This articles provided information on Cr(VI) adsorption onto protonated crosslinked chitosan particles (PCPs) as an adsorbent. Batch experiments were performed to investigate the effects of the adsorbent dosage, pH, contact time, initial Cr(VI) concentration, and coexisting ions on the adsorption capacity and the regeneration ability of the adsorbent. The equilibrium data fit well with the Freundlich and RedlichPeterson isotherm models. The presence of other anions weakened Cr(VI) adsorption, especially high-valence anion such as sulfate. PCP could be regenerated well by a 0.1N sodium hydroxide solution. Electrostatic attraction was the main driving force for Cr(VI) adsorption. (c) 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 129: 908-915, 2013