Subjects -> ENGINEERING (Total: 2688 journals)
    - CHEMICAL ENGINEERING (229 journals)
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    - ELECTRICAL ENGINEERING (176 journals)
    - ENGINEERING (1325 journals)
    - ENGINEERING MECHANICS AND MATERIALS (452 journals)
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    - INDUSTRIAL ENGINEERING (98 journals)
    - MECHANICAL ENGINEERING (115 journals)

CHEMICAL ENGINEERING (229 journals)                  1 2 | Last

Showing 1 - 200 of 234 Journals sorted alphabetically
ACS Applied Nano Materials     Hybrid Journal   (Followers: 9)
ACS Applied Polymer Materials     Hybrid Journal   (Followers: 8)
ACS Engineering Au     Open Access   (Followers: 6)
ACS Environmental Au     Open Access   (Followers: 9)
ACS ES&T Engineering     Hybrid Journal   (Followers: 1)
ACS ES&T Water     Hybrid Journal  
ACS Sustainable Chemistry & Engineering     Hybrid Journal   (Followers: 10)
Acta Chemica Malaysia     Open Access  
Acta Crystallographica Section B: Structural Science, Crystal Engineering and Materials     Hybrid Journal   (Followers: 6)
Acta Polymerica     Hybrid Journal   (Followers: 9)
Additives for Polymers     Full-text available via subscription   (Followers: 20)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 10)
Advanced Chemical Engineering Research     Open Access   (Followers: 52)
Advanced Membranes     Open Access   (Followers: 3)
Advanced Powder Technology     Hybrid Journal   (Followers: 15)
Advances in Applied Ceramics     Hybrid Journal   (Followers: 4)
Advances in Chemical Engineering     Full-text available via subscription   (Followers: 24)
Advances in Chemical Engineering and Science     Open Access   (Followers: 109)
Advances in Polymer Technology     Open Access   (Followers: 14)
Aerosol Science and Engineering     Hybrid Journal  
Aerosol Science and Technology     Hybrid Journal   (Followers: 13)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 6)
All Life     Open Access  
American Journal of Polymer Science & Engineering     Open Access   (Followers: 2)
Annual Review of Analytical Chemistry     Full-text available via subscription   (Followers: 12)
Annual Review of Chemical and Biomolecular Engineering     Full-text available via subscription   (Followers: 12)
Anti-Corrosion Methods and Materials     Hybrid Journal   (Followers: 11)
Applied Petrochemical Research     Open Access   (Followers: 2)
ASEAN Journal of Chemical Engineering     Open Access  
Asia-Pacific Journal of Chemical Engineering     Hybrid Journal   (Followers: 6)
Asian Journal of Applied Chemistry Research     Open Access   (Followers: 1)
Biochemical Engineering Journal     Hybrid Journal   (Followers: 13)
Biofuel Research Journal     Open Access   (Followers: 1)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 10)
Bulletin of Chemical Reaction Engineering & Catalysis     Open Access   (Followers: 3)
Bulletin of Institute of Chemistry and Chemical Technology, Mongolian Academy of Sciences     Open Access  
Bulletin of the Chemical Society of Ethiopia     Open Access   (Followers: 1)
C&EN Global Enterprise     Full-text available via subscription  
Carbohydrate Polymers     Hybrid Journal   (Followers: 9)
Carbon Capture Science & Technology     Open Access  
Case Studies in Chemical and Environmental Engineering     Open Access  
Catalysts     Open Access   (Followers: 11)
Chem Catalysis     Hybrid Journal  
ChemBioEng Reviews     Full-text available via subscription   (Followers: 3)
ChemEngineering     Open Access  
Chemical and Engineering News     Free   (Followers: 22)
Chemical and Materials Engineering     Open Access   (Followers: 54)
Chemical and Petroleum Engineering     Hybrid Journal   (Followers: 8)
Chemical and Process Engineering     Open Access   (Followers: 67)
Chemical and Process Engineering Research     Open Access   (Followers: 64)
Chemical Engineer, The     Partially Free  
Chemical Engineering & Technology     Hybrid Journal   (Followers: 28)
Chemical Engineering and Processing: Process Intensification     Hybrid Journal   (Followers: 15)
Chemical Engineering and Science     Open Access   (Followers: 58)
Chemical Engineering Communications     Hybrid Journal   (Followers: 14)
Chemical Engineering Education     Full-text available via subscription   (Followers: 2)
Chemical Engineering Journal     Hybrid Journal   (Followers: 71)
Chemical Engineering Journal Advances     Open Access   (Followers: 1)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 26)
Chemical Engineering Research Bulletin     Open Access   (Followers: 44)
Chemical Engineering Science     Hybrid Journal   (Followers: 28)
Chemical Geology     Hybrid Journal   (Followers: 31)
Chemical Papers     Hybrid Journal   (Followers: 4)
Chemical Reviews     Hybrid Journal   (Followers: 169)
Chemical Science International Journal     Open Access  
Chemical Society Reviews     Hybrid Journal   (Followers: 44)
Chemical Technology     Open Access   (Followers: 75)
ChemInform     Hybrid Journal   (Followers: 5)
Chemistry & Industry     Full-text available via subscription   (Followers: 6)
Chemistry Africa : A Journal of the Tunisian Chemical Society     Hybrid Journal  
Chemistry Central Journal     Open Access   (Followers: 4)
Chemistry of Materials     Hybrid Journal   (Followers: 162)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 13)
Chempublish Journal     Open Access  
ChemSusChem     Hybrid Journal   (Followers: 7)
Chinese Chemical Letters     Full-text available via subscription   (Followers: 2)
Chinese Journal of Chemical Engineering     Full-text available via subscription   (Followers: 3)
Chinese Journal of Chemical Physics     Hybrid Journal   (Followers: 1)
Cleaner Chemical Engineering     Open Access   (Followers: 2)
Coke and Chemistry     Hybrid Journal   (Followers: 1)
Coloration Technology     Hybrid Journal  
Computational Biology and Chemistry     Hybrid Journal   (Followers: 13)
Computers & Chemical Engineering     Hybrid Journal   (Followers: 12)
CORROSION     Full-text available via subscription   (Followers: 20)
Corrosion Engineering, Science and Technology     Hybrid Journal   (Followers: 35)
Crystal Research and Technology     Hybrid Journal   (Followers: 7)
Current Opinion in Chemical Engineering     Open Access   (Followers: 5)
Current Research in Food Science     Open Access  
Designed Monomers and Polymers     Open Access   (Followers: 1)
Digital Chemical Engineering     Open Access  
Discover Chemical Engineering     Open Access  
Education for Chemical Engineers     Hybrid Journal   (Followers: 5)
Eksergi     Open Access  
Emerging Trends in Chemical Engineering     Full-text available via subscription   (Followers: 3)
EnergyChem     Hybrid Journal   (Followers: 1)
Equilibrium : Journal of Chemical Engineering     Open Access  
Eurasian Chemico-Technological Journal     Open Access  
European Polymer Journal     Hybrid Journal   (Followers: 42)
Fibers and Polymers     Full-text available via subscription   (Followers: 4)
Focusing on Modern Food Industry     Open Access   (Followers: 2)
Food and Environment Safety     Open Access   (Followers: 3)
Food Chemistry     Hybrid Journal   (Followers: 18)
Food Chemistry : Molecular Sciences     Open Access   (Followers: 1)
Food Chemistry : X     Open Access   (Followers: 1)
Food Frontiers     Open Access   (Followers: 1)
Frontiers in Chemical Engineering     Open Access  
Frontiers in Sensors     Open Access   (Followers: 6)
Frontiers in Sustainable Food Systems     Open Access   (Followers: 2)
Frontiers of Chemical Science and Engineering     Hybrid Journal   (Followers: 5)
Gases     Open Access   (Followers: 1)
Gels     Open Access  
Geochemistry International     Hybrid Journal   (Followers: 1)
Graphene Technology     Hybrid Journal  
Green Chemical Engineering     Open Access  
High Performance Polymers     Hybrid Journal   (Followers: 1)
Indian Chemical Engineer     Hybrid Journal   (Followers: 4)
Indian Journal of Chemical Technology (IJCT)     Open Access   (Followers: 9)
Indonesian Journal of Chemical Science     Open Access  
Industrial & Engineering Chemistry     Full-text available via subscription   (Followers: 10)
Industrial & Engineering Chemistry Research     Hybrid Journal   (Followers: 20)
Industrial Gases     Open Access  
Info Chimie Magazine     Full-text available via subscription   (Followers: 1)
International Journal of Ceramic Engineering & Science     Open Access  
International Journal of Chemical Engineering     Open Access   (Followers: 7)
International Journal of Chemical Technology     Open Access   (Followers: 7)
International Journal of Chemistry and Technology     Open Access   (Followers: 1)
International Journal of Chemoinformatics and Chemical Engineering     Full-text available via subscription   (Followers: 2)
International Journal of Food Science     Open Access   (Followers: 3)
International Journal of Industrial Chemistry     Open Access  
International Journal of Innovative Research and Scientific Studies     Open Access   (Followers: 1)
International Journal of Polymeric Materials     Hybrid Journal   (Followers: 6)
International Journal of Waste Resources     Open Access   (Followers: 5)
International Research Journal of Pure and Applied Chemistry     Open Access  
Iranian Journal of Chemistry and Chemical Engineering (IJCCE)     Open Access   (Followers: 1)
Iranian Journal of Polymer Science and Technology     Open Access   (Followers: 1)
Journal of Advanced Manufacturing and Processing     Hybrid Journal  
Journal of Aerosol Science     Hybrid Journal   (Followers: 7)
Journal of Applied Crystallography     Hybrid Journal   (Followers: 7)
Journal of Applied Electrochemistry     Hybrid Journal   (Followers: 12)
Journal of Applied Polymer Science     Hybrid Journal   (Followers: 107)
Journal of Applied Science & Process Engineering     Open Access  
Journal of Biomaterials Science, Polymer Edition     Hybrid Journal   (Followers: 9)
Journal of Biopharmaceutics Sciences     Open Access   (Followers: 3)
Journal of Chemical & Engineering Data     Hybrid Journal   (Followers: 10)
Journal of Chemical and Petroleum Engineering     Open Access   (Followers: 1)
Journal of Chemical Ecology     Hybrid Journal   (Followers: 4)
Journal of Chemical Engineering     Open Access   (Followers: 63)
Journal of Chemical Engineering and Materials Science     Open Access   (Followers: 5)
Journal of Chemical Sciences     Partially Free   (Followers: 22)
Journal of Chemical Technology & Biotechnology     Hybrid Journal   (Followers: 11)
Journal of Chemical Theory and Computation     Hybrid Journal   (Followers: 21)
Journal of CO2 Utilization     Hybrid Journal   (Followers: 1)
Journal of Coating Science and Technology     Hybrid Journal  
Journal of Coatings     Open Access   (Followers: 3)
Journal of Engineered Fibers and Fabrics     Open Access  
Journal of Engineering & Processing Management     Open Access  
Journal of Environmental Chemical Engineering     Hybrid Journal   (Followers: 5)
Journal of Food Chemistry & Nanotechnology     Open Access   (Followers: 1)
Journal of Food Measurement and Characterization     Hybrid Journal  
Journal of Food Processing & Technology     Open Access   (Followers: 1)
Journal of Fuel Chemistry and Technology     Full-text available via subscription   (Followers: 1)
Journal of Geochemical Exploration     Hybrid Journal   (Followers: 4)
Journal of Industrial and Engineering Chemistry     Hybrid Journal   (Followers: 2)
Journal of Information Display     Open Access   (Followers: 1)
Journal of Inorganic and Organometallic Polymers and Materials     Hybrid Journal   (Followers: 8)
Journal of Leather Science and Engineering     Open Access  
Journal of Materials Science and Chemical Engineering     Open Access   (Followers: 1)
Journal of Modern Chemistry & Chemical Technology     Open Access   (Followers: 2)
Journal of Non-Crystalline Solids     Hybrid Journal   (Followers: 7)
Journal of Non-Crystalline Solids : X     Open Access  
Journal of Organic Semiconductors     Open Access   (Followers: 6)
Journal of Physics and Chemistry of Solids     Hybrid Journal   (Followers: 3)
Journal of Polymer and Biopolymer Physics Chemistry     Open Access   (Followers: 7)
Journal of Polymer Research     Hybrid Journal   (Followers: 7)
Journal of Polymer Science Part C : Polymer Letters     Hybrid Journal   (Followers: 5)
Journal of Polymers     Open Access   (Followers: 7)
Journal of Polymers and the Environment     Hybrid Journal   (Followers: 1)
Journal of Powder Technology     Open Access   (Followers: 4)
Journal of Pure and Applied Chemistry Research     Open Access   (Followers: 3)
Journal of the American Chemical Society     Hybrid Journal   (Followers: 323)
Journal of The Institution of Engineers (India) : Series E     Hybrid Journal   (Followers: 2)
Journal of the Taiwan Institute of Chemical Engineers     Hybrid Journal   (Followers: 1)
Journal of the Turkish Chemical Society, Section B : Chemical Engineering     Open Access  
Journal of Water Chemistry and Technology     Hybrid Journal   (Followers: 8)
Journal on Today's Ideas - Tomorrow's Technologies     Open Access   (Followers: 1)
JSFA reports     Full-text available via subscription  
Jurnal Bahan Alam Terbarukan     Open Access  
Jurnal Inovasi Pendidikan Kimia     Open Access  
Jurnal Rekayasa Kimia & Lingkungan     Open Access  
Jurnal Teknologi Dan Industri Pangan     Open Access  
Korean Journal of Chemical Engineering     Hybrid Journal   (Followers: 5)
Kvasný Průmysl     Open Access  
Materials Advances     Open Access   (Followers: 2)
Materials Chemistry and Physics     Full-text available via subscription   (Followers: 15)
Materials Science for Energy Technologies     Open Access  
Materials Sciences and Applied Chemistry     Full-text available via subscription  
Modern Chemistry & Applications     Open Access   (Followers: 1)
Molecular Catalysis     Hybrid Journal   (Followers: 6)
Nanochemistry Research     Open Access   (Followers: 1)
Natural Volatiles & Essential Oils     Open Access  

        1 2 | Last

Similar Journals
Journal Cover
Korean Journal of Chemical Engineering
Journal Prestige (SJR): 0.559
Citation Impact (citeScore): 2
Number of Followers: 5  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1975-7220 - ISSN (Online) 0256-1115
Published by Springer-Verlag Homepage  [2469 journals]
  • The detection of Fe (III) and ascorbic acid by fluorescence quenching and
           recovery of carbon dots prepared from coffee waste

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      Abstract: Abstract Coffee waste-derived carbon dots (C-CDs) that emit blue light were synthesized via hydrothermal process. The synthesized C-CDs have a round shape with average diameter of ∼3.7 nm. The C-CDs show PL emission centered at 450 nm with excitation wavelength at 360 nm. The C-CDs show promising applications as Fe3+ sensors in aqueous solutions by fluorescence quenching. The C-CDs exhibited strong turn-off fluorescence when trace Fe3+ was added to the solution. Furthermore, the C-CDs-Fe3+ can also be used as a turn-on sensor for the detection of ascorbic acid (AA). AA reduces Fe3+ to Fe2+, resulting in the recovery of fluorescence intensity of the quenched C-CDs. Thus, the C-CDs can be used as a rapid and effective dual mode “off-on” fluorescence sensor for Fe3+ and AA. The fluorescence response exhibits a good linear relationship with the concentration of Fe+3 and AA in the range of 0–100 and 0–1 µM, with a limit of detection (LOD) around 4.314 and 0.162 µM, respectively.
      PubDate: 2022-05-21
       
  • Experimental studies of bubble cutting in a lab-scale micro-structured
           bubble column with different liquid viscosity

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      Abstract: Abstract Bubble cutting was realized by installing a wire mesh in a micro-structured bubble column (MSBC) and studied experimentally with liquid viscosity range from 1 to 39.6 mPa·s. A non-intrusive high-speed camera method was used to determine bubble size and size distribution. The changes of gas holdup, bubble size, size distribution and Sauter mean diameter before and after cutting were systematically studied with mesh openings of 3.8 mm and 5.5 mm. Three novel bubble cutting behaviors with uniform cutting, detachment cutting and indirect cutting behavior were observed. In the presence of two wire meshes, the bubble size distribution roughly shows a Gaussian curve distribution and the peak tends to shift towards lower diameters. With increasing liquid viscosity and superficial gas velocity, the dominant peak tends to move towards higher diameters, resulting in poor mesh cutting effect. After cutting, in the case of two wire meshes, the Sauter mean diameter decreased by 33.5% and 22.2% and the gas holdup increased by 3.2–12.2% and 1.2–4.4%, respectively. For the case of 3.8 mm mesh opening, the interfacial area increased by 10–26%, which is much better than 5.5 mm mesh. The mean bubble size above the mesh will grow again and its growth rate depends on the liquid viscosity.
      PubDate: 2022-05-21
       
  • Optimal strategies for supercritical gas antisolvent (GAS) coprecipitation
           of pyrazinamide/PVP particles via response surface methodology

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      Abstract: Abstract This paper concerns optimization and experimental validation of coprecipitation process parameters for preparing particles of Pyrazinamide and Polyvinylpyrrolidone using gas anti-solvent supercritical method. Mixtures of organic solvents (acetone and ethanol) were selected with various combinations of the drug and the polymer. The central composite design (CCD) was adopted to explore the effect of temperature, pressure, antisolvent addition rate, polymer fraction, and ethanol fraction on particle size distribution (PSD) and solubility. The strong likelihood models were developed for all the responses using Design-Expert software. Polymer fraction was the most important (p<0.0001) factor influencing PSD, while pressure and interaction between temperature and polymer fraction significantly affected solubility. The optimal condition was specified at temperature of 50 °C, pressure of 120 bar, antisolvent rate of 16 bar/min, polymer fraction of 30%, and ethanol fraction of 50%. The model was then validated experimentally under the optimal condition and compared with pure PZA and particles obtained from the physical mixture. According to DLS, XRD, FTIR, and FESEM analyses, the crystallinity of PZA-PVP particles was reduced in optimum conditions, leading to higher solubility. Also, the results suggest that it is feasible to produce coprecipitated particles with narrower size distribution by optimized GAS process.
      PubDate: 2022-05-21
       
  • The effects of under-ribs convection on enhanced drainage parallel flow
           field for proton exchange membrane fuel cell

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      Abstract: Abstract A new enhanced drainage parallel (EDP) flow field was designed that not only enhances under-rib convection but also enables a more uniform distribution of hydrogen and oxygen. Through the optimization of the model, we established the influence of the flow field size, relative humidity, and stoichiometric ratio on cell performance. When the rib width is reduced, the maximum power density is improved. Compared with the parallel flow field and serpentine flow field, the maximum power density of the EDP flow field was increased by 69.4% and 7.9%, respectively. Under optimal conditions, the net power of the EDP flow field can reach 0.56 W/cm2. In the single-cell test, the maximum power density of the EDP flow field can reach 1.19 W/cm2. This implies that the EDP flow field has potential application of proton exchange membrane fuel cells.
      PubDate: 2022-05-21
       
  • Biohydrogen production from glycerol by novel Clostridium sp. SH25 and its
           application to biohydrogen car operation

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      Abstract: Abstract Biohydrogen is a clean and efficient source of energy produced easily by anaerobic systems. Therefore, the discovery of novel and efficient production methods and utilization of inexpensive starting material are crucial for economical biohydrogen production. In this study, novel hydrogen producing bacterial strain Clostridium sp. SH25 was screened from the anaerobic sludge obtained from a water treatment plant, which showed a higher hydrogen-producing activity on glycerol than other strains. The effective hydrogen production was evaluated under varying anaerobic culture conditions, and the optimum temperature, initial pH, additional NaCl concentration, and inoculum size were 37 °C, 6.0, 0%, and 10% (v/v), respectively. The cumulative hydrogen production volume from crude glycerol was 24.30±1.07 ml after 36 h. To test the practical application of biohydrogen, a 20 ml culture of Clostridium sp. SH25 was incubated for 12 h and directly applied to a small hydrogen car unit operated for 19.05±0.33 s with 8.37 ± 0.21 m displacement. Overall, identification of the efficient Clostridium sp. SH25 strain resulted in the production of a large amount of biohydrogen, which further supported the operation of a small hydrogen car. This implied a possible application of biosystems in biohydrogen production.
      PubDate: 2022-05-21
       
  • Preparation of polydopamine-coated TiO2 composites for photocatalytic
           removal of gaseous ammonia under 405 nm violet-blue light

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      Abstract: Abstract Although photocatalytic reactions using the ultraviolet (UV) range (particularly UV B (280–320 nm) wavelengths) is well-established, the photocatalytic effect of longer wavelengths (especially that of UVA (≥380 nm) and visible light (≥400 nm)) have only recently been studied and utilized for environmental applications. In this work, we coated polydopamine (PDA) and TiO2 on a support and investigated the synergistic effects of the corresponding composites for the photocatalytic removal of gaseous ammonia under 405 nm violet-blue light. The PDA layer with TiO2 was covalently attached on a ceramic ball using the drop-casting method. The roughness and functional groups of the TiO2-PDA coated ball surfaces were verified using an infrared imaging microscope and field emission scanning electron microscope (FE-SEM). The photocatalytic activity of the obtained hybrid TiO2-PDA coated ball for the removal of ammonia was investigated using a UV C and 405 nm LED lamp at 24 °C. The results showed that both the TiO2 (control sample) and TiO2-PDA coated balls successfully removed ammonia under similar experimental conditions with the 254 nm UV C lamp. Notably, the TiO2-PDA coated ball exhibited an enhanced ammonia removal efficiency of 72% under 405 nm LED light irradiation. Thus, the TiO2-PDA coated ball is a promising indoor air cleaning technique under LED light irradiation.
      PubDate: 2022-05-21
       
  • Decomposition characteristics of SF6 in an electrical tube furnace and a
           pilot system by combustion

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      Abstract: Abstract Sulfur hexafluoride (SF6) is widely used in a variety of industrial processes and commercial products. However, this chemically stable gas is one of the most potent greenhouse gases (GHGs) contributing significantly to global warming. Therefore, to reduce greenhouse gas such as SF6, a new eco-friendly, economic, and stable treatment technology is required. In this study, the thermal decomposition characteristics of SF6 were investigated using a laboratory scale electrical tube furnace reactor and combustion-based pilot system. Based on these results, the SF6 decomposition reaction order is around 1 and its activation energy (Ea) in the investigation temperature range is 238.04–257.18 kJ/mol. This value is used to calculate the reactor size when designing a commercial facility. Also, the experimental results of a combustion-based pilot system indicate that SF6 supply location, reaction temperature, supplied concentration, and fuel/air ratio could affect SF6 decomposition efficiency. The results demonstrate that a 99.9% decomposition efficiency could be achieved in the combustion.
      PubDate: 2022-05-21
       
  • Carbon aerogel from waste corrugated cardboard: Facile preparation,
           characterization, and application to solar steam generation and adsorption
           

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      Abstract: Abstract Carbon aerogel (CASol-Ads) was prepared from waste corrugated cardboard (WCC) by using a green and facile strategy and it was explored as an all-in-one solar evaporator and a floatable absorbent. Thermal conversion of carbon precursor was investigated using thermogravimetric analyzer coupled with Fourier transform infrared spectrometer. The amorphous carbon aerogel was made up of criss-crossing carbon ribbons and it had a typical micromesoporous structure and a specific surface area of 575 m2 g−1. It exhibited remarkable optical absorption over 81.8% in the UV and Vis regions and over 70% in the NIR region. The surface temperature of dry CASol-Ads can achieve 77.9 °C under 1 kW m−2 irradiation. The hydrophilic 3D network structure of CASol-Ads provides a large volume for the storage of liquids; thus, the carbon aerogel was able to store as much as 13.4 times its own weight in water. Solar-driven evaporation rate over CASol-Ads saturated with water was calculated to be 1.68 kg m−2 h−1, which was 4.5 times the value achieved with bare water under 1 kW m−2 irradiation. The adsorption behavior of CASol-Ads for methylene blue (MB) fitted the Langmuir isotherm model with the maximum monolayer adsorption capacity of 108 mg g−1. The monolithic CASol-Ads can be used as a self-floating absorbent for the adsorption of MB from water, and the adsorption kinetics followed pseudo-second-order kinetics model.
      PubDate: 2022-05-17
       
  • High potential of amine rice husk magnetic biocomposites for Cu(II) ion
           adsorption and heterogeneous degradation of contaminants in aqueous
           solution

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      Abstract: Abstract Rice husk (RH) cellulose as a matrix was synthesized for amine rice husk magnetic biocomposite (RB-NH2) by one-pot solvothermal method. The synergic effect of amine on magnetic nanoparticle will enhance the reactivity of material. Ethylene glycol as solvent was used for dissolved iron(III) chloride hexahydrate, Na-acetate anhydrate, and 1,6-hexanediamine, then RH was added, kept at ±200 °C for 6 h. The optimums of Fe contained and amine concentrations on biocomposite were detected at 93% and 2.9 mmol/g, respectively. The surface area of rice husk significantly increased from 1.309 m2 g−1 to 19.45 m2 g−1 when converted to biocomposite. The RB-NH2 has good capability to adsorb Cu(II) ion at 116.45 mg g−1 at pH 5 for 60 min. Surprisingly, during adsorption, the RB-NH2 also worked on reducing the chemical oxygen demand (COD) number, total suspended solid (TSS) and dye for 22%, 54.37%, and 33.74%, respectively. The reuse effectiveness for RB-NH2 showed a good result with four repetitions. The multiple effects of amine rice husk magnetic biocomposite on wastewater contaminants leads to becoming a candidate material to be developed and applied in a wide range of waste water treatment applications.
      PubDate: 2022-05-17
       
  • Effects of cobalt oxide catalyst on pyrolysis of polyester fiber

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      Abstract: Abstract Polyester fiber is a high-molecular-weight compound made from fossil fuels and is used in various synthetic fiber manufacturing processes. In this study, we performed non-catalytic and catalytic pyrolysis experiments using cobalt oxide as a catalyst to recover energy from polyester fiber. The experiment was carried out between 500–900 °C in the presence of N2. Amount of oil formation was the highest at 600 °C in non-catalytic pyrolysis and oil formation of catalytic pyrolysis was the highest at 500 °C. In both non-catalytic pyrolysis and catalytic pyrolysis, gas content was increased and char was decreased with increasing temperature. A marked difference was observed when the catalyst was used; the formation of char was suppressed and oil and gas yields increased. In the catalytic pyrolysis oil, benzoic acid compounds accounted for the largest proportion (16.15 wt%) at 900 °C, but polycyclic aromatic hydrocarbons and phenols were not observed. Benzoic acid is an important precursor material used to synthesize other organic substances, such as phenol and caprolactam. The non-condensable gas content increased from 11.55 wt% to 22.39 wt%, with increasing temperature. In particular, H2 gas yield was 4.44 wt% at 900 °C. Therefore, by using catalytic pyrolysis, high value-added chemicals such as benzoic acid compounds and H2 gas can be recovered at high yield at 900 °C from the polyester fiber. Consequently, unlike the existing treatment methods, the environmental impact of plastics can be reduced by catalytic pyrolysis.
      PubDate: 2022-05-17
       
  • Extraction and phase transformation of iron in fine-grained complex
           hematite ore by suspension magnetizing roasting and magnetic separation

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      Abstract: Abstract Suspension magnetizing roasting-magnetic separation technology was used to extract iron from fine-grained complex hematite ore. The effect of roasting conditions on the magnetizing roasting-magnetic separation process was studied. In summary, a concentrate with TFe grade of 69.96% and Fe recovery of 79.02% could be obtained under conditions of a roasting temperature of 500 °C, roasting time was 12 min, reductant concentration of 30%, and total gas flow of 200 mL/min, while TFe grade of final tailings was 5.66%. The phase composition and X-ray photoelectron spectroscopy analysis showed that hematite in the sample was transformed into magnetite during suspension magnetization roasting. After roasting, the proportion of Fe content in the phase of the magnetite increased from 5.91% in roasting feed to 97.96% in the roasting product. Transmission electron microscopy results also confirmed that hematite was transformed into magnetite with spinel structure, and the newly formed magnetite had good crystallinity. Scanning electron microscopy and BET analysis showed that roasting could increase the specific surface area, total pore volume, and porosity of the roasted product, which would strengthen the internal diffusion of CO and CO2 in the particles, to improve the reduction rate of hematite. The loose internal structure of roasted particles led to the decrease of mechanical properties, which was conducive to improving the subsequent grinding efficiency.
      PubDate: 2022-05-12
       
  • Visible light photocatalytic activity of TiO2 with carbon-fluorine
           heteroatoms simultaneously introduced by CF4 plasma

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      Abstract: Abstract CF4 plasma treatment is performed on commercial TiO2 to improve the photocatalytic efficiency. The CF4 plasma treatment is a facile and fast method for simultaneous introduction of carbon and fluorine atoms onto TiO2. Photodegradation of rhodamine B, methyl orange, and methylene blue is carried out under solar light irradiation to determine its CF4 plasma treatment effect. The dye removal of commercial TiO2 to rhodamine B, methyl orange, and methylene blue is 60.0, 18.9, and 49.2%, respectively, whereas TiO2 treated with CF4 plasma for 50 min is 93.5, 71.0, and 88.6% for rhodamine B, methyl orange, and methylene blue, respectively. In addition, the photodegradation rate constants of TiO2 treated with CF4 plasma for 50 min were 0.0135, 0.0083, and 0.0129 min−1 for rhodamine B, methyl orange, and methylene blue, respectively, which are up to 7.5 times higher than that of untreated TiO2 (0.0049, 0.0011, and 0.0039 min−1). This improvement is attributed to the increase in oxygen vacancies by the introduction of carbon atoms into TiO2 using CF4 plasma treatment. In addition, the F− ions physically adsorbed to the TiO2 surface promote the formation of hydroxyl free radicals, enabling effective decomposition of various dyes.
      PubDate: 2022-05-12
       
  • Deep dechlorination of hydrocarbon oil by reactive adsorption on
           TiO2-based metal oxides

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      Abstract: Abstract This study reports reactive adsorptive dechlorination of hydrocarbon oil over TiO2-based metal oxides at the temperatures of 20–150 °C. TiO2 and a series of TiO2-CeO2 were prepared by precipitation method and characterized by N2 adsorption, XRD, FT-IR, pyridine-IR, NH3-TPD and CO2-TPD. The characterization results showed that both the acidity and basicity of the adsorbent had a significant impact on its dechlorination capacity. TiO2-U precipitated by urea exhibited higher dechlorination capacity than TiO2-A precipitated by ammonia due to the higher surface area, more acid and base amounts of the former. Among various Ti(1−x)CexO2 (x=0.1, 0.3, 0.5, 0.7, 0.9, 1) oxides, Ti0.7Ce0.3O2 and Ti0.3Ce0.7O2 bimetallic oxides showed higher dechlorination capacity than TiO2-U, and the chlorine removal over Ti0.7Ce0.3O2 reached 82.8% after adsorption at 150 °C for 3 h. Mixing 5 wt% of alkali earth metal oxide into Ti0.7Ce0.3O2 mechanically enhanced its dechlorination capacity, and the chlorine removal over Ti0.7Ce0.3O2-BaO reached as high as 92.1%. The chlorine removal increased with increasing the adsorption temperature. Ion chromatography and GC-MS analysis revealed that organochlorine compound was converted into Cl− and its corresponding alcohol over the adsorbent at 150 °C. Finally, the mechanism of reactive adsorption dechlorination was proposed.
      PubDate: 2022-05-12
       
  • Electroactive adsorbent composites of porous graphite carbon/carbon
           nanotube for highly efficient organic dye removal

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      Abstract: Abstract The highest total organic carbon (TOC) and color removal efficiency of Acid Orange 7 (0.1 mM initial concentration) on graphite carbon/carbon nanotubes electrodes (KS44/CNT) reached more than 98% in three hours of Electro-Fenton (EF) treatment under optimal conditions (pH=3 and I=20 mA), compared to carbon graphite electrode developed without carbon nanotubes (KS44-0). The apparent kinetic constants of degradation were 0.17 and 0.12 min−1 for the KS44-(20)/CNT and KS44-0, respectively. The long-term stability and system durability were attributed to the graphite carbon/CNT electrodes due to continuous operating treatment that allowed processing efficiency and reusability without any decrease of the catalytic activity in time after five cycles of use. Regardless of the medium, superior decolorization and TOC removal efficiency were obtained for electrodes (KS44-(20)/CNT) containing 20 wt% of ferrocene powder as catalyst for CNTs’ growth and iron nanoparticle establishment. Furthermore, the presence of CNTs and iron particles as precursors enhanced drastically the electrochemical and physical properties of the electrode synthesized in a one-step process. The results confirmed that carbon electrodes behave as multifunctional materials acting both as adsorbent and active cathode in the electro-Fenton process for the destruction and total mineralization of Acid Orange 7 (AO7) as a model for organic contaminated wastewater.
      PubDate: 2022-05-12
       
  • Modeling of a methanol synthesis process to utilize CO2 in the exhaust gas
           from an engine plant

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      Abstract: Abstract We investigated the conversion of CO2 in the exhaust gas of an engine plant into methanol. The process consists of CO2 purification by an acid gas removal unit (AGRU), mixed reforming, and methanol synthesis. The AGRU removes a large amount of inert gas, yielding CO2 of 98% purity at a recovery rate of 90% for use as feed to the reformer. The reformer temperature of 900 °C led to the almost total consumption of CH4. In the methanol synthesis reaction, the utility temperature had a greater influence on the conversion and methanol production rate than the inlet temperature. The optimal temperature was determined as 180 °C. Because the amount of hydrogen in the reformer effluent produced by dry reforming was insufficient, the steam available in the engine plant was used for mixed (dry and steam) reforming. The steam increased the hydrogen and methanol production rate; however, the compression cost was too high, and there exists an optimal amount of steam in the feed. The techno-economic analysis of the optimal conditions showed that utilization of CO2 in the exhaust gas along with freely available steam is economically feasible and reduces CO2 emissions by over 85%.
      PubDate: 2022-05-12
       
  • Enhancing performance of polyacrylonitrile membranes for pervaporation
           dehydration of ethanol by tailoring morphology and process parameters

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      Abstract: Abstract Development of high performance membranes for ethanol (EtOH) dehydration constitutes one of the main applications of pervaporation technology. In the present study, the properties of membranes derived from PAN were examined for this purpose. Heat treatment and variation of operational parameters were explored as viable strategies for enhancing the process performance. The characteristics of the membranes including morphology, thickness and sorption behavior were investigated in detail to identify their roles. Application of heat treatment with regards to polymer Tg resulted in membranes with distinct morphological and sorption characteristics. Increase in operational temperature was found effective for optimizing the opposing trends of permeate flux and separation factor. The maximum PSI value for the pristine PAN membrane was 5,564.0 g·m−2h−1, which occurred for operation at 50 °C. Also, application of heat treatment led to drop in flux and increase in separation factor by which PSI reached 41.3 kg·m−2h−1, which was 7.5 times than that of pristine PAN membrane. This study demonstrates successful implementation of facile strategies for tuning the characteristics and performance of membranes derived from PAN for efficient dehydration of EtOH via pervaporation process.
      PubDate: 2022-05-10
       
  • A combined cycle power plant integrated with a desalination system:
           Energy, exergy, economic and environmental (4E) analysis and
           multi-objective optimization

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      Abstract: Abstract A cogeneration production system of power and freshwater was studied from the perspective of energy, exergy, economic, and environmental (4E). The main components of this system include a Brayton cycle (BC), dual-pressure heat recovery steam generator (HRSG), steam turbine (ST), and multi-effect evaporation with thermal vapor compression (MEE-TVC). The system was optimized with a multi-objective genetic algorithm using MATLAB software and by considering the performance of two objective functions: the total annual cost (TAC) to minimize and the thermal efficiency to maximize. The results showed that, with increasing gas turbine inlet temperature, thermal efficiency, exergy efficiency, and emission of pollutants improved, but the gain output ratio (GOR) decreased. GOR of desalination system, exergy efficiency of combined cycle power plant (CCPP), and emission of pollutants improved by increasing the compressor pressure ratio. In investigating the number of effects in desalination unit, by increasing this parameter the production of freshwater, GOR and exergy efficiency of MEE-TVC was increased. By adding a duct burner to the cogeneration system, the thermal efficiency, the exergy efficiency, and the net power output were reduced by 0.67, 3.9, and 5.91%, respectively. But the freshwater production, GOR, and TAC was improved about 7.97, 9.69, and 1.265%, respectively.
      PubDate: 2022-05-10
       
  • Box-Behnken design-based biodiesel wastewater treatment using sequential
           acid cracking and electrochemical peroxidation process: Focus on COD,
           oil-grease and volatile fatty acids removals

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      Abstract: Abstract The treatability of biodiesel wastewater by the electrochemical peroxidation process following acidification pretreatment was investigated. Box-Behnken design, one of the experimental designs of response surface methodology, was applied to optimize the process parameters for chemical oxygen demand (COD), oil-grease, and volatile fatty acids (VFAs) removal from biodiesel wastewater. The process parameters, i.e., applied current, H2O2/COD ratio, and reaction time, were optimized and the total cost of the process was determined. After the acidification process as a pretreatment, the COD, oil-grease, and VFAs removal efficiencies were 25.4%, 68.7%, and 50%, respectively Optimum conditions determined by the developed model for maximum oil-grease removal (98.2%) were applied: current 1.0 A, H2O2/COD ratio 0.4, and reaction time 32.8 minutes. This devised Box-Behnken model predicted removal efficiencies of 45.5%, 98.2%, and 49.5% for COD, oil-grease, and VFAs, respectively. The total cost of the process determined by the model and obtained from the validation experiments was 2.03 €/m3 and 1.97 €/m3, respectively. The results of the study showed that the applied process was efficient in pollutant removal from acidified biodiesel wastewater and the Box-Behnken design can be applied to explain the mechanism of the process and optimize the process parameters.
      PubDate: 2022-05-04
       
  • Evaluation of folic acid-conjugated chitosan grafted Fe3O4/graphene oxide
           as a pH- and magnetic field-responsive system for adsorption and
           controlled release of gemcitabine

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      Abstract: Abstract A pH-responsive system was prepared by using a magnetic nanocomposite, folic acid-conjugated chitosan (FA-CS) grafted Fe3O4/GO, and then used for loading and controlled release of an anti-cancer drug, gemcitabine (GEM). The successful synthesis of FA-CS/Fe3O4/GO was confirmed by various characterization techniques such as FE-SEM/EDX, TEM, FT-IR, XRD, TGA, VSM, and BET. The nanocomposite had a mesoporous structure with the specific surface area of 68.96 m2 g−1, the pore volume of 0.25 cm3 g−1, and the mean pore size of 14.78 nm. The optimum conditions for drug loading through adsorption were found to be pH=4, adsorbent dosage of 0.5 g L−1, temperature of 298 K, and contact time of 45 min. Experimental data indicated that GEM adsorption onto FA-CS/Fe3O4/GO has a satisfactory correlation with the pseudo-second-order kinetic and Freundlich isotherm equations. The maximum adsorption capacity of GEM was 221.17 mg g−1 for FA-CS/Fe3O4/GO, which was quite higher than the non-functionalized Fe3O4/GO with the value of 33.99 mg g−1. Furthermore, the in-vitro drug release profile of GEM from drug-loaded FA-CS/Fe3O4/GO was studied within 48 hours at 37 °C, and the results indicated a higher drug cumulative release amount in simulated cancer fluid (pH 5.6) compared to simulated human blood fluid (pH 7.4). Also, the Peppas-Sahlin kinetic model best fitted the release kinetics data. The result of drug release implied that FA-CS/Fe3O4/GO magnetic biocomposite could be a potential carrier for the sustained and controlled release of GEM.
      PubDate: 2022-05-04
       
  • Characteristics of Li2CO3 as sintering aid for Ce0.8Sm0.2O2−δ
           electrolyte in solid oxide fuel cells

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      Abstract: Abstract Owing to its excellent ionic conductivity, 20 mol% samarium doped ceria (Ce0.8Sm0.2O2−δ, SDC) is considered a promising alternative as an electrolyte in solid oxide fuel cells (SOFCs). SDC electrolytes, however, require high sintering temperatures over 1,600 °C to attain sufficient density to be SOFC electrolytes. To lower the SDC sintering temperature, different amounts of Li2CO3 (0–12 mol% of Li) were evaluated as a sintering aid for SDC electrolytes. The SDC electrolyte samples with Li were sintered at 1,400 °C and were compared with SDC electrolytes sintered at 1,600 °C. The SDC electrolyte with 6 mol% of Li sintered at 1,400 °C (Li6SDC1400) was densified to 97.495% of theoretical density (T.D.), which is similar to that achieved by the SDC electrolyte sintered at 1,600 °C (97.433% of T.D.). The improved formation of grain boundary in the Li6SDC1400 sample increased the density of the SDC, resulting in enhancement of ionic conductivity and cell performance. At 800 °C, the maximum power density of the Li6SDC1400 electrolyte sample was 120.15 mW/cm2.
      PubDate: 2022-05-04
       
 
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