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The possible use of activated carbon (COASAC) prepared from camellia oleifera abel shells (COAS) by phosphoric acid activation as a biosorbent in the removal of Cr from aqueous solution was demonstrated. The effect of different parameters such as initial concentration of Cr , dose of adsorbent, pH and temperature on Cr adsorption were investigated. The results showed that the maximum uptake of Cr was up to 165.0 mg/g at pH of around 2.0, under the initial Cr concentration of 250 mg/L and the temperature of 293K. The adsorption kinetics was found to follow a pseudo-second order kinetic model. The extent of the Cr removal increased with increasing initial Cr concentration and the equilibrium data fitted well to the Freundlich model.

Removal of Cr ( ) from aqueous solution using Camellia oleifera abel shell-based activated carbon