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Sowmya, A., D. Das, S. Prabhakar, M.M. Kumar, K. Anbalagan, and M. Rajesh
Environmental Process & Sustainable Energy [Published online 23 July 2019 prior to print]

In this study, perchlorate was efficiently removed from water using quaternary ammonium-functionalized cross-linked chitosan beads (QACB). This synthesized bead was found to be efficient in terms of perchlorate removal capacity, 100% regeneration of used beads (using HCl or NaCl), and selectivity in the presence of coanions, namely, chloride, sulfate, carbonate, and nitrate. QACB removes perchlorate by the exchange of chloride ions. QACB was able to remove >95% perchlorate from brackish water. Batch studies were conducted to optimize the condition for maximum perchlorate removal. The perchlorate removal capacity of QACB from 1,000 mg/L aqueous solutions was 153 mg/g. The outcome of pH variation studies indicated that QACBs can remove perchlorate in pH ranges of 2-11. Equilibrium isotherm data of adsorption of perchlorate at temperature 303, 313, and 323 K were well fitted to the linear Freundlich, Langmuir, and Dubinin-Radushkevich isotherm models. The adsorption kinetics data were best described by the pseudo-second-order kinetic model. FTIR was used to confirm the interaction of perchlorate with QACB.

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