Department Of Environmental Science And Technology
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Item Phytobiomass-based nanoadsorbents for sequestration of aquatic emerging contaminants: An Overview(Elsevier Ltd, 2023-02-15T00:00:00) Sharma, Anchal; Kumar, Nitin; Mudhoo, Ackmez; Garg, Vinod KumarNanotechnology that is based on phytobiomass is a technique that has the potential to play a major role in wastewater treatment since it is environmentally friendly, easy to deploy, and cost-effective. This technology employs plant parts such as leaves, flowers, stems, seeds and roots, and agricultural wastes to synthesize nanoadsorbents. These nanoadsorbents have unique properties, such as smaller size, higher surface-volume ratio, magnetic behaviour, thermal stability, selectivity, porous structure, surface functionalization, catalytic properties and target-specific capabilities, which make them an attractive material for removing �Emerging Contaminants� from contaminated water and wastewater. Pharmaceuticals, personal care products, endocrine disruptors, surfactants, disinfectants, flame retardants and pesticides are the various classes of emerging contaminants used almost every day globally. Adsorption is one green and sustainable technology that has shown excellent performance when employing nanoadsorbents to purify contaminated water. It is an effective and efficient technology for removing emerging contaminants that inform polluted water or wastewater to restore water quality. This review aims to summarize the current research progress in the use of different nanoadsorbents synthesized from various plant parts for removing aqueous emerging contaminants. � 2023 Elsevier LtdItem Application of EDTA modified Fe3O4/sawdust carbon nanocomposites to ameliorate methylene blue and brilliant green dye laden water(Academic Press Inc., 2019) Kataria N.; Garg V.K.This work explored the potential of magnetic sawdust carbon nanocomposites for cationic dyes removal from aqueous medium. EDTA modified magnetic sawdust carbon nanocomposites (EDTA@Fe3O4/SC ncs) were prepared by biogenic green reduction and precipitation approach. The surface properties, structure and composition of nanocomposites were characterized by HRTEM, FESEM, XRD, EDX, BET, FTIR etc. The Fe3O4 nanoparticles were 10-20 nm in diameters and having 14 m2/g surface area. Removal of Methylene blue (MB) and Brilliant green (BG) dyes from aqueous medium was studied in batch mode experiments. The maximum removal was achieved at neutral pH 7.0 with in 30 min. Adsorption capacity of EDTA@Fe3O4/SC for MB and BG dyes was 227.3 mg/g and 285.7 mg/g, respectively. Dye adsorption behaviour is well explained by Freundlich model. The rate of cationic dye adsorption is explained by pseudo-second order model. The value of thermodynamic parameters confirmed that adsorption process was spontaneous and favourable. Desorption and reusable efficiency of nanocomposites was also evaluated.Item Green synthesis, activation and functionalization of adsorbents for dye sequestration(Springer, 2019) Mudhoo, A; Gautam, R.K; Ncibi, M.C; Zhao, F; Garg, V.K; Sillanpää, M.The release of recalcitrant dyes into the biosphere is a threat because of pollution and environmental health issues. Adsorption using commercial activated carbon has been effective in industrial dye-loaded effluent remediation to some acceptable extent. However, commercial activated carbon suffers from limitations related to cost, relatively lower adsorption capacity, fewer microporous and mesoporous networks in comparison with other competing adsorbents, and reduced adsorption efficiency after regeneration. Here we review the recent developments in applying microwave irradiation, ultrasonication, ionic liquids and nanoscience for the preparation, activation, and physical, chemical and biological functionalization of novel and more potent adsorbents such as metal, mineral, carbon and polymer-based nanoparticles for dye removal. We observed that microwave and ultrasound irradiation and the use of ionic liquids are highly beneficial for the preparation of adsorbent materials; those adsorbents display enhanced porous structures and morphologies that account for much larger surface areas for faster adsorption interactions. Graphene-based, magnetic, cellulose-based and nanocomposite adsorbents are more selective and thermally more stable, faster in dye adsorption kinetics, have higher adsorption capacities for many dyes and can be regenerated for reuse without significant decrease in adsorption capacity. The scales of fabrication of green adsorbents do not go beyond the kilogram scale. © 2018, Springer Nature Switzerland AG.Item Application of EDTA modified Fe3O4/sawdust carbon nanocomposites to ameliorate methylene blue and brilliant green dye laden water(Academic Press, 2019) Kataria, N; Garg, V.K.This work explored the potential of magnetic sawdust carbon nanocomposites for cationic dyes removal from aqueous medium. EDTA modified magnetic sawdust carbon nanocomposites (EDTA@Fe3O4/SC ncs) were prepared by biogenic green reduction and precipitation approach. The surface properties, structure and composition of nanocomposites were characterized by HRTEM, FESEM, XRD, EDX, BET, FTIR etc. The Fe3O4 nanoparticles were 10–20 nm in diameters and having 14 m2/g surface area. Removal of Methylene blue (MB) and Brilliant green (BG) dyes from aqueous medium was studied in batch mode experiments. The maximum removal was achieved at neutral pH 7.0 with in 30 min. Adsorption capacity of EDTA@Fe3O4/SC for MB and BG dyes was 227.3 mg/g and 285.7 mg/g, respectively. Dye adsorption behaviour is well explained by Freundlich model. The rate of cationic dye adsorption is explained by pseudo-second order model. The value of thermodynamic parameters confirmed that adsorption process was spontaneous and favourable. Desorption and reusable efficiency of nanocomposites was also evaluated. © 2019 Elsevier Inc.