Removal of hexavalent chromium ions from aqueous solution by amidoxime functionalized wool fibers

摘要

Amidoxime functionalized wool fibers were used as the adsorbent for removal of hexavalent chromium (Cr(VI)) ions from aqueous solution. Effect of various process parameters like initial pH, contact time, initial Cr(VI) concentration, adsorbent dosage and temperature was investigated in batch experiment. The changes of the adsorbent during adsorption were determined by FT-IR and EDS-SEM. The results showed that the optimal pH for adsorption of Cr(VI) is at 3.0, the adsorption equilibrium would be achieved after 300 min. The adsorption capacity increases with the increasing of the initial concentration of Cr(VI). The adsorption process could be well described by pseudo-second-order kinetic model. The adsorption isotherm fitted well with the Langmuir model. Compared with the reported biomass adsorbents, the prepared Wool-g-AO showed excellent adsorption capacity for removal of Cr(VI) from aqueous solution.