Abstract
Chitosan-modified boehmite (AF-γ-AlOOH) was synthesized, characterized and used as adsorbent for removing vanadium and chromium from vanadium industrial wastewaters. Batch V(V) adsorption data showed that AF-γ-AlOOH possessed a V(V) adsorption capacity of 217 mg/g. The adsorption behavior followed the Langmuir isotherm model and pseudo second-order kinetics. The adsorption process was spontaneous and endothermic. Continuous fixed-bed column adsorption measurements showed that V(V) and Cr(VI) could be simultaneously decreased to less than the national emission standards (0.5 mg/L). The adsorbed AF-γ-AlOOH could be recycled by separating V(V) and Cr(VI). The XPS results indicated that the V(V) and Cr(VI) first interacted with functional groups such as –OH and –NH2 of AF-γ-AlOOH, and then was partially reduced to V(IV) and Cr(III), respectively. A whole process was proposed to realize separation and recovery of V(V) and Cr(VI) from the vanadium industrial wastewaters.
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