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Adsorption of Chromium(VI) on Mesoporous Alumina
Authors: Ryo Yoshimitsu, Syouhei Nishihama and Kazuharu Yoshizuka
Affiliation: Department of Chemical Engineering, Faculty of Environmental Engineering, The University of Kitakyushu, Japan
Published in: Ion Exch. Lett. 2016, 9(1-4), 1-5
Permanent link to this page: http://iel.vscht.cz/abstracts/1803-4039-09-0001.htm
Keywords: adsorption; chromium(VI); mesoporous alumina
Abstract: Adsorption of Cr(VI) was investigated, employing mesoporous alumina (MA) as an adsorbent. The MA of γ-structure, having narrow pore size distribution of around 5.2 nm, was synthesized by hydrothermal synthesis method. The isoelectric point of the MA was pH = 7.2. The MA could thus adsorb anionic species of Cr(VI), Cr2O22- , and HCrO4- , in aqueous solution at acidic pH region. The adsorption of Cr(VI) at pH < 4.2 was decreased due to dissolution of the MA. The adsorption of Cr(VI) with MA is progressed by Langmuir mechanism with the maximum adsorption amount of 0.599 mmol/g and adsorption constant of 8.93 L/mmol at equilibrium pH = 4.51. Effective elution of the Cr(VI) loaded on the MA was achieved by weak alkaline solution of pH ≈ 9.