Effective Removal of Chromium (VI) Ions from Tannery Effluent using Chitosan-Alumina Composite
Mrinal Kanti Kabiraz, Ismet Ara Jahan, Shah Md. Masum, Md. Monarul Islam, S. M. Mahmudul Hassan, Badhan Saha, Husna Purvin Nur
International Research Journal of Pure and Applied Chemistry · pp. 1–12 · Published 3 Nov 2015
10.9734/IRJPAC/2016/21856Abstract
A chitosan-alumina composite was prepared by coating chitosan, a glucosamine biopolymer, on activated alumina to remove chromium (VI) ion from tannery effluent. Chitosan was prepared from by demineralization and deproteinization of indigenous shrimp shell collected from Khulna, Bangladesh and was characterized using FTIR, X-Ray Diffraction (XRD) & Scanning Electron Microscopy (SEM). The composite was prepared by simple solution-evaporation method and was characterized using XRD & SEM. Batch isothermal equilibrium experiments were conducted to evaluate the biosorbent for the removal of hexavalent chromium (VI) from stock solution as well as effluent obtained from tanneries in local area. The optimum pH, dose, and contact time on adsorption was also investigated. Removal of Cr(VI) was found to be dependent on pH and maximum adsorption was observed at pH 2.0. The optimum dose and contact time for Cr(VI) treatment was 25 g/L and 240 minutes respectively. Experimental equilibrium data were fitted to Freundlich adsorption. The concentration of Cr(VI) was determined by Atomic Absorption Spectroscopy (AAS). The Cr(VI) removal efficiency of the prepared chitosan-alumina composite was 90.17% and for tannery effluent the Cr(VI) removal efficiency was found as 87.88% under the optimum conditions. Efficiency of Cr(VI) ions removal in terms of adsorption capacity was found to be in the order of chitosan-alumina composite>chitosan>alumina.
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