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Removal of the heavy metal ion chromiuim(VI) using Chitosan and Alginate nanocomposites

Gokila, S., Gomathi, T., Sudha, P.N., Anil, Sukumaran
International journal of biological macromolecules 2017 v.104 pp. 1459-1468
Fourier transform infrared spectroscopy, X-ray diffraction, adsorbents, adsorption, agitation, alginates, biosorbents, chitosan, chromium, heavy metals, models, nanocomposites, pH, reaction kinetics, scanning electron microscopy, sorption isotherms, wastewater, wastewater treatment, water pollution
Removal of heavy metals from wastewater is essential to avoid water pollution. In the present study, the performance of Chitosan and Alginate nanocomposites was evaluated for the removal of chromium (VI) from water waste. The physicochemically characterized (FT-IR, XRD, SEM, DSC, and DLS) for wastewater treatment were studied. Batch adsorption experiments were performed to examine the removal process under various factors like the effects of initial concentration, adsorbent dose, pH, and agitation time. The metal ion removal was pH dependent and reached optimum at pH 5.0. Experimental data were analyzed by Langmuir and Freundlich adsorption isotherms. The isotherm study revealed that the adsorption equilibrium is well-fitted to the Freundlich isotherm and the sorption capacity of Chitosan and Alginate nanocomposites is very high, and the adsorbent favors multilayer adsorption. Pseudo-first- and −second-order kinetics models were used for describing kinetic data. It was determined that removal of Cr (VI) be well-fitted by second-order reaction kinetics. From the results, it was concluded that Chitosan and Alginate Nanocomposites is an excellent material as a biosorbent for Cr(VI) from water waste.