Study on adsorption behavior of crosslinked cationic starch maleate for chromium(VI)

Crosslinked cationic starch maleates (CCSM) containing quaternary ammonium cationic groups were prepared by a dry reaction. The adsorption behavior of crosslinked cationic starch maleates for Cr(VI) was investigated. Physicochemical factors such as equilibrium time, temperature, and initial solution pH affecting magnitude of Cr(VI) adsorption were studied. Their adsorption behavior was found to follow langmuir isotherm. The adsorption capacity decreased with increasing DS of anionic maleic groups. The thermodynamic investigation demonstrated that the adsorption process was exothermic, and thermodynamic parameters were calculated at different DS. (c) 2006 Elsevier Ltd. All rights reserved.