Subjects -> ENVIRONMENTAL STUDIES (Total: 913 journals)
    - ENVIRONMENTAL STUDIES (810 journals)
    - POLLUTION (31 journals)
    - TOXICOLOGY AND ENVIRONMENTAL SAFETY (54 journals)
    - WASTE MANAGEMENT (18 journals)

ENVIRONMENTAL STUDIES (810 journals)            First | 1 2 3 4 5     

Showing 601 - 378 of 378 Journals sorted alphabetically
Multequina     Open Access  
Mutation Research/Fundamental and Molecular Mechanisms of Mutagenesis     Hybrid Journal   (Followers: 5)
Mutation Research/Genetic Toxicology and Environmental Mutagenesis     Hybrid Journal   (Followers: 8)
Nano Select     Open Access  
Nanotechnology for Environmental Engineering     Hybrid Journal  
Nativa     Open Access  
Natur und Recht     Hybrid Journal   (Followers: 6)
Natural Areas Journal     Full-text available via subscription   (Followers: 10)
Natural Hazards     Hybrid Journal   (Followers: 53)
Natural Resources     Open Access  
Natural Resources & Engineering     Hybrid Journal  
Natural Resources and Environmental Issues     Open Access   (Followers: 2)
Nature and Culture     Full-text available via subscription   (Followers: 11)
Nature-Based Solutions     Open Access  
Nepal Journal of Environmental Science     Open Access   (Followers: 4)
NeuroToxicology     Hybrid Journal   (Followers: 1)
Neurotoxicology and Teratology     Hybrid Journal   (Followers: 3)
NEW SOLUTIONS: A Journal of Environmental and Occupational Health Policy     Full-text available via subscription   (Followers: 2)
New Zealand Journal of Environmental Law     Full-text available via subscription   (Followers: 4)
NJAS : Wageningen Journal of Life Sciences     Hybrid Journal  
Novos Cadernos NAEA     Open Access  
npj Urban Sustainability     Open Access  
Observatorio Medioambiental     Open Access  
Occupational and Environmental Medicine     Hybrid Journal   (Followers: 18)
Ochrona Srodowiska i Zasobów Naturalnych : Environmental Protection and Natural Resources     Open Access  
Oecologia     Hybrid Journal   (Followers: 54)
Oikos     Hybrid Journal   (Followers: 55)
One Earth     Hybrid Journal   (Followers: 2)
One Ecosystem     Open Access  
Open Environmental Research Journal     Open Access   (Followers: 1)
Open Journal of Marine Science     Open Access   (Followers: 6)
Open Journal of Modern Hydrology     Open Access   (Followers: 5)
Our Nature     Open Access   (Followers: 1)
Pace Environmental Law Review     Open Access   (Followers: 4)
Packaging, Transport, Storage & Security of Radioactive Material     Hybrid Journal   (Followers: 2)
Palaeobiodiversity and Palaeoenvironments     Hybrid Journal   (Followers: 3)
Particle and Fibre Toxicology     Open Access   (Followers: 2)
Pastos y Forrajes     Open Access  
Peer Community Journal     Open Access   (Followers: 8)
Perspectives in Ecology and Conservation     Full-text available via subscription   (Followers: 5)
Pharmacology & Therapeutics     Hybrid Journal   (Followers: 3)
Pharmacology Biochemistry and Behavior     Hybrid Journal   (Followers: 2)
Physio-Géo     Open Access   (Followers: 1)
Pittsburgh Journal of Environmental and Public Health Law     Open Access  
Planet     Open Access   (Followers: 4)
Planeta Amazônia : Revista Internacional de Direito Ambiental e Políticas Públicas     Open Access  
Planning & Environmental Law: Issues and decisions that impact the built and natural environments     Hybrid Journal   (Followers: 6)
Plant Ecology & Diversity     Partially Free   (Followers: 13)
Plant Knowledge Journal     Open Access   (Followers: 1)
Plant, Cell & Environment     Hybrid Journal   (Followers: 8)
Plant-Environment Interactions     Open Access  
Plants, People, Planet     Open Access   (Followers: 1)
Polar Journal     Hybrid Journal   (Followers: 2)
Political Studies     Hybrid Journal   (Followers: 42)
Political Studies Review     Hybrid Journal   (Followers: 18)
Population and Environment     Hybrid Journal   (Followers: 6)
Population Ecology     Hybrid Journal   (Followers: 12)
Practice Periodical of Hazardous, Toxic, and Radioactive Waste Management     Full-text available via subscription  
Presence: Virtual and Augmented Reality     Hybrid Journal   (Followers: 2)
Proceedings of the Institution of Civil Engineers - Waste and Resource Management     Hybrid Journal   (Followers: 1)
Proceedings of the Institution of Mechanical Engineers Part M: Journal of Engineering for the Maritime Environment     Hybrid Journal   (Followers: 3)
Proceedings of the International Academy of Ecology and Environmental Sciences     Open Access   (Followers: 1)
Proceedings of the Vertebrate Pest Conference     Open Access  
Process Integration and Optimization for Sustainability     Hybrid Journal  
Process Safety and Environmental Protection     Hybrid Journal   (Followers: 4)
Producción + Limpia     Open Access  
Progress in Disaster Science     Open Access   (Followers: 1)
Progress in Industrial Ecology, An International Journal     Hybrid Journal   (Followers: 2)
Projets de Paysage     Open Access  
Psychological Assessment     Full-text available via subscription   (Followers: 12)
Public Money & Management     Hybrid Journal   (Followers: 7)
Quaternary     Open Access  
Recursos Rurais     Open Access  
REDER : Revista de Estudios Latinoamericanos sobre Reducción del Riesgo de Desastres     Open Access  
Regional Environmental Change     Open Access   (Followers: 2)
Regional Sustainability     Open Access   (Followers: 1)
Rekayasa     Open Access  
Remediation Journal     Hybrid Journal   (Followers: 8)
Remote Sensing Applications : Society and Environment     Full-text available via subscription   (Followers: 9)
Remote Sensing Letters     Hybrid Journal   (Followers: 46)
Rendiconti Lincei     Hybrid Journal  
Renewable Energy and Environmental Sustainability     Open Access   (Followers: 1)
Renewable Energy Focus     Full-text available via subscription   (Followers: 7)
Research & Reviews : Journal of Ecology     Full-text available via subscription   (Followers: 3)
Research and Practice for Persons with Severe Disabilities     Full-text available via subscription   (Followers: 3)
Research Journal of Environmental Sciences     Open Access   (Followers: 2)
Research Journal of Environmental Toxicology     Open Access   (Followers: 2)
Resources     Open Access  
Resources and Environment     Open Access  
Resources, Conservation & Recycling     Hybrid Journal   (Followers: 20)
Resources, Conservation & Recycling : X     Open Access   (Followers: 1)
Resources, Conservation & Recycling Advances     Open Access   (Followers: 1)
Rethinking Ecology     Open Access  
Reuse/Recycle Newsletter     Hybrid Journal  
Review of Agricultural, Food and Environmental Studies     Hybrid Journal  
Review of Environmental Economics and Policy     Hybrid Journal   (Followers: 11)
Revista AIDIS de Ingeniería y Ciencias Ambientales. Investigación, desarrollo y práctica     Open Access  
Revista Ambivalências     Open Access  
Revista Brasileira de Ciências Ambientais     Open Access   (Followers: 1)
Revista Brasileira de Meio Ambiente     Open Access  
Revista Chapingo. Serie Ciencias Forestales y del Ambiente     Open Access  
Revista Ciência, Tecnologia & Ambiente     Open Access  
Revista de Ciencias Ambientales     Open Access  
Revista de Direito Ambiental e Socioambientalismo     Open Access  
Revista de Direito e Sustentabilidade     Open Access  
Revista de Gestão Ambiental e Sustentabilidade - GeAS     Open Access  
Revista de Investigación en Agroproducción Sustentable     Open Access  
Revista de Salud Ambiental     Open Access  
Revista ECOVIDA     Open Access   (Followers: 4)
Revista Eletrônica de Gestão e Tecnologias Ambientais     Open Access  
Revista Geama     Open Access  
Revista Hábitat Sustenable     Open Access  
Revista Iberoamericana Ambiente & Sustentabilidad     Open Access  
Revista Kawsaypacha: Sociedad y Medio Ambiente     Open Access  
Revista Laborativa     Open Access  
Revista Meio Ambiente e Sustentabilidade     Open Access  
Revista Mundi Meio Ambiente e Agrárias     Open Access  
Revista Verde de Agroecologia e Desenvolvimento Sustentável     Open Access   (Followers: 2)
Rivista di Studi sulla Sostenibilità     Full-text available via subscription   (Followers: 1)
RUDN Journal of Ecology and Life Safety     Open Access  
Russian Journal of Ecology     Hybrid Journal   (Followers: 1)
Safety Science     Hybrid Journal   (Followers: 28)
San Francisco Estuary and Watershed Science     Open Access  
SAR and QSAR in Environmental Research     Hybrid Journal   (Followers: 1)
Saúde e Meio Ambiente : Revista Interdisciplinar     Open Access  
Scandinavian Journal of Work, Environment & Health     Partially Free   (Followers: 13)
Science of The Total Environment     Hybrid Journal   (Followers: 37)
Sciences Eaux & Territoires : la Revue du Cemagref     Open Access  
Social and Environmental Accountability Journal     Hybrid Journal   (Followers: 3)
Sociedad y Ambiente     Open Access  
Soil and Sediment Contamination: An International Journal     Hybrid Journal   (Followers: 3)
Soil and Tillage Research     Hybrid Journal   (Followers: 9)
South Australian Geographical Journal     Open Access  
South Pacific Journal of Natural and Applied Sciences     Hybrid Journal  
Southern African Journal of Environmental Education     Open Access  
Southern Forests : a Journal of Forest Science     Hybrid Journal   (Followers: 3)
Sriwijaya Journal of Environment     Open Access  
Stochastic Environmental Research and Risk Assessment     Hybrid Journal   (Followers: 4)
Strategic Planning for Energy and the Environment     Hybrid Journal   (Followers: 4)
Studies in Conservation     Hybrid Journal   (Followers: 16)
Sustainability     Open Access   (Followers: 21)
Sustainability Agri Food and Environmental Research     Open Access   (Followers: 4)
Sustainability in Environment     Open Access   (Followers: 2)
Sustainable and Resilient Infrastructure     Hybrid Journal  
Sustainable Cities and Society     Hybrid Journal   (Followers: 22)
Sustainable Development     Hybrid Journal   (Followers: 14)
Sustainable Development Law & Policy     Open Access   (Followers: 12)
Sustainable Development Strategy and Practise     Open Access   (Followers: 4)
Sustainable Horizons     Full-text available via subscription   (Followers: 6)
Sustainable Technology and Entrepreneurship     Full-text available via subscription   (Followers: 8)
Sustinere : Journal of Environment and Sustainability     Open Access  
TECHNE - Journal of Technology for Architecture and Environment     Open Access   (Followers: 11)
Tecnogestión     Open Access  
Territorio della Ricerca su Insediamenti e Ambiente. Rivista internazionale di cultura urbanistica     Open Access  
The Historic Environment : Policy & Practice     Hybrid Journal   (Followers: 4)
The International Journal on Media Management     Hybrid Journal   (Followers: 7)
The Ring     Open Access  
Theoretical Ecology     Hybrid Journal   (Followers: 15)
Toxicologic Pathology     Hybrid Journal   (Followers: 18)
Toxicological & Environmental Chemistry     Hybrid Journal   (Followers: 2)
Toxicological Sciences     Hybrid Journal   (Followers: 11)
Toxicology     Hybrid Journal   (Followers: 18)
Toxicology and Applied Pharmacology     Hybrid Journal   (Followers: 24)
Toxicology and Industrial Health     Hybrid Journal   (Followers: 6)
Toxicology in Vitro     Hybrid Journal   (Followers: 11)
Toxicology Letters     Hybrid Journal   (Followers: 15)
Toxicology Mechanisms and Methods     Hybrid Journal   (Followers: 7)
Toxicon     Hybrid Journal   (Followers: 5)
Toxicon : X     Open Access  
Toxin Reviews     Hybrid Journal  
Transactions on Environment and Electrical Engineering     Open Access  
Transportation Research Part D: Transport and Environment     Hybrid Journal   (Followers: 28)
Transportation Safety and Environment     Open Access   (Followers: 1)
Transylvanian Review of Systematical and Ecological Research     Open Access  
Trends in Ecology & Evolution     Full-text available via subscription   (Followers: 242)
Trends in Environmental Analytical Chemistry     Hybrid Journal   (Followers: 3)
Trends in Pharmacological Sciences     Full-text available via subscription   (Followers: 19)
Tropicultura     Open Access  
Turkish Journal of Engineering and Environmental Sciences     Open Access   (Followers: 1)
UCLA Journal of Environmental Law and Policy     Open Access   (Followers: 1)
UD y la Geomática     Open Access  
Universidad y Ciencia     Open Access  
Universidad y Ciencia     Open Access  
UNM Environmental Journals     Open Access  
Urban Studies     Hybrid Journal   (Followers: 69)
Urban Transformations     Open Access  
Veredas do Direito : Direito Ambiental e Desenvolvimento Sustentável     Open Access  
VertigO - la revue électronique en sciences de l’environnement     Open Access   (Followers: 1)
Villanova Environmental Law Journal     Open Access  
Waste Management & Research     Hybrid Journal   (Followers: 6)
Water Conservation Science and Engineering     Hybrid Journal   (Followers: 1)
Water Environment Research     Full-text available via subscription   (Followers: 43)
Water International     Hybrid Journal   (Followers: 19)
Water Security     Hybrid Journal   (Followers: 6)
Water, Air, & Soil Pollution : Focus     Hybrid Journal   (Followers: 7)
Water, Air, & Soil Pollution     Open Access   (Followers: 21)
Weather and Forecasting     Hybrid Journal   (Followers: 43)
Weather, Climate, and Society     Hybrid Journal   (Followers: 16)
Web Ecology     Open Access   (Followers: 3)
Wetlands     Hybrid Journal   (Followers: 25)

  First | 1 2 3 4 5     

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Journal Cover
Nanotechnology for Environmental Engineering
Number of Followers: 0  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 2365-6379 - ISSN (Online) 2365-6387
Published by Springer-Verlag Homepage  [2469 journals]
  • Adsorption and photocatalytic degradation of auramine–O dye using carbon
           nanoparticles and Carbon–CaO nanocomposites

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      Abstract: Abstract Paper dyeing industries are using different kinds of dyes for producing variety of paper qualities. Auramine-O (Au-O) dye is one of the major sources of colour effluents from paper dyeing industries, and they cause long-term effects for an aquatic environment. The synthesis of carbon nanoparticles (C NPs) from neem leaves and C-CaO nanocomposites (C-CaO NCs) was examined for the adsorption and photocatalytic studies of the Au-O dye. Further their characterization for the degradation of Au-O dye was done based on the analytical techniques, such as powder X-ray diffraction (XRD) and scanning electron microscopy (SEM). During XRD analysis, the average particle size was 6.78 nm and 10.23 nm for pure C NPs and C-CaO NCs, respectively. Further, the adsorption and photocatalytic properties of C NPs and C-CaO NCs for 2 h by observing the degradation process of the Au-O dye with the time interval of every 5 min through a UV–Visible spectrophotometer were examined. The obtained results indicate that C NPs act as better adsorbents only (91.56%), while C-CaO NCs acts as both an adsorbent (90.34%) and photocatalyst (88.39%). So, it can be concluded that the degradation of Au-O dye by adsorption process using C-CaO NCs alone is a cost-effective and harmless method, and also C NPs synthesized from neem leaves does not produce any side effects.
      PubDate: 2022-06-16
       
  • Synthesis and physicochemical characterization of silver nanoparticles
           from the dye-yielding plants, Terminalia paniculata and Mallotus
           philippensis

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      Abstract: Abstract Dye-yielding plants have been proved to be strong candidates for several scientific experiments. But the exploration of these plants in the field of nanotechnology is mere. On this background, the present study is mainly focused on the synthesis of silver nanoparticles (AgNPs) from the fruit extracts of two important dye-yielding plants, i.e., Terminalia paniculata (TP) and Mallotus philippensis (MP). The combined action of methanolic fruit extracts and silver nitrate solution might be responsible for the synthesis of AgNPs. Physicochemical profiling was also performed for the detailed characterization of AgNPs. Ultraviolet–visible–near infrared (UV–Vis–NIR) spectral analysis, field emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray (EDAX) analysis and X-ray diffraction (XRD) techniques were adopted to characterize the synthesiszed AgNPs. From UV–Vis–NIR spectroscopy analysis, the surface plasmon resonance (SPR) spectrum of AgNPs produced a significant peak at 456 nm and 438 nm in T. paniculata and M. philippensis, respectively. From the SEM analysis, it was observed that the structure of synthesized AgNPs from both the species varied. Spherical shaped nanoparticles were obtained from T. paniculata, whereas cubical in M. philippensis. SEM coupled with EDAX technique was adopted to expose the elemental composition of the synthesized AgNPs. The prominence of silver was expressed by the characteristic peak which was obtained through the EDAX analysis. The crystalline size of the silver nanoparticles was unveiled by X-ray diffraction technique. So, the present study is a novel attempt to elucidate the potential of dye-yielding plants in nanoparticle synthesis, which can ultimately be a lead toward the use of these plants in green nanotechnology.
      PubDate: 2022-06-11
       
  • Synthesis, characterization, and the effectiveness of cobalt
           hexacyanoferrate nanoparticles in Cs+ adsorbent application

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      Abstract: Abstract Nanoscale cobalt hexacyanoferrate (CoHF) is a low-cost and a good selective adsorbent for cesium (Cs+) removal, which was prepared via a chemical coprecipitation method. Fourier transform infrared spectroscopy, X-ray diffraction, energy-dispersive X-ray spectroscopy, and high-resolution transmission electron microscopy images were obtained to determine the properties and morphologies of the CoHF. It is shown that the CoHF has a cubic structure (space group F-43m), and a Brunauer Emmett Teller surface area of 29.085 m2/g was demonstrated. The isothermal parameters of Cs+ adsorbed at temperatures from 298 to 348 Kelvin (K), according to the Langmuir isotherm model, the maximum value of absorption capacity was calculated to be 197.01 mg/g at 318 K. The Gibbs free energy change (ΔG°) has a negative value from − 37.93 to − 42.47 at different temperatures ranging from 298 to 348 K, indicating that cesium ion adsorption by CoHF is a spontaneous process and the adsorption rate increased with increasing temperature. The mechanism of Cs+ adsorption was examined for the first time by total reflection X-ray fluorescence analysis with a gallium internal standard. In addition, the primary mechanism of Cs+ adsorption through the ion exchange process was also proposed and discussed.
      PubDate: 2022-06-10
       
  • Study and evaluation of the degradation of procion blue dye by the
           ozonation method: parametric and isothermal study

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      Abstract: Abstract The study carried out in this paper is interested in the degradation of wastewater contaminated with dyes, by advanced oxidation processes, namely ozonation. This treatment is carried out by the oxidizing action of the hydroxyl radicals produced in the medium to be treated. These radicals are capable of degrading almost all persistent organic pollutants because of their very high oxidizing power, their reactivity and their non-selectivity towards organic substances. In this context, we carried out an ozonation study of an azo dye, Procion Blue. Parametric effects were applied in this work to study the change in pH over time, the effect of ozonation on dye removal, the effect of the initial dye concentration on ozonation and thé effect of the addition of H2O2 on the ozonation of Procion blue. This study showed that ozonation was very successful in the complete discoloration of a solution of Procion Blue (85%). The kinetic study carried out demonstrated that the experimental results follow pseudo-first-order kinetics. The ozonation process has been shown to be effective in decontaminating water polluted with dyes, which can reach very high levels of mineralization.
      PubDate: 2022-06-09
       
  • Construction of Ag3PO4–TiO2 nano-heterostructure with excellent
           visible-light-driven photocatalytic activity for environmental
           applications

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      Abstract: Abstract Nano-heterostructure constructed from Ag3PO4 and TiO2 has been successfully fabricated by the hydrothermal method with 2–10% of Ag3PO4 (X-AT). All the material properties have been investigated using XRD, HR-TEM, FEG-SEM, UV–Vis (DRS), BET surface area, XPS, and PL spectroscopy. The optoelectronic and structural properties have been correlated with materials photocatalytic performance with visible light illumination. XRD implies the formation of anatase and cubic phases of TiO2 and Ag3PO4 nanoparticles, respectively, with average crystallite size in the range of 18–25 nm. The formation of a proper heterojunction is corroborated by HR-TEM image. The addition of Ag3PO4 decreases the band gap from 3.2 for TiO2 to 2.56 eV for 10-AT heterojunction. The photocatalytic reduction of Cr(VI) and deterioration of basic fuchsin were evaluated for the Ag3PO4–TiO2 nano-heterojunction. 50 ppm of Cr(VI) solution is completely reduced into Cr(III) within 75 min of visible light irradiation using 10-AT, whereas the same material takes 120 min for the complete degradation of 10 ppm of basic fuchsin dye solution. Bare TiO2 and Ag3PO4 show insignificant photocatalytic efficiency under similar conditions. The improvement can be attributed to the synergistic effect of diminished charge carrier recombination and increased visible light absorption due to the surface plasmon resonance of the metallic silver nanoparticle and oxygen vacancies.
      PubDate: 2022-06-09
       
  • A study on the design education method using 3D pen in an era of
           manufacturing change

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      Abstract: Abstract With the development of 3D printing technology, there will be a lot of changes in manufacturing. Recently, research on 3D pen using 3D printing technology is increasing. Unlike 3D printing, 3D pen can print products instantly. So, 3D pen will be applied in various fields. In this study, the design education method using 3D pen was studied. The results of this study are as follows. First of all, design education using 3D pen can develop students’ creativity and problem-solving skills. In particular, this curriculum can be used in making education. The results of studies are expected to be important data for future education. Moreover, these results could be the basis for making textbooks for future schools. In the future, 3D pen should also be developed for students to use in practice.
      PubDate: 2022-06-01
       
  • Green synthesised iron oxide nanoparticles decorated on biochar for
           enhanced natural attenuation in simulated petroleum compromised soil

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      Abstract: Abstract Nanobioremediation is an emerging technique for pollution management. This study aimed to enhance the natural attenuation process during remediation of petroleum polluted soil using a nanocomposite consisting of green synthesised iron oxide nanoparticles decorated on cow bone-derived biochar. The biochar used was produced via slow pyrolysis at 500 °C under low oxygen conditions while the iron oxide nanoparticles were synthesised using extracts from leaves of the pea eggplant (Solanum torvum). The iron oxide-biochar nanocomposite (BCNP) was applied to soil in microcosms at 10% w/w and 15% w/w amendment levels, and the set-ups were monitored for 60 days. At the end of the study, the total cultivable heterotrophic bacterial abundance in the BCNP amended soils were 7.37–8.92 times greater than the observed abundance in the biochar controls. Similarly, total petroleum hydrocarbon removal levels were 28.4 and 26.2% greater (at 10% w/w and 15% w/w BCNP, respectively) than obtained with the plain biochar controls. Klebsiella pneumoniae, Pseudomonas spp. and Bacillus spp. were the predominant cultivable heterotrophic bacterial isolates while Pseudomonas spp., Acinetobacter spp. and Enterobacter spp. dominated amongst the cultivable hydrocarbon utilising bacteria. Metagenomic analysis revealed that the initial dominance of Proteobacteria and Acidobacteria phyla at the onset of the study gave way to the dominance of the Proteobacteria as the study proceeded with Pseudomonas spp. dominating at the genus taxonomic rank. The iron oxide nanoparticle decorated biochar proved effective in boosting natural attenuation in petroleum-compromised soil.
      PubDate: 2022-06-01
       
  • Synthesis, characterisation and adsorption applications of PMMA/ZnO-based
           nanocomposite material

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      Abstract: Abstract The synthesis and adsorption applications of polymethyl methacrylate (PPMA)- and zinc oxide nanoparticles (ZnO NPs)-based adsorbent (PMMA/ZnO) were investigated in this work. FESEM, EDX, FTIR and P-XRD techniques were used to characterise the PMMA/ZnO nanocomposite-based adsorbent. PMMA/ZnO was utilised in the adsorption-based removal of toxic Pb2+, Cd2+ and Cr6+ ions from aqueous solutions. PMMA/ZnO was highly capable of removing Pb2+, Cd2+ and Cr6+ ions at optimised conditions such as 60 min of agitation, 1 g of PMMA/ZnO, pH of 6 and temperature of 60 °C, respectively. Under laboratory conditions, different isotherm and kinetic models were used to evaluate the appropriateness of the adsorption process. The suitability order of isotherm models was Freundlich > Langmuir > Elovich, with rate constants of 5.216, 12.0336 and 4.926 g mg−1 min−1 for Pb2+, Cd2+ and Cr6+ ions, respectively, evaluated using the pseudo-second-order model.
      PubDate: 2022-06-01
       
  • Porous ZnO/hydroxyapatite nanomaterials with effective photocatalytic and
           antibacterial activities for the degradation of antibiotics

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      Abstract: Abstract Simultaneous photocatalytic and antimicrobial activity is considered a very promising technology for water treatment. By studying their antimicrobial activity, the present study evaluates effect of the association of porous hydroxyapatite with zinc oxide to improve the photodegradation of antibiotics in water and to trap the by-products. Coexistence in the nanocomposite of zinc oxide with porous apatite, prepared from phosphate rock, is a key factor promoting strong photocatalytic and antibacterial activities. Toxicity of the water discharged after the photocatalytic treatment was studied. Owing to the simplicity of the synthesis of ZnO–hydroxyapatite nanocomposites from Moroccan natural phosphate and their versatility, the present approach holds promise for the development of multifunctional photocatalysts and antibacterial agents for environmental applications.
      PubDate: 2022-06-01
       
  • Improving the operation safety of the high-speed train by catenary carrier
           communication and nanotechnology

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      Abstract: Abstract The birth of nanotechnology plays a leading role. China’s high-speed railway train operation has high reliability, but its safety still has defects. The main problem is that the information source received by the vehicle receiving end is single, which cannot fully guarantee the security of the information at the output end of the vehicle equipment. In this paper, some solution is presented, that is how to make full use of the carrier communication technique and nanotechnology by catenary to transmit the train operation information, take it as the redundant source of high-speed train communication, and improve the safety of the output information.
      PubDate: 2022-06-01
       
  • A study on the environmental upgrade path of the commercial district in
           Liangping District, Chongqing

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      Abstract: Abstract Liangping district, which is located in both the Three Gorges Reservoir area of Northeast Chongqing and Chengdu-Chongqing economic circle, is acting as a bridge and pivot between the “Belt and Road” and the “Yangtze River Economic Zone.” High-quality business districts play a vital role in gathering popularity, developing the economy and improving residents’ living standards. Therefore, Liangping district should make a comprehensive consideration of the development situation of business, overall planning of the whole region, construction requirements from Chengdu-Chongqing economic zone and the Three Gorges Reservoir area. From the commercial area positioning, dislocation development, intelligent promotion, mode innovation, cultural construction and other aspects, the implementation of “environmental engineering,” strengthen the overall layout, improve the supporting facilities, enrich the commercial format, strengthen comprehensive services, improve the commercial area operating soft and hard environment, realize the commercial area upgrade.
      PubDate: 2022-06-01
       
  • Safety management of environmental construction projects based on BIM and
           RFID technology

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      Abstract: Abstract With the continuous development of China's economy, the pace of urbanization is accelerating, and the upstream and downstream industrial correlation of urban engineering construction projects is even more complex. Therefore, each management link of the environmental construction project has a direct impact on the effectiveness of the project, especially for safety management. The step-wise application of BIM and RFID technologies provides a more viable method for the safety management of construction projects. This paper aims to study the safety management of construction projects based on BIM and RFID technologies. This article selects the construction project safety management as the research object, applies BIM and RFID technology to the construction project safety management process, summarizes the application of BIM and RFID technology in the construction project safety management, and designed the technical construction project safety management platform based on BIM and RFID.
      PubDate: 2022-06-01
       
  • Mechanical strength optimization and simulation of cement kiln dust
           concrete using extreme vertex design method

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      Abstract: Abstract Extreme vertex design (EVD) method was adapted for the experimental investigation involving the incorporation of industrial waste known as cement kiln dust (CKD) for concrete production; to encourage reuse and recycling of wastes and to achieve eco-friendly construction materials. This design method is mostly suited for factor levels impose with multiple constraints. Components’ constraint formulation was imposed expertly through the relevant literatures to determine the mixture-simplex bounded regions. The laboratory results obtained indicate maximum compressive-strength of 34.85 N/mm2 with concrete mixture-ratio of 13.0434%-cement, 13.043%-CKD, 26.09%-fine-aggregate, 34.78%-coarse-aggregate and 13.0434%-water while the minimum of 18 N/mm2 was obtained with mixture-ratio of 13.79%-cement, 2.299%-CKD, 39.08%-fine-aggregate, 36.78%-coarse-aggregate and 8.05%-water. The generated results were utilized for model-development and statistical-analysis. The statistical influence and diagnostic test results showed a good statistical correlation and points of great influence. The desirability-function was further deployed to achieve numerical and statistical optimization in-order to derive the optimal-solution for the factor-levels combination at 0.15:0.15:0.3:0.4 for cement, CKD, fine-aggregate and coarse-aggregate, respectively. A desirability computation result of 0.907 was obtained with optimal-response of 33.283 N/mm2. Model simulation was further carried out to test the EVD-model’s applicability using Student’s t-test and ANOVA. The results of statistical analysis indicated p-value > 0.05, showing no significant difference between the EVD-model simulated results and actual values.
      PubDate: 2022-06-01
       
  • Comparative analysis of PWM techniques for 15-level cross-connected H
           bridge inverter

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      Abstract: Abstract The total harmonic distortion of the voltage plays an important role in selecting filter components. Multilevel inverters are one of the solutions for reducing total harmonic distortion and filter components. This paper discusses about third harmonic PWM controlled three-phase 15-level cross-H bridge multilevel inverter fed induction motor. The total harmonic distortion and losses of switches are calculated for third harmonic PWM, and the same are compared with a single pulse PWM controlled 3-Ø 15-level cross-H bridge multilevel inverter fed induction motor. The simulation of the third harmonic PWM and single pulse PWM fed 3-Ø 15-level cross-H bridge multilevel inverter fed induction motor is performed in MATLAB/SIMULINK environment.
      PubDate: 2022-06-01
       
  • Degradation of 4-aminopyridine using bio-mediated Ag-doped Cu2O
           nanoparticles under visible light

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      Abstract: Bio-mediated Ag-doped cuprous oxide nanoparticles (Ag@Cu2O NPs) were synthesised using Tabernaemontana divaricate leaves extract, as a reducing agent for the reduction Ag+ to Ag0. Synthesised Ag@Cu2O NPs were characterised by several techniques such as UV–Vis spectroscopy, FT-IR and XRD. Doping Ag onto Cu2O nanoparticles reduced the bandgap of Cu2O to 1.8 eV from 2.1 eV and enhanced photocurrent. The crystallite size of prepared Ag@Cu2O NPs was estimated to be 48 nm using Scherrer’s equation. The photocatalytic activity of Ag@Cu2O NPs was tested against 4-aminopyridine under visible light. The synthesised photocatalysis showed 95% degradation efficiency and 98% chemical oxygen demand removal for 4-aminopyridine at optimized conditions (4-aminopyridine: 5 ppm, catalyst dosage: 0.8 g/L and temperature 30 °C) after 235 min of reaction time at pH 3. Graphical abstract
      PubDate: 2022-06-01
       
  • Green synthesis of silver nanoparticles from Euphorbia and its biological
           activities

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      Abstract: Abstract Nanotechnology is important in all fields of science. Silver nanoparticles, among the many metal nanoparticles, play an essential role in a wide range of applications in diverse fields. Nanoparticles are created using a variety of physical and chemical approaches. Synthesis utilising plant extracts, on the other hand, appears to be more important because it avoids the drawbacks of traditional procedures, such as time-consuming, high-energy needs, and the use of dangerous chemicals. Plant extract-based silver nanoparticle synthesis is usually eco-friendly, environmentally benign, low-cost, and readily scaled up for large-scale synthesis, and it is always preferable due to its advantages over other conventional approaches. Euphorbia plants are therapeutic as well as pharmacologically important. They contain a variety of phytoconstituents with a wide range of possible bioactivities and functional groups. Proper awareness of the participation of phytometabolites during the creation of nanoparticles is highly advised for better nanotechnology advancements. Previous research on the Euphorbia genus indicated phytoconstituents’ potential applications in a variety of disciplines. Due to the scarcity of research in this subject, the manufacture of silver nanoparticles and subsequent analysis of the role of phytometabolites will be extremely beneficial. The utilisation of several extracts from different Euphorbia plant species for the green production of silver nanoparticles is discussed here. Different phytochemicals involved in the nanoparticles’ synthetic mechanism and phytoconstituents that act as stabilising, capping agents during nanoparticle production are also described. The bioactivities of the produced silver nanoparticles varied, with antibacterial characteristics being the most important. In this review, the antifungal, antiparasitic, nematicidal, anticancer, anti-inflammatory, antiplasmodial, antioxidant, and larvicidal capabilities of biosynthesised silver nanoparticles are briefly discussed.
      PubDate: 2022-06-01
       
  • Denitrification performance of kaolin and modified kaolin for the
           treatment of nitrate contaminated water: isotherm and kinetic studies

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      Abstract: Abstract The present study focuses on nitrate removal from water using kaolin and modified kaolin in a batch system. The adsorption studies were executed to study the influence of initial pH (2.0–7.0), contact time (5–240 min), adsorbent dosage (1–30g/L), and initial nitrate concentration (50–250 mg/L) using kaolin and modified kaolin as adsorbents. The percentage removal of nitrate was noted to be maximum at pH 2.0. The maximum adsorption capacity of kaolin and modified kaolin was observed at 104.17 mg/g and 109.89 mg/g respectively. Denitrification process followed pseudo second-order kinetic model. The groundwater samples collected from 21 different regions of Bangalore city in India were analyzed for nitrate concentration. It was observed that the nitrate concentration of collected groundwater samples was ranging from a minimum of 3.42 mg/L to a maximum of 75.69 mg/L. Sample collected from Mandur area corresponds to the high nitrate concentration (75.69 mg/L). Higher percentage nitrate removal from the groundwater sample was achieved by modified kaolin (93.10%) compared to kaolin (66.86%). It can be concluded that modified kaolin has exhibited higher potential of nitrate removal compared to kaolin.
      PubDate: 2022-06-01
       
  • Fabrication of ulvan-based ionically cross-linked 3D-biocomposite:
           synthesis and characterization

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      Abstract: Abstract Polysaccharides are among the multifunctional and highly abundant biomolecules of the plant kingdom. Their diversities range from being a homopolymer to heteropolymers with a vast list of applications precisely for the marine algae-derived sulfated polysaccharides. Ulvans, a green marine macroalgae-derived sulphated heteropolymer, have been modified by number of methodologies to prepare biocomposites, tissue scaffolds, hydrogels, aerogels, thin films, etc. The present study demonstrates for the first time use of ionic cross-linking using calcium as a green cross linker to construct a 3D scaffold. The assessment of cross-linking by 1H NMR shows potential involvement of methyl group of l-rhamnose, whereas surface analysis from FE-SEM-EDX rendered heterogeneous spores with a homogeneous distribution of calcium and sulphur. The characterization confirms functional group modifications taking place in the back-bone potentially due to calcium binding. The combined physico-chemical response of the scaffold makes it a potential alternative for a chemically cross-linked synthetic polymers for drug delivery, controlled release, and tissue engineering applications.
      PubDate: 2022-04-28
       
  • Silver nanoparticles synthesized from Launaea sarmentosa extract:
           synthesis, characterization, and antimalarial activity

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      Abstract: Abstract This paper describes a simple and effective green approach for synthesizing silver nanoparticles using Launaea sarmentosa aqueous plant extract. Phytoconstituents screening revealed the presence of tannins and phenolics, terpenoids, and alkaloids, all of which function as both bio-reductants and capping agents for silver nanoparticles formation. The influence of several experimental parameters in the synthesis of silver nanoparticles was optimized. Spectrophotometric analysis with a maximum absorbance peak of 430 nm was accomplished to confirm the successful formation of green silver nanoparticles. A range of characterization techniques was used to study the physicochemical properties of synthesized silver nanoparticles. The results demonstrated spherical and high-stability silver nanoparticles with an average diameter of approximately 30 nm. The silver nanoparticles greenly synthesized from Launaea sarmentosa extract exhibited good antiplasmodial potential against Plasmodium falciparum K1 strain with a 50% inhibitory concentration of 17.21 ± 1.18 µg mL−1 and a 100% growth inhibitor percentage of 312.5 µg mL−1. The proposed method provides a sustainable, low-cost, non-toxic, rapid, and reliable procedure to create silver nanoparticles, which could be a promising alternative treatment for malaria.
      PubDate: 2022-03-04
      DOI: 10.1007/s41204-022-00239-z
       
  • Utilization of Zn–Al–Cl layered double hydroxide as an adsorbent for
           the removal of anionic dye Remazol Red 23 in aqueous solutions: kinetic,
           equilibrium, and thermodynamic studies

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      Abstract: The Zn–Al–Cl Layered Double Hydroxide (Zn–Al–Cl LDH) was synthesized at constant pH by coprecipitation method and then used as an adsorbent for the removal of a reactive azo dye Remazol Red 23 (RR-23). The structural and morphological properties of the synthesized Zn–Al–Cl LDH were determined using X-ray diffraction (XRD), Fourier Transform Infrared spectroscopy (FTIR), Brunauer–Emmett–Teller surface area, Scanning Electron Microscopy, Energy Dispersive X-ray Spectroscopy, Thermogravimetry Analysis, and Differential Thermal Analysis, and the determination of the point of zero charge pHpzc. The adsorption characteristics were studied by optimizing different parameters such as solution pH, contact time, and initial dye concentration. The maximum adsorption capacity was obtained in the pH ranging from 4 to 7. XRD and FTIR results of Zn–Al–Cl LDH before and after adsorption showed that the removal of the dye is due to its adsorption on the surface of the LDH and that there is no intercalation of the dye since no change in the basal spacing was observed. The kinetic data obtained were examined using the pseudo-first and pseudo-second-order equations. The equilibrium adsorption data were studied using the Freundlich and Langmuir models. The adsorption behavior of Zn–Al–Cl LDH fits perfectly the Langmuir isotherm and the pseudo second-order kinetic model. Thermodynamic studies revealed that the RR-23 dye adsorption on Zn–Al–Cl LDH was exothermic and governed by a physisorption \((\Delta_{{{\text{ads}}}} H^{0} < 0)\) , spontaneous \((\Delta_{{{\text{ads}}}} G^{0} < 0)\) and increased the randomness \((\Delta_{{{\text{ads}}}} S^{0} > 0)\) in the adsorbent/adsorbate system. The regeneration study was also conducted in three cycles with 98, 91, and 74% removal efficiency of RR-23. Graphical abstract
      PubDate: 2022-03-04
      DOI: 10.1007/s41204-022-00237-1
       
 
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