrid Journal   (Followers: 5, SJR: 6.61, h-index: 117)
Acta Oceanologica Sinica     Hybrid Journal   (Followers: 3, SJR: 0.295, h-index: 17)
Acta Parasitologica     Hybrid Journal   (Followers: 9, SJR: 0.581, h-index: 28)
Acta Physiologiae Plantarum     Hybrid Journal   (Followers: 2, SJR: 0.551, h-index: 39)
Acta Politica     Hybrid Journal   (Followers: 13, SJR: 0.658, h-index: 20)
Activitas Nervosa Superior     Hybrid Journal  
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 5, SJR: 0.103, h-index: 4)
ADHD Attention Deficit and Hyperactivity Disorders     Hybrid Journal   (Followers: 22, SJR: 0.871, h-index: 15)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 8)
Administration and Policy in Mental Health and Mental Health Services Research     Partially Free   (Followers: 15, SJR: 0.795, h-index: 40)
Adsorption     Hybrid Journal   (Followers: 4, SJR: 0.774, h-index: 52)
Advances in Applied Clifford Algebras     Hybrid Journal   (Followers: 3, SJR: 0.319, h-index: 15)
Advances in Atmospheric Sciences     Hybrid Journal   (Followers: 34, SJR: 0.959, h-index: 44)
Advances in Computational Mathematics     Hybrid Journal   (Followers: 15, SJR: 1.255, h-index: 44)
Advances in Contraception     Hybrid Journal   (Followers: 3)
Advances in Data Analysis and Classification     Hybrid Journal   (Followers: 51, SJR: 1.113, h-index: 14)
Advances in Gerontology     Partially Free   (Followers: 8, SJR: 0.141, h-index: 3)
Advances in Health Sciences Education     Hybrid Journal   (Followers: 23, SJR: 1.397, h-index: 42)
Advances in Manufacturing     Hybrid Journal   (Followers: 3, SJR: 0.2, h-index: 4)
Advances in Polymer Science     Hybrid Journal   (Followers: 41, SJR: 0.637, h-index: 89)
Advances in Therapy     Hybrid Journal   (Followers: 5, SJR: 0.79, h-index: 44)
Aegean Review of the Law of the Sea and Maritime Law     Hybrid Journal   (Followers: 7)
Aequationes Mathematicae     Hybrid Journal   (Followers: 2, SJR: 0.882, h-index: 23)
Aerobiologia     Hybrid Journal   (Followers: 1, SJR: 0.511, h-index: 36)
Aesthetic Plastic Surgery     Hybrid Journal   (Followers: 9, SJR: 0.821, h-index: 49)
African Archaeological Review     Hybrid Journal   (Followers: 15, SJR: 0.612, h-index: 24)
Afrika Matematika     Hybrid Journal   (Followers: 1, SJR: 0.248, h-index: 6)
AGE     Hybrid Journal   (Followers: 7, SJR: 1.358, h-index: 33)
Ageing Intl.     Hybrid Journal   (Followers: 7, SJR: 0.337, h-index: 10)
Aggiornamenti CIO     Hybrid Journal   (Followers: 1)
Aging Clinical and Experimental Research     Hybrid Journal   (Followers: 3, SJR: 0.529, h-index: 55)
Agricultural Research     Hybrid Journal   (Followers: 3)
Agriculture and Human Values     Hybrid Journal   (Followers: 13, SJR: 1.197, h-index: 49)
Agroforestry Systems     Hybrid Journal   (Followers: 19, SJR: 0.64, h-index: 56)
Agronomy for Sustainable Development     Hybrid Journal   (Followers: 10, SJR: 1.732, h-index: 59)
AI & Society     Hybrid Journal   (Followers: 7, SJR: 0.171, h-index: 19)
AIDS and Behavior     Hybrid Journal   (Followers: 13, SJR: 2.006, h-index: 71)
Air Quality, Atmosphere & Health     Hybrid Journal   (Followers: 4, SJR: 0.706, h-index: 19)
Akupunktur & Aurikulomedizin     Full-text available via subscription   (Followers: 1)
Algebra and Logic     Hybrid Journal   (Followers: 4, SJR: 0.566, h-index: 18)
Algebra Universalis     Hybrid Journal   (Followers: 2, SJR: 0.388, h-index: 22)
Algebras and Representation Theory     Hybrid Journal   (Followers: 1, SJR: 0.868, h-index: 20)
Algorithmica     Hybrid Journal   (Followers: 8, SJR: 0.898, h-index: 56)
Allergo J.     Full-text available via subscription   (Followers: 1, SJR: 0.183, h-index: 20)
Allergo J. Intl.     Hybrid Journal   (Followers: 2)
Alpine Botany     Hybrid Journal   (Followers: 5, SJR: 0.729, h-index: 20)
ALTEX : Alternatives to Animal Experimentation     Open Access   (Followers: 3, SJR: 1.392, h-index: 32)
AMBIO     Hybrid Journal   (Followers: 15, SJR: 1.094, h-index: 87)
American J. of Cardiovascular Drugs     Hybrid Journal   (Followers: 15, SJR: 0.864, h-index: 39)
American J. of Community Psychology     Hybrid Journal   (Followers: 24, SJR: 1.237, h-index: 83)
American J. of Criminal Justice     Hybrid Journal   (Followers: 7, SJR: 0.634, h-index: 13)
American J. of Cultural Sociology     Hybrid Journal   (Followers: 12, SJR: 0.283, h-index: 3)
American J. of Dance Therapy     Hybrid Journal   (Followers: 4, SJR: 0.175, h-index: 13)
American J. of Potato Research     Hybrid Journal   (Followers: 2, SJR: 0.558, h-index: 35)
American J. of Psychoanalysis     Hybrid Journal   (Followers: 22, SJR: 0.293, h-index: 13)
American Sociologist     Hybrid Journal   (Followers: 14, SJR: 0.18, h-index: 13)
Amino Acids     Hybrid Journal   (Followers: 8, SJR: 1.362, h-index: 83)
AMS Review     Partially Free   (Followers: 4)
Analog Integrated Circuits and Signal Processing     Hybrid Journal   (Followers: 7, SJR: 0.21, h-index: 37)
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 3, SJR: 0.665, h-index: 7)
Analysis in Theory and Applications     Hybrid Journal   (Followers: 1)
Analysis of Verbal Behavior     Hybrid Journal   (Followers: 5)
Analytical and Bioanalytical Chemistry     Hybrid Journal   (Followers: 31, SJR: 1.096, h-index: 123)
Anatomical Science Intl.     Hybrid Journal   (Followers: 2, SJR: 0.301, h-index: 26)
Angewandte Schmerztherapie und Palliativmedizin     Hybrid Journal  
Angiogenesis     Hybrid Journal   (Followers: 3, SJR: 2.212, h-index: 69)
Animal Cognition     Hybrid Journal   (Followers: 16, SJR: 1.122, h-index: 55)
Annales françaises de médecine d'urgence     Hybrid Journal   (Followers: 1, SJR: 0.156, h-index: 4)
Annales Henri Poincaré     Hybrid Journal   (Followers: 3, SJR: 1.377, h-index: 32)
Annales mathématiques du Québec     Hybrid Journal   (Followers: 4)
Annali dell'Universita di Ferrara     Hybrid Journal   (SJR: 0.504, h-index: 14)
Annali di Matematica Pura ed Applicata     Hybrid Journal   (Followers: 1, SJR: 1.167, h-index: 26)
Annals of Behavioral Medicine     Hybrid Journal   (Followers: 11, SJR: 2.112, h-index: 98)
Annals of Biomedical Engineering     Hybrid Journal   (Followers: 18, SJR: 1.182, h-index: 94)
Annals of Combinatorics     Hybrid Journal   (Followers: 3, SJR: 0.849, h-index: 15)
Annals of Data Science     Hybrid Journal   (Followers: 11)
Annals of Dyslexia     Hybrid Journal   (Followers: 9, SJR: 0.857, h-index: 40)
Annals of Finance     Hybrid Journal   (Followers: 28, SJR: 0.686, h-index: 14)
Annals of Forest Science     Hybrid Journal   (Followers: 6, SJR: 0.929, h-index: 57)
Annals of Global Analysis and Geometry     Hybrid Journal   (Followers: 1, SJR: 1.136, h-index: 23)
Annals of Hematology     Hybrid Journal   (Followers: 14, SJR: 1.117, h-index: 62)
Annals of Mathematics and Artificial Intelligence     Hybrid Journal   (Followers: 7, SJR: 0.593, h-index: 42)
Annals of Microbiology     Hybrid Journal   (Followers: 10, SJR: 0.402, h-index: 26)
Annals of Nuclear Medicine     Hybrid Journal   (Followers: 5, SJR: 0.68, h-index: 45)
Annals of Operations Research     Hybrid Journal   (Followers: 8, SJR: 1.186, h-index: 78)
Annals of Ophthalmology     Hybrid Journal   (Followers: 12)
Annals of Regional Science     Hybrid Journal   (Followers: 7, SJR: 0.405, h-index: 42)
Annals of Software Engineering     Hybrid Journal   (Followers: 13)
Annals of Solid and Structural Mechanics     Hybrid Journal   (Followers: 10, SJR: 0.553, h-index: 8)
Annals of Surgical Oncology     Hybrid Journal   (Followers: 15, SJR: 1.902, h-index: 127)
Annals of Telecommunications     Hybrid Journal   (Followers: 7, SJR: 0.315, h-index: 25)
Annals of the Institute of Statistical Mathematics     Hybrid Journal   (Followers: 1, SJR: 0.931, h-index: 31)
Antonie van Leeuwenhoek     Hybrid Journal   (Followers: 5, SJR: 0.992, h-index: 87)
Apidologie     Hybrid Journal   (Followers: 4, SJR: 1.14, h-index: 57)
APOPTOSIS     Hybrid Journal   (Followers: 8, SJR: 1.554, h-index: 87)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2, SJR: 0.354, h-index: 27)
Applications of Mathematics     Hybrid Journal   (Followers: 1, SJR: 0.274, h-index: 20)
Applied Biochemistry and Biotechnology     Hybrid Journal   (Followers: 44, SJR: 0.575, h-index: 80)
Applied Biochemistry and Microbiology     Hybrid Journal   (Followers: 17, SJR: 0.267, h-index: 26)
Applied Cancer Research     Open Access  
Applied Categorical Structures     Hybrid Journal   (Followers: 2, SJR: 0.361, h-index: 21)
Applied Composite Materials     Hybrid Journal   (Followers: 48, SJR: 0.705, h-index: 35)
Applied Entomology and Zoology     Partially Free   (Followers: 3, SJR: 0.554, h-index: 34)
Applied Geomatics     Hybrid Journal   (Followers: 3, SJR: 0.323, h-index: 9)
Applied Geophysics     Hybrid Journal   (Followers: 8, SJR: 0.541, h-index: 13)
Applied Intelligence     Hybrid Journal   (Followers: 11, SJR: 0.777, h-index: 43)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 4, SJR: 0.358, h-index: 34)
Applied Mathematics & Optimization     Hybrid Journal   (Followers: 4, SJR: 0.955, h-index: 33)
Applied Mathematics - A J. of Chinese Universities     Hybrid Journal   (SJR: 0.275, h-index: 8)
Applied Mathematics and Mechanics     Hybrid Journal   (Followers: 5, SJR: 0.37, h-index: 26)
Applied Microbiology and Biotechnology     Hybrid Journal   (Followers: 62, SJR: 1.262, h-index: 161)
Applied Physics A     Hybrid Journal   (Followers: 7, SJR: 0.535, h-index: 121)
Applied Physics B: Lasers and Optics     Hybrid Journal   (Followers: 23, SJR: 0.983, h-index: 104)
Applied Psychophysiology and Biofeedback     Hybrid Journal   (Followers: 8, SJR: 0.677, h-index: 47)
Applied Research in Quality of Life     Hybrid Journal   (Followers: 11, SJR: 0.288, h-index: 15)
Applied Solar Energy     Hybrid Journal   (Followers: 17, SJR: 0.251, h-index: 6)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 4, SJR: 0.351, h-index: 9)
Aquaculture Intl.     Hybrid Journal   (Followers: 22, SJR: 0.613, h-index: 40)
Aquarium Sciences and Conservation     Hybrid Journal   (Followers: 1)
Aquatic Ecology     Hybrid Journal   (Followers: 32, SJR: 0.646, h-index: 44)
Aquatic Geochemistry     Hybrid Journal   (Followers: 4, SJR: 0.764, h-index: 39)
Aquatic Sciences     Hybrid Journal   (Followers: 13, SJR: 1.172, h-index: 53)
Arabian J. for Science and Engineering     Hybrid Journal   (Followers: 5, SJR: 0.345, h-index: 20)
Arabian J. of Geosciences     Hybrid Journal   (Followers: 1, SJR: 0.417, h-index: 16)
Archaeological and Anthropological Sciences     Hybrid Journal   (Followers: 23, SJR: 1.056, h-index: 15)
Archaeologies     Hybrid Journal   (Followers: 12, SJR: 0.397, h-index: 13)
Archiv der Mathematik     Hybrid Journal   (Followers: 1, SJR: 0.597, h-index: 29)
Archival Science     Hybrid Journal   (Followers: 56, SJR: 0.804, h-index: 22)
Archive for History of Exact Sciences     Hybrid Journal   (Followers: 8, SJR: 0.28, h-index: 15)
Archive for Mathematical Logic     Hybrid Journal   (Followers: 1, SJR: 0.946, h-index: 23)
Archive for Rational Mechanics and Analysis     Hybrid Journal   (SJR: 4.091, h-index: 66)
Archive of Applied Mechanics     Hybrid Journal   (Followers: 5, SJR: 0.865, h-index: 40)
Archives and Museum Informatics     Hybrid Journal   (Followers: 133)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 4, SJR: 2.841, h-index: 40)
Archives of Dermatological Research     Hybrid Journal   (Followers: 7, SJR: 0.9, h-index: 65)
Archives of Environmental Contamination and Toxicology     Hybrid Journal   (Followers: 11, SJR: 0.846, h-index: 84)
Archives of Gynecology and Obstetrics     Hybrid Journal   (Followers: 17, SJR: 0.695, h-index: 47)
Archives of Microbiology     Hybrid Journal   (Followers: 8, SJR: 0.702, h-index: 85)
Archives of Orthopaedic and Trauma Surgery     Hybrid Journal   (Followers: 8, SJR: 1.039, h-index: 56)
Archives of Osteoporosis     Hybrid Journal   (Followers: 2, SJR: 1.092, h-index: 13)
Archives of Sexual Behavior     Hybrid Journal   (Followers: 9, SJR: 1.198, h-index: 74)
Archives of Toxicology     Hybrid Journal   (Followers: 16, SJR: 1.595, h-index: 76)
Archives of Virology     Hybrid Journal   (Followers: 5, SJR: 1.086, h-index: 90)
Archives of Women's Mental Health     Hybrid Journal   (Followers: 14, SJR: 1.264, h-index: 50)
Archivio di Ortopedia e Reumatologia     Hybrid Journal  
Archivum Immunologiae et Therapiae Experimentalis     Hybrid Journal   (Followers: 2, SJR: 1.2, h-index: 42)
ArgoSpine News & J.     Hybrid Journal   (SJR: 0.102, h-index: 3)
Argumentation     Hybrid Journal   (Followers: 5, SJR: 0.295, h-index: 18)
Arid Ecosystems     Hybrid Journal   (Followers: 3)
Arkiv för Matematik     Hybrid Journal   (Followers: 1, SJR: 0.948, h-index: 22)
Arnold Mathematical J.     Hybrid Journal   (Followers: 1)
Arthropod-Plant Interactions     Hybrid Journal   (Followers: 2, SJR: 0.797, h-index: 17)
Arthroskopie     Hybrid Journal   (Followers: 1, SJR: 0.145, h-index: 8)
Artificial Intelligence and Law     Hybrid Journal   (Followers: 10, SJR: 0.288, h-index: 25)
Artificial Intelligence Review     Hybrid Journal   (Followers: 14, SJR: 0.948, h-index: 48)
Artificial Life and Robotics     Hybrid Journal   (Followers: 8, SJR: 0.231, h-index: 14)
Asia Europe J.     Hybrid Journal   (Followers: 5, SJR: 0.247, h-index: 9)
Asia Pacific Education Review     Hybrid Journal   (Followers: 12, SJR: 0.371, h-index: 17)
Asia Pacific J. of Management     Hybrid Journal   (Followers: 15, SJR: 1.676, h-index: 50)
Asia-Pacific Education Researcher     Hybrid Journal   (Followers: 12, SJR: 0.353, h-index: 13)
Asia-Pacific Financial Markets     Hybrid Journal   (Followers: 2, SJR: 0.19, h-index: 15)
Asia-Pacific J. of Atmospheric Sciences     Hybrid Journal   (Followers: 20, SJR: 1.006, h-index: 14)
Asian Business & Management     Hybrid Journal   (Followers: 8, SJR: 0.41, h-index: 10)
Asian J. of Business Ethics     Hybrid Journal   (Followers: 7)
Asian J. of Criminology     Hybrid Journal   (Followers: 5, SJR: 0.263, h-index: 8)
AStA Advances in Statistical Analysis     Hybrid Journal   (Followers: 2, SJR: 0.681, h-index: 15)
AStA Wirtschafts- und Sozialstatistisches Archiv     Hybrid Journal   (Followers: 5, SJR: 0.195, h-index: 5)
ästhetische dermatologie & kosmetologie     Full-text available via subscription  

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Journal Cover Adsorption
  [SJR: 0.774]   [H-I: 52]   [4 followers]  Follow
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1572-8757 - ISSN (Online) 0929-5607
   Published by Springer-Verlag Homepage  [2352 journals]
  • Removal of refractory organics from saline concentrate produced by
           electrodialysis in petroleum industry using bone char
    • Authors: Patrícia da Luz Mesquita; Maria Alexandra Pires Cruz; Cássia Ribeiro Souza; Nilza Tatiane G. Santos; Edson Romano Nucci; Sônia Denise Ferreira Rocha
      Pages: 983 - 997
      Abstract: In a scenario of hydric scarcity, water reuse is essential to minimize make-up; however, increased salinity comes along with recycling streams. Crystallization has been evaluated to remove dissolved ions; nevertheless, contaminants affect its efficiency. In this context, the removal of residual organics from the saline concentrate from electrodialysis applied for water reuse in a Brazilian petroleum refinery was investigated. Aiming at establishing a sustainable virtuous circle, bone char, a waste from food industry, 0.5–1.4 mm particle size, was used as adsorbent for refractory organics removal. Equilibrium adsorption time of 4 h was determined from batch experiments (through 72 h, at 25.0 ± 0.1 °C, pH 7.6 ± 0.5 and 200 ± 1 rpm, solid/liquid ratio of 10 g kg−1) in a shaker and a removal of 54% for dissolved chemical oxygen demand (COD) was observed. Adsorption kinetics (pseudo-first and pseudo-second order; Elovich equation) and equilibrium isotherms were evaluated. Pseudo-second order model for kinetics (R2 = 0.9993; k2 = 0.0184 mg−1 min−1; qe = 3.21 mg g−1) and Freundlich isotherm model best fitted to experimental data (R2 = 0.995), suggesting physisorption in multiple layers. The adsorbent thermal regeneration was evaluated (at 300, 500 and 700 °C, for 60, 120 and 180 min). Partial thermal regeneration was achieved at lower temperature and time demands (300 °C and 60 min—dissolved COD removal was around 40% after the first cycle of regeneration). Further investigation, including scaling-up and a cost-benefit analysis, is necessary in order to assess its use as a viable low-cost alternative for this type of effluent.
      PubDate: 2017-11-01
      DOI: 10.1007/s10450-017-9917-y
      Issue No: Vol. 23, No. 7-8 (2017)
  • Effect of Zr and Li on high temperature CO 2 sorption characteristics of
    • Authors: Rajangam Vinodh; Aziz Abidov; Muthiahpillai Palanichamy; Wang Seog Cha; Hyun Tae Jang
      Pages: 1033 - 1039
      Abstract: In this work, a series of Zr and Li incorporated synthetic CaO based sorbents were prepared by a simple precipitation method for high temperature (600–800 °C) CO2 capture. After impregnation and subsequent calcination, the sorbents were characterized by N2 adsorption isotherm, scanning electron microscopy and X-ray diffraction techniques. The cyclic performance in CO2 processes was evaluated by breakthrough measurements. ZrCa3Li4O7 exhibited the maximum CO2 sorption of 28.4 wt% and it showed excellent stability. The CO2 performance of ZrCa3Li4O7 still remained stable when tested under a high decarbonation temperature of 900 °C.
      PubDate: 2017-11-01
      DOI: 10.1007/s10450-017-9915-0
      Issue No: Vol. 23, No. 7-8 (2017)
  • Functionalization of carbon silica composites via in-pore synthesis of
           active sites for NH $$_3$$ 3 and SO $$_2$$ 2 adsorption
    • Authors: Dushyant Barpaga; M. Douglas LeVan
      Pages: 779 - 787
      Abstract: To enhance the gas adsorption of toxic industrial chemicals such as NH \(_3\) and SO \(_2\) , a biphasic carbon silica composite (CSC) is functionalized with combinations of potassium carbonate or potassium phosphate and various metal chlorides with divalent cations. A precipitation reaction occurs within the pores of the CSC between non-monovalent cations and anions to create essentially insoluble active sites. The adsorption capacities of these functionalized materials are measured at atmospheric pressure and low concentrations of NH \(_3\) and SO \(_2\) . Along with capacity performance, the synthesized materials are characterized using X-ray diffraction, porosimetry and pH measurements to analyze the structure, the incorporation, and the effects of impregnation upon functionalization. Results show that successful incorporation of all insoluble precipitates enhances adsorption capacities compared to impregnant-free substrates. Furthermore, characterization results show reduced pore volumes and surface areas of functionalized materials with structural integrity maintained. Both NH \(_3\) and SO \(_2\) adsorption can be improved via dual salt functionalization of metal chlorides with potassium salts which form insoluble precipitates on CSC and MCM-41 adsorbent materials. In order to target both adsorbates effectively, the incorporation of K \(_2\) CO \(_3\) and ZnCl \(_2\) to form ZnCO \(_3\) provides the highest adsorption capacities for both NH \(_3\) and SO \(_2\) .
      PubDate: 2017-08-01
      DOI: 10.1007/s10450-017-9898-x
      Issue No: Vol. 23, No. 6 (2017)
  • Nitrogen substitution and vacancy mediated scandium metal adsorption on
           carbon nanotubes
    • Authors: Michael Rivera Mananghaya; Gil Nonato Santos; Dennis Yu
      Pages: 789 - 797
      Abstract: First-principle calculation reveals that N containing carbon nanotubes (CNTs) can support the functionalization of transition metals such as Sc on the CNT surface. For N-substituted CNTs without a vacancy, the enhanced adsorption results from large electron affinity difference of the N adjacent to C atom. In this case, the N atom activates nearby C atom and enhances its interaction with the Sc metal on the CNT surface. Meanwhile, the formation of a vacancy in CNTs causes local reconstruction of the surface near the vacancy site. Simulation and analysis show that vacancy mediated N substitution is a more favored scheme for Sc functionalization on the surface of CNTs that suppresses the clustering of Sc. The enhanced Sc adsorption in N-doped CNTs with mono- and di-vacancy defects was attributed to strong hybridization between the Scandium d orbital and nitrogen p orbital. The results explain theoretically the mechanism of enhanced functionalization of metals on N doped CNTs and suggests that Sc functionalized nitrogen doped CNTs with vacancies is an excellent candidate for the adsorption of small molecules.
      PubDate: 2017-08-01
      DOI: 10.1007/s10450-017-9901-6
      Issue No: Vol. 23, No. 6 (2017)
  • Adsorption of cesium on bound porous materials containing embedded
           phosphotungstic acid
    • Authors: Iuliia Little; Kenneth Seaton; Esther Alorkpa; Aleksey Vasiliev
      Pages: 809 - 819
      Abstract: The adsorption of cesium on mesoporous silica materials containing embedded phosphotungstic acid (PTA) was studied. The materials contained active adsorbent and binders: γ-Al2O3, kaolin, or charcoal. The presence of Keggin units of PTA in the bound materials was confirmed by FT-IR spectroscopy. Among all materials, the formulation with γ-Al2O3 demonstrated the highest porosity and effectiveness in adsorption. Pure PTA/SiO2 contained a significant fraction of small particles between 100 and 300 nm. However, in the alumina-bound material, they were not detected. SEM imaging showed that these particles occupied interparticle space between larger γ-Al2O3 particles. The material was stable up to 540 °C. In most materials, the adsorption of cesium decreased with increase of the binder contents but not proportionally. The adsorption capacity of all materials depended on the concentration of cesium in the solutions. Maximum adsorption was achieved after 1 h. The adsorption of cesium is controlled by intraparticle diffusion while its rate can be described by the pseudo-second-order model.
      PubDate: 2017-08-01
      DOI: 10.1007/s10450-017-9905-2
      Issue No: Vol. 23, No. 6 (2017)
  • A solid-state 1 H-NMR study of the dynamic structure of ZIF-8 and its role
           in the adsorption of bulky molecules
    • Authors: Takahiro Ueda; Masako Nakai; Tatsuya Yamatani
      Pages: 887 - 901
      Abstract: In order to clarify the adsorption mechanism of the zeolitic imidazolate framework, ZIF-8, for bulky molecules larger than its aperture diameter, the local structure of ZIF-8 and its host–guest interactions were studied by adsorption kinetics, potential energy analysis, and solid-state 1H nuclear magnetic resonance (1H-NMR) spectroscopy. Adsorption kinetics measurements lead to apparent diffusion coefficients for CS2, CDCl3, and CCl4 in ZIF-8 that provide residence times for each molecule in the ZIF-8 micropores. Potential energy analyses using van der Waals pairwise interactions reveal two kinds of feasible sites for bulky molecules in the ZIF-8 micropores, where there are minimal intermolecular interactions between an adsorbate and the pore wall. Each site lies on one of the four diagonal axes of the cubic lattice of the ZIF-8 unit cell. One set of sites corresponds to the side of the micropore where methyl groups form a bottleneck, and the other to the side where CH moieties form the bottleneck. Second-moment analysis of the 1H-NMR resonance line reveals that the 2-methylimidazolate rings undergo flip motions, with flip angles of ~55°, in addition to the rapid axial rotations of their methyl groups. Temperature-dependent spin–lattice relaxation time analyses indicate that adsorptions of these molecules reduce the motions of the 2-methylimidazolate rings. In particular, steric hindrance from bulky molecules such as CDCl3 and CCl4 significantly lowers the flipping frequency of the 2-methylimidazolate ring. The flipping of the 2-methylimidazolate ring results in instantaneous aperture expansion that enables bulky molecules to pass through the ZIF-8 aperture.
      PubDate: 2017-08-01
      DOI: 10.1007/s10450-017-9902-5
      Issue No: Vol. 23, No. 6 (2017)
  • Comments on the size of the adsorbed phase in porous adsorbents
    • Authors: Shivaji Sircar
      Abstract: An alternative to the conventional ‘pore filling model’ for describing Gibbsian surface excess (GSE) isotherm from a liquid mixture on a porous adsorbent is proposed where the adsorbed phase volume is treated as a variable. The new model is tested using GSE isotherm data on various micro and mesoporous adsorbents. The adsorbed phase volume is found to be system specific but always less than the adsorbent pore volume, irrespective of the pore size.
      PubDate: 2017-11-02
      DOI: 10.1007/s10450-017-9914-1
  • Quantum chemical description of formaldehyde (HCHO), acetaldehyde (CH 3
           CHO) and propanal (CH 3 CH 2 CHO) pollutants adsorption behaviors onto the
           bowl-shaped B 36 nanosheet
    • Authors: Zeynab Mohsenpour; Ehsan Shakerzadeh; Morteza Zare
      Abstract: The potential applicability of newly synthesized B36 nanosheet as a chemical sensor for formaldehyde (HCHO), acetaldehyde (CH3CHO) or propanal (CH3CH2CHO) pollutants detection is investigated by employing DFT calculations. The results indicate that although these pollutant molecules weakly interact with concave or convex sides of nanosheet, it remarkably adsorbed at the edge of B36 nanosheet. Indeed, the adsorption of one to six pollutant molecules at the edge of B36 nanosheet is considered to investigate adsorption capacity. The results reveal that the adsorption energies and electronic properties are affected by the number of adsorbed pollutant molecules. The B36 nanosheet is introduced as a chemical sensor for HCOH, CH3CHO or CH3CH2CHO detection due to producing an electrical signal which is sensitive to their concentration.
      PubDate: 2017-10-24
      DOI: 10.1007/s10450-017-9913-2
  • Non-Arrhenius form of the Henry adsorption on inhomogeneous substrates:
           the effect of frozen disorder
    • Authors: V. N. Bondarev; V. V. Kutarov; Е. Schieferstein
      Abstract: Usually, when considering sub-monolayer adsorption at different temperatures T, the logarithm of the Henry constant is represented as \(\ln {K_H}\sim {U_0}/T\) with some constant “heat of adsorption” U 0 > 0. However, such Arrhenius-type form has a clear base only for an ideal translational-invariant crystal substrate. In more real situation, e.g. for a structurally disordered substrate, the “heat of adsorption” will be some random function of two-dimensional coordinates characterized by some distribution function of its different values. Starting from general principles of the theory of Gaussian fluctuations, we show that the adsorption at the substrate with bulk inhomogeneous structure leads to expression \(\ln {K_H}\sim {U_0}/T+{\Delta ^2}/{T^2}\) with some fluctuation quantity Δ. A possibility to observe such “non-Arrhenius” additive seems most favorable at rather low temperatures for substrates modeled by substitutional solid solutions. The theoretical predictions are illustrated by comparison with the experimental data obtained for some disordered adsorbents.
      PubDate: 2017-10-16
      DOI: 10.1007/s10450-017-9909-y
  • Adsorption of phosphoric acid anions on platinum (111)
    • Authors: Lynndle C. Square; Christopher J. Arendse; Theophillus F. G. Muller
      Abstract: The adsorption of phosphoric acid anions on the platinum (111) plane is investigated using Monte Carlo and density functional theory methods. The minimum energy structure is used to generate the adsorption configurations, indicating the preferred adsorption sites. The bond lengths was found from density functional theory calculations and used to gain further insight on the structure due to adsorption. From the density functional calculations the scanning tunnelling microscopy image of the specie with the lowest adsorption energy configuration and shortest bond length was produced.
      PubDate: 2017-10-13
      DOI: 10.1007/s10450-017-9912-3
  • Adsorptive removal of carbonyl sulfide by Fe-modified activated carbon:
           experiments and DFT calculations
    • Authors: Shunzheng Zhao; Honghong Yi; Xiaolong Tang; Fengyu Gao; Jiangen Wang; Yonghai Huang; Zhongyu Yang
      Abstract: Adsorptive removal of carbonyl sulfide (COS) by Fe-modified activated carbon was investigated in this study. A combination of experimental and theoretical method was used to elucidate the adsorption behavior and mechanism of COS. The sorbents were prepared by sol–gel method and the adsorptive performance for COS at 313, 323, 333 and 343 K was studied. Adsorption isotherms revealed that adsorption capacities increased with the increasing of temperature. Langmuir and Freundlich isotherm models were employed to analyze the equilibrium data. The Freundlich adsorption isotherm gave good fittings to the adsorption data. Also, free energy of adsorption, enthalpy, and entropy changes were determined to predict the nature of adsorption. The positive value (+ 68.394 kJ/mol) of the enthalpy change indicated that the adsorption is endothermic process and the adsorption process is a chemisorption. The mechanism of the chemisorption has been studied by using the density functional theory. The results showed that the adsorption of COS is dissociative adsorption. The cleavage of C–S bonds took place, and C–O bonds are adsorbed on the Fe top sites. Density of states analysis revealed that Fe–C–O interaction can be attributed to the bonding among Fe d orbitals, carbon s orbitals, and oxygen p orbitals. A novel type of metal oxide/active carbon was prepared by sol-gel method for the removal of carbonyl sulfide. Adsorption data for COS on the coal-based modified carbons were obtained at 313K, 323K, 333K and 343K. A combination of experimental and theoretical methods was used to elucidate the adsorption behavior and mechanism of COS
      PubDate: 2017-10-09
      DOI: 10.1007/s10450-017-9910-5
  • Experimental adsorption isotherms of CO 2 and CH 4 on STT zeolite:
           comparison with high- and pure-silica zeolites
    • Authors: Hafez Maghsoudi; Azam Aidani
      Abstract: Adsorption isotherms of CO2 and CH4 on a high-silica STT zeolite (Si/Al = 27), an odd zeolite which consists of 7- and 9-MR window openings, were measured over pressure range of 0–100 kPa at temperatures 298, 323 and 348 K. The isotherms follow typical Type-I according to the BDDT classification. Experimental isotherms data of CH4 and CO2 are well described by Langmuir-type isotherms. Calculation of isosteric heats of adsorption along with the isotherms types revealed that CH4 adsorption system is energetically homogeneous while that is heterogeneous for CO2 adsorption. Furthermore, comparison of STT adsorptive performance with high- and pure-silica zeolites led to development of a trade-off plot, i.e. CO2/CH4 selectivity against CO2 adsorption, by ideal adsorbed solution theory (IAST) calculations. The results revealed that Silicalite-1 has the lowest CO2/CH4 selectivity while SSZ-45 is the most selective adsorbent. Additionally, DD3R has the minimum CO2 adsorption amount whereas STT has the highest capacity. CO2/CH4 selectivity of STT is just ~ 12% smaller than that of SSZ-45 (13.30 against 15.12) but its CO2 adsorption is 63% greater than that of SSZ-45 (1.42 against 0.867 mol kg−1). Thus, STT zeolite is superior to the other high- and pure silica zeolite as it has simultaneously both high selectivity and capacity in CO2/CH4 separation.
      PubDate: 2017-10-06
      DOI: 10.1007/s10450-017-9911-4
  • Quantitative analysis porous structure of activated carbon with classical
           density functional theory
    • Authors: Guodong Wang; Jianchun Jiang
      Abstract: Towards development of a more reliable theoretical procedure, we apply a modified classical density functional theory for porous analysis on solid heterogeneity. Such novel theoretical procedure has been used to analyze the pore size distribution (PSD) of five activated carbon samples and to predict the adsorption isotherms of these materials. As for the characterization sensitive with the adopted numerical algorithms, we evaluate the representative of the required PSD by three numerical methodologies with their predictive capability. It is notable that P1 method with B-spline function as prior PSD function form is suitable for the pore-size analysis of activated carbon for its smallest average deviation on isotherm fitting and prediction. Moreover, the effect of hypothesis form on solid heterogeneity is also discussed according to its contribution on the accuracy and stability of the numerical procedure. According to the proposed feature pore width range theory, we discuss the relationship between the numerical procedure and the predictive capability of the characterized PSD. With the fluctuated experimental temperature into consideration, we also make predictive calculation on adsorption capacity of activated carbon within certain error range, which is meaningful for the development of predictive functional in PSD model.
      PubDate: 2017-10-03
      DOI: 10.1007/s10450-017-9904-3
  • Selective adsorption of carbon dioxide, methane and nitrogen using
           resorcinol-formaldehyde-xerogel activated carbon
    • Authors: Ahmed Awadallah-F; Shaheen A. Al-Muhtaseb; Hae-Kwon Jeong
      Abstract: Resorcinol–formaldehyde xerogel was prepared, carbonized and activated in specific conditions to form resorcinol–formaldehyde activated carbon xerogel (RF-ACX) that was to produce microporous nanoparticles. RF-ACX was used in the adsorption of CO2, CH4, and N2 gases. Adsorption/desorption isotherms of CO2, CH4, and N2 gases onto RF-ACX adsorbent were measured gravimetrically by a magnetic suspension microbalance at five different temperatures (20, 30, 40, 50 and 60 °C) in the pressure range of 0–1 MPa. All adsorption/desorption isotherms were found to be favorable and well correlated with dual site Langmuir’s model. The adsorption capacities of the three adsorbates increased with increasing pressure or with decreasing temperature. Nonetheless, the corresponding increase of CO2 adsorption capacity was much higher than those of CH4 and N2. The fitting parameters deduced from dual site Langmuir’s model were used to provide approximate predictions of the adsorption equilibria and selectivities of the corresponding binary mixtures (CO2/CH4, CH4/N2 and CO2/N2), which relate to separation processes of high influence to various energy and environmental applications.
      PubDate: 2017-09-15
      DOI: 10.1007/s10450-017-9908-z
  • Desorption characteristics of H 2 O and CO 2 from alumina F200 under
           different feed/purge pressure ratios and regeneration temperatures
    • Authors: Yun Fei Shi; Xiang Jun Liu; Yu Guo; Mohammad Ali Kalbassi; Ying Shu Liu
      Abstract: Air pre-purification is an important process for industrial air separation with cryogenic distillation method. This process is typically realized by pressure swing adsorption or temperature swing adsorption. H2O and CO2 are the two major components to be removed among the contaminants. In this paper, we establish a mathematical model describing the mass and heat balances in the adsorption bed, and the double-component adsorption/desorption equilibriums of H2O/CO2 on alumina F200. To conduct desorption performance analysis, a one-cycle process consisting of feed, blowdown, and purge step under different operating conditions, such as feed/purge pressure ratio and regeneration temperature, is numerically studied. The effect of heat on the desorption performance of H2O and CO2 is investigated by changing the purge gas temperature within 30–200 °C under feed/purge pressure ratios of 6:1.1 and 10:1.1, respectively. Detailed results of the H2O and CO2 adsorption/desorption behaviors in the bed are demonstrated. The mass and heat transfer characteristics during desorption are also analyzed. Suggestions on the optimization of the heating temperature and duration of purge gas are also proposed.
      PubDate: 2017-09-12
      DOI: 10.1007/s10450-017-9907-0
  • Saturation loadings on 13X (faujasite) zeolite above and below the
           critical conditions. Part III: Inorganic monatomic and diatomic species
           data evaluation and modeling
    • Authors: Dana Abouelnasr; Kevin F. Loughlin; Alaa Al Mousa
      Abstract: The saturation loadings for subcritical adsorption of inorganic monatomic and diatomic species on 13X zeolite are modeled using the modified Rackett model of Spencer and Danner (J Chem Eng Data 17:236–240, 1972) for the saturated liquid densities combined with crystallographic data for the 13X zeolite. A similar equation is derived for supercritical adsorption involving supercritical adsorbate densities and crystallographic data for the 13X zeolite. Adsorption data from the literature are first critically evaluated and then compared to the model. Log–log plots are used to determine whether each isotherm is near saturation; isotherms that exhibit a \({{\left( {\partial \ln q} \right)} \mathord{\left/ {\vphantom {{\left( {\partial \ln q} \right)} {\left( {\partial \ln p} \right)}}} \right. \kern-0em} {\left( {\partial \ln p} \right)}}\) slope of zero at the maximum pressure point are assumed to be saturated. The highest loading is used from each isotherm that approaches saturation. Unsaturated isotherms are not considered further. The theoretical equation satisfactorily models the available experimental data for the data that are subcritical. However, a steric factor is required in the model for iodine. 80% of the data for helium, nitrogen and oxygen are in the supercritical region; this data reveals a linear decreasing trend with increasing reduced temperature Tr. For this data a new supercritical model is developed using the reduced critical adsorbate temperature, TCAR, and the slope of the decreasing linear plot against Tr. The physical phenomena causing this effect is considered to be increasing molecular vibration in the cavity reducing the total molecular loading with temperature rise.
      PubDate: 2017-08-22
      DOI: 10.1007/s10450-017-9906-1
  • Theoretical study of parallel radial adsorber: a novel configuration of
           temperature swing gas adsorption bed
    • Authors: Sina Salimi; Mohsen Gholami
      Abstract: In this study, an innovative parallel radial adsorber (here after PRA) has been presented. The motivation behind developing such a configuration was to enhance the performance of adsorption bed by broadening the possible choices of adsorbent diameter. The proposed arrangement effectively reduces the pressure drop by increasing the gas flow contact area; thus, a smaller adsorbent can be applied in the PRA bed. To quantify the performance of the proposed configuration, the governing equations of the system including conservation of energy, mass (diffusion inside the particles and convection outside the particles) and momentum (Ergun equation) were developed and solved numerically. The pressure drop, break-through time, saturation percentage, and duration of regeneration step were chosen as the key factors for evaluating such a configuration. By applying the new configuration, a magnificent diminution of pressure drop resulted. Therefore, small particles which are opted as the adsorbing media will increase the mass transfer area and subsequently mass transfer rate. The capability of handling high flow rate by the proposed configuration offered good potential for reducing the cycle time. Besides showing this potential, owing to the size of the particles in PRA beds, this configuration enhanced the saturation percentage of the column from 88% (axial bed) to 98% for the case study of natural gas dehydration.
      PubDate: 2017-07-31
      DOI: 10.1007/s10450-017-9899-9
  • Experimental and modelling studies of CO 2 /N 2 mixture separations using
           amine functionalised silicas
    • Authors: E. Tsalaporta; N. Brady; J. M. D. MacElroy
      Abstract: A combined experimental and mathematical investigation of amine modified mesoporous silicas as adsorbent materials for carbon dioxide removal from CO2/N2 gaseous mixtures is undertaken. The experiments are designed to permit the determination of CO2 adsorption equilibria and, as appropriate, the assessment of transport and adsorption/desorption reaction kinetic parameters for CO2 interacting with immobilised mono-, di- and triamine moieties. Both forward and reverse breakthrough analysis techniques and cyclic Pressure Swing Adsorption are employed to highlight the significant importance of the role of adsorbent heterogeneity in the separation process.
      PubDate: 2017-06-26
      DOI: 10.1007/s10450-017-9896-z
  • Adsorption isotherms of carbon dioxide and methane on CHA-type zeolite
           synthesized in fluoride medium
    • Authors: Zahra Pourmahdi; Hafez Maghsoudi
      Abstract: High-silica CHA-type zeolite was synthesized in fluoride medium using fumed silica as silica source. Adsorption isotherms of CO2 and CH4 were measured over pressure range of 0–1100 kPa and at temperatures of 298, 323, 353, and 393 K. The isotherms follow a typical Type-I shape according to the BDDT classification. All adsorption isotherms are well described by Langmuir, Toth and Sips isotherms. Adsorptive performance of the zeolite was compared with other CHA-type zeolites, i.e. SAPO-34, Si-CHA and SSZ-13 using ideal adsorption solution theory. The modeling results revealed that the zeolite has a high CO2/CH4 selectivity, e.g. 6.70 for an equimolar mixture at 298 K and 100 kPa. Isosteric heats of adsorption for both CO2 and CH4 were reasonably constant (20.6 and 24.1 kJ mol−1 at loading of 0.02 mol kg−1 for CH4 and CO2, respectively) showing that the adsorbent is energetically homogenous.
      PubDate: 2017-06-13
      DOI: 10.1007/s10450-017-9894-1
  • In silico investigation of the ozone (O 3 ) binding behavior to the B 36
           bowl-shaped structure
    • Authors: Elham Tahmasebi; Zeinab Biglari; Ehsan Shakerzadeh
      Abstract: The binding of ozone molecule to the B36 bowl-shaped structure is scrutinized using the density functional theory (DFT) calculations. The interactions are investigated using B3LYP, B3LYP-D3, WB97XD, M06-2X and TPPSH methods. The ozone binding to the B36 structure is studied in terms of energetical, structural and electronic features. The results indicate that although ozone molecule weakly interacts with concave side of structure, it adds to the convex side and the edge of B36 structure. The ozone binding to the edge of B36 is more efficient than its convex side. The HOMO–LUMO gaps of the stable systems are reduced with respect to pure B36 sheet. This could be applied as a chemical signal. The obtained results introduce the B36 structure as an efficient ozone adsorbent.
      PubDate: 2017-05-31
      DOI: 10.1007/s10450-017-9891-4
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