title: A comparative study on Pb2+, Zn2+ and Cd2+ sorption onto zirconium phosphate supported by a cation exchanger.
abstract: 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 Pb(2+), Zn(2+), and Cd(2+) 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 Ca(2+) 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 Pb(2+)>>Zn(2+) approximately Cd(2+). 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.
authors: State Key Laboratory of Pollution Control and Resource Reuse, Nanjing University, Nanjing 210093, People's Republic of China.
authors: Q R
authors: QR
authors: Zhang
authors: W
authors: W
authors: Du
authors: B C
authors: BC
authors: Pan
authors: B J
authors: BJ
authors: Pan
authors: W M
authors: WM
authors: Zhang
authors: Q J
authors: QJ
authors: Zhang
authors: Z W
authors: ZW
authors: Xu
authors: Q X
authors: QX
authors: Zhang
mesh_terms: D000327:Adsorption; D002104:Cadmium / Q000302:isolation & purification*; D002118:Calcium / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007854:Lead / Q000302:isolation & purification*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D015032:Zinc / Q000302:isolation & purification*
chemical_list: D014874:Water Pollutants, Chemical; D002104:Cadmium; D007854:Lead; D015032:Zinc; D002118:Calcium