Sequester adsorption of Cr(VI) and Pb(II) ions from aqueous solution by green synthesized nanocomposite (OB/ZnO): Characterization, kinetics, isotherm and mechanism
2022
Uma Maheswari, B. | Sivakumar, V.M. | Thirumarimurugan, M.
The present work focused on green synthesized nanocomposite,and its potential to remove Cr(VI) and Pb(II) ions. The nanocomposite was synthesized from organically modified bentonite supported by ZnO nanoparticles (OB/ZnO). The characteristics of the assembled OB/ZnO nanocomposite was evaluatedthrough SEM, EDX, XRD, FTIR, BET,and Zeta potential analysis.Surface area and point of chargeof OB/ZnO was found to be217.9 m²/g and 7, respectively.Further, the efficiency was determined based on key factors such as pH, dosage, metal concentration, and, contact time. Maximum adsorption was found at pH 2 (97.19%) for Cr(VI) and 5.6 pH (98.23%) for Pb(II) ions, respectively. Kinetic studies were performed, and found that the pseudo-second model fitted well with the process. Various isotherm models were employed to check the adsorption equilibrium. The maximum uptake capacity based on the Langmuir model was found to be 460.31 mg/g, and 407.6 mg/g, respectively. Thermodynamic analysis revealed that the process is exothermic.Desorption with regeneration (upto five cycles) was carried out. Plausible mechanism, and cost analysis was elucidated. The experimental findings of the present study suggest that thesynthesized nanocomposite can be used effectively for the treatment of industrial wastewater in an efficient and economical manner.
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