Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 152, Issue 2, Pages 469-475Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2007.07.012
Keywords
heavy metals; removal; zirconium phosphate; hybrid sorbent; donnan membrane effect
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In the present study, a novel hybrid sorbent ZrP-001 was prepared by loading zirconium phosphate (ZrP) onto a strongly acidic cation exchanger D-001. Sorption behavior of Pb2+, Zn2+, and Cd2+ onto ZrP-001 was experimentally examined by comparing with the host exchanger D-001. ZrP-001 was characterized by scanning electron micrograph (SEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA), pH-titration and pore size distribution analysis. Sorption of the heavy metals onto ZrP-001 was found to be pH-dependent due to the ion exchange mechanism. Compared to D-001, a smaller pore size of ZrP-001 due to the ZrP dispersion consequently resulted in a lower sorption rate. Competitive effect of Ca2+ on sorption of heavy metals onto ZrP-001 and D-001 was compared to elucidate sorption preference of the hybrid sorbent towards heavy metals. More favorable sorption of ZrP-001 than D-001 was observed for all the three metals and their sorption preference onto ZrP-001 followed the order Pb2+ >> Zn2+ approximate to Cd2+. Fixed-bed sorption results and its efficient regeneration property further demonstrated that ZrP-001 is a potential candidate for removing heavy metals from contaminated water. (c) 2007 Elsevier B.V. All rights reserved.
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