Removal of chromium(III) from aqueous solutions by adsorption on bentonite from Gaomiaozi, China.

The adsorption behaviors of Cr(III) from aqueous solution by Gaomiaozi (GMZ) bentonite were studied using equilibrium batch techniques. The effects of shaking time, pH value, adsorbent dose, ionic strength and temperature on adsorption capacity of GMZ bentonite were investigated. The optimum pH value was defined to be 7.0 at temperature 293.15 K. Kinetic and isotherm experiments were carried out at the optimum pH. It was enough to reach the adsorption equilibrium at 2 h and the maximum adsorption capacity was 4.68 mg/g under the given experimental conditions. The equilibrium data were fitted to pseudo-second-order kinetic equation. The Freundlich adsorption isotherm models were conducted for the description of the adsorption process. [ABSTRACT FROM AUTHOR]