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We synthesized Fe-coated vermiculite (Fe-CV) for the removal of Cr(VI) and investigated the mechanism of Cr(VI) adsorption onto Fe-CV. Fe-CV was synthesized at different Fe molar concentration to vermiculite ratio, i.e., 1, 2, 5, 8, 10 mol-Fe/kg. Fe-CV synthesized at 8 mol-Fe/kg was found to be most effective for the removal of Cr(VI) and further experiments were performed under batch condition using the Fe-CV. Kinetic sorption test and model analysis showed that observed data were well suited to pseudo second-order model, indicating that chemisorption dominates the process of Cr(VI) adsorption to Fe-CV. Equilibrium test demonstrated that Freundlich model well describes Cr(VI) adsorption to Fe-CV and the maximum Cr(VI) adsorption capacity of Fe-CV was 6.86 mg/g. Cr(VI) removal was the highest at pH 2 and decreased with increasing pH due to electrostatic repulsion between Cr(VI) and Fe-CV at higher pH. The effect of competing anions on Cr(VI) adsorption follows the order: PO43- > CO32- > SO42- > NO3-. The removal percentage of Cr(VI) was increased but the adsorbed amount of Cr(VI) per unit mass of Fe-CV was decreased as the increase of the dosage amount of Fe-CV. Finally, Fe-CV is an effective adsorbent for the removal of Cr(VI) and the results of this study are helpful for understanding the mechanism of Cr(VI) removal by Fe-CV.
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참고문헌 (41)
참고문헌 신청
Richard, F.C. / 1991 / Aqueous geochemistry of chromium : A review / Water Research 25(7):807~816
Mohan, Dinesh / 2006 / Activated carbons and low cost adsorbents for remediation of tri-and hexavalent chromium from water / Journal of Hazardous Materials 137:762~811
Miretzky, M. / 2010 / Cr(VI)and Cr(III) removal from aqueous solution by raw and modified lignocellulosic materials: A review / Journal of Hazardous Materials 180(1-3):1~19
Bajda, T. / 2013 / Adsorption of chromate from aqueous solutions by HDTMA-modified clinoptilolite, glauconite and montmorillonite / Applied Clay Science 86:169~173
Krishnani, K.K. / 2006 / Heavy metals remediation of water using plants and lignocellulosic agrowastes / Reviews of Environmental Contamination and Toxicology 188:59~84
Mohan, Dinesh / 2006 / Activated carbons and low cost adsorbents for remediation of tri-and hexavalent chromium from water / Journal of Hazardous Materials 137:762~811
Miretzky, M. / 2010 / Cr(VI)and Cr(III) removal from aqueous solution by raw and modified lignocellulosic materials: A review / Journal of Hazardous Materials 180(1-3):1~19
Bajda, T. / 2013 / Adsorption of chromate from aqueous solutions by HDTMA-modified clinoptilolite, glauconite and montmorillonite / Applied Clay Science 86:169~173
Krishnani, K.K. / 2006 / Heavy metals remediation of water using plants and lignocellulosic agrowastes / Reviews of Environmental Contamination and Toxicology 188:59~84
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