Department Of Environmental Science And Technology

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Author: search.filters.author.Kataria, NavishSubject: search.filters.subject.Kinetics

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    Hybrid nanomaterials for the removal of organic pollutants from wastewater
    (Elsevier, 2023-04-21T00:00:00) Sharma, Anchal; Chauhan, Amit Kumar; Kataria, Navish; Garg, Vinod Kumar
    Nanomaterials have recently gained the attention of the scientific community due to their multifarious applications and excellent properties. The unique properties of nanomaterials include small size, high surface area-to-volume ratio, porous structure, magnetic behavior, thermal stability, photocatalysis, etc. Industrial activities are continuously enhancing the pollutant load in different environmental matrices, including aqueous systems. These pollutants may enter the food chain and exert adverse health effects and environmental problems. At this stage, interventions are urgently required to handle water pollutants. Several hybrid nanomaterials including metal oxide/carbon nanocomposites, metal doped composites, surface-functionalized carbon nanotubes and graphene oxide, metal oxide-coated metal oxide frameworks, bimetallic coated biopolymers, metal-coated biomaterials, green fabricated metal/carbon nanocomposites, etc., are being designed and fabricated for the treatment of wastewater. Hybrid nanomaterials have been utilized in various treatment methods such as adsorption, photocatalysis and catalytic reduction, membrane filtration, and an advanced oxidation process for the removal of inorganic and organic compounds. This chapter focuses on the application of hybrid nanomaterials for the removal of organic pollutants from wastewater systems. It also describes the current research progress of nanotechnology in environmental applications with a special emphasis on pollution prevention and the removal of environmental contaminants from contaminated drinking water and industrial wastewater. � 2023 Elsevier Inc. All rights reserved.
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    Biogenic fabrication of ZnO@EC and MgO@EC using Eucalyptus leaf extract for the removal of hexavalent chromium Cr(VI) ions from water
    (Springer Science and Business Media Deutschland GmbH, 2023-01-04T00:00:00) Chauhan, Amit Kumar; Kataria, Navish; Gupta, Renuka; Garg, Vinod Kumar
    Zinc and magnesium oxide nanoparticles were fabricated using green synthesis method for the sequestration of hexavalent chromium Cr(VI) from the aqueous medium. The biogenically prepared ZnO@EC and MgO@EC nanoparticles were successfully loaded on the Eucalyptus. The prepared nanomaterials were characterized using various techniques such as FESEM, TGA, XRD, EDX, FTIR, BET, and elemental mapping. FE-SEM analysis has revealed the surface morphology of ZnO nanoparticles, which were rod-like and spherical in shape, whereas MgO nanoparticles were of irregular shape. Batch mode was selected to remove the hexavalent chromium from aqueous solution using the prepared nanomaterials. The Cr(VI) adsorption was carried out under optimized conditions, viz., pH (3.0), adsorbent dose (0.05�g), contact time (150�min), temperature (25 � 2��C), and initial concentration (50�mg/L). The experimental results were compared using the different isotherm models; The observations have indicated that experimental data fit better with Freundlich (R2 = 0.99) and Langmuir (R2 = 0.99)�isotherms, respectively. The maximum adsorption capacity of ZnO@EC and MgO@EC for Cr(VI) was found to be 49.3 and 17.4�mg/g, respectively. The regeneration study of the adsorbents was conducted using different desorbing agents viz., ethanol, NaOH, and NaCl. The desorbing agent NaOH performed better and showed removal percentage of 34.24% and 20.18% for ZnO@EC and MgO@EC, respectively, after the three reusability cycles. The kinetics of reaction was assessed using the pseudo-first-order and pseudo-second-order kinetic models. The experimental data of both the nanomaterials ZnO@EC and MgO@EC obeyed pseudo-second-order model with correlation coefficient values 0.999 and 0.983, respectively. The thermodynamic study confirmed that adsorption was feasible, spontaneous, and endothermic. The adsorbents were tested for spiked real water which confirms their applicability and potential in real water systems also. The results indicated fair removal of chromium suggesting applicability of both adsorbents. � 2023, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.
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    Sequestration of heavy metals from contaminated water using magnetic carbon nanocomposites
    (Elsevier B.V., 2022-03-30T00:00:00) Kataria, Navish; Chauhan, Amit Kumar; Garg, V.K.; Kumar, Parmod
    Heavy metals are toxic to flora, fauna and human beings. This study focused on removing toxic metals from an aqueous medium using magnetic carbon (Fe3O4@Carbon) nanocomposites. The biogenic green synthesis approach was used to fabricate the magnetic nanocomposite using low-cost poplar sawdust powder. The characterization of the nanocomposites was done using FESEM, TEM BET and FTIR. The sequestration of Pb (II), Cu (II) and Cr (VI) from water by Fe3O4@Carbon nanocomposites were studied under batch mode. The adsorption capacities for Pb (II), Cu (II) and Cr (VI) were 151.5, 48.08, and leaves49.29 mg/g respectively. The removal of metals by magnetic composites was studied in a mono, binary and tertiary network of metal ions. Adsorption isotherms studies indicated the chemosorption of Cu (II) and Cr (VI) onto the surface of nanocomposites. The thermodynamic analysis revealed that removal of studied metals ions is spontaneous and feasible. In this study, the effectiveness of magnetic nanocomposites is also explored for the removal of other heavy metals from tap water and simulated water sample. The heavy metal removal efficiency of the nanocomposites was not affected up to thrice reuse of adsorbent. � 2022