Journal of Industrial and Engineering Chemistry, Vol.60, 485-492, April, 2018
Facile synthesis and characterization of γ-AlOOH/PVA composite granules for Cr(VI) adsorption
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γ-AlOOH(boehmite)/PVA composite granules with high adsorption performance towards Cr(VI) were successfully synthesized by combining sol.gel and oil-drop methods. The γ-AlOOH/PVA sample with 35 wt% PVA showed the highest Cr(IV) adsorption capacity of 35.91 mg/g, which was much higher than that of the pure γ-AlOOH sample (17.08 mg/g). The adsorption behaviors of Cr(VI) ions onto the γ-AlOOH and γ-AlOOH/PVA granules were well described by the pseudo-second-order kinetic model, and the adsorption mechanisms included electrostatic attraction, ligand exchange and redox reaction. The recovery of Cr(VI) under basic conditions was conducted to evaluate the practical utility of the synthesized composite granules.
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