Department Of Environmental Science And Technology

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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
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    Applications of Fe3O4@AC nanoparticles for dye removal from simulated wastewater
    (Elsevier Ltd, 2019) Joshi S.; Garg V.K.; Kataria N.; Kadirvelu K.
    This study deals with the removal of cationic dyes from the simulated wastewater using Fe3O4 nanoparticles loaded activated carbon. Fe3O4@AC nanoparticles were synthesised using co-precipitation methods. The Fe3O4@AC nanoparticles (nps) were characterised using different techniques and data revealed that the synthesised nanoparticles were 6–16 nm in diameter. pHpzc of Fe3O4@AC nanoparticles was 7.8. BET surface area of Fe3O4@AC nps was found to be 129.6 m2/g by single point method and 1061.9 m2/g by multipoint method. Adsorption experiments were performed to optimize the effect of process conditions such as pH of solution, nanoparticles dose, temperature, concentration of dye and contact time on contaminant removal. The maximum uptake capacity of Fe3O4@AC was found to be 138 and 166.6 mg/g for methylene blue and brilliant green dyes, respectively. In order to assess dye adsorption behaviour, adsorption isotherm models viz., Langmuir, Freundlich and Temkin were applied to the data. Langmuir isotherm best fitted [R2 = 0.993 (MB) and R2 = 0.920 (BG)] to the experimental data of both the dyes. Further, Pseudo-second order rate equation fitted better to the experimental data. Reuse potential of the nanoparticles was also investigated for the removal of both the dyes and it is inferred from the data that the synthesised nanoadsorbent has promising reuse potential, therefore can be used for several cycles.
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    Optimization of Pb (II) and Cd (II) adsorption onto ZnO nanoflowers using central composite design: isotherms and kinetics modelling
    (Elsevier B.V., 2018) Kataria N.; Garg V.K.
    This study focused to optimization and screening of parameters for the adsorption of Cd (II) and Pb (II) onto ZnO nanoflowers. These were synthesized by low temperature hydrothermal methods. The surface properties of ZnO nanoflowers, before and after metal adsorption were characterized by FTIR, FESEM and EDX spectra. The adsorption parameters were optimized using central composites design. Adsorption behaviour and metals-adsorbent interaction was evaluated using batch mode experiments and isothermal models. Maximum adsorption capacity of ZnO nanoflowers was 71.5 mg/g and 115 mg/g for Cd (II) and Pb (II), respectively. In isotherms studies, Freundlich model is best fitted to metal adsorption data that indicated multilayer adsorption of Cd (II) and Pb (II) onto ZnO. The rate mechanism of metals ions adsorption was well explained by pseudo-second order models. The Adsorption efficiency of ZnO nanoflowers was analysed in spiked ground water sample also. The reusability of ZnO nanoflowers was also explored upto three cycles.