Removal of chromium (VI) from aqueous solutions by hydrotalcite-like compounds: kinetic and equilibrium studies

Wastewaters containing chromium (VI) generated by different industrial processes are considered dangerous residues, since chromium (VI) is a powerful epithelial irritant and a human carcinogen. Thus, it is necessary to develop new materials that can be used in the remediation of contaminated water. In the present work hydrotalcite-like compounds with Mg/Al =2 were synthesized by the sol-gel method. The hydrotalcite-like compounds were characterized and used as sorbents for removal of chromium (VI) from aqueous solutions. The maximum chromium (VI) uptake by hydrotalcite-like compounds and its heated product were 100 and 125 mg of Cr (VI)/g, respectively.