Chelating Properties of Salicylhydroxamic Acid-functionalized Polystyrene Resins and Its Application to Efficient Removal of Heavy Metal Ions from Aqueous Solutions

doi:10.1007/s40242-015-4476-9

Chemical Research in Chinese Universities ›› 2015, Vol. 31 ›› Issue (3): 471-476.doi: 10.1007/s40242-015-4476-9

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Chelating Properties of Salicylhydroxamic Acid-functionalized Polystyrene Resins and Its Application to Efficient Removal of Heavy Metal Ions from Aqueous Solutions

WANG Ruixin, LEI Caiping, WANG Hongjing, SHI Xiaohui

School of Chemical and Environmental Engineering, North University of China, Taiyuan 030051, P. R. China

Received:2014-12-10 Revised:2015-02-15 Online:2015-06-01 Published:2015-03-16
Contact: WANG Ruixin E-mail:zbdxwrx@nuc.edu.cn
Supported by:
Supported by the National Young Scientists Fund of China(No.21307116), the Natural Science Foundation of Shanxi Province of China(No.2014011017-5), the Project for the Outstanding Innovative Teams of Higher Learning Institutions of Shanxi Province, China(No.201504) and the Fund Program for the Scientific Activities of Selected Returned Overseas Professionals in Shanxi Province, China(No.20140828).

Abstract

Abstract:

Salicylhydroxamic acid(SHA) was covalently bound onto crosslinked polystyrene spheres(CPSs) via the Friedel-Crafts alkylation reaction between chloromethylated CPSs and SHA in the presence of SnCl4 as the Lewis acid catalyst. The resulted SHA-CPSs possessed very strong chelating ability for heavy metal ions. In particular, the saturated adsorption amount of SHA-CPSs for Cu²⁺ ions could reach as high as 34.2 mg/g at 318 K. The chelating capability of SHA-CPSs towards heavy metal ions was pH and temperature dependent. SHA-CPSs also showed selective metal coordination with the chelating capacity decreasing in the order of Cu²⁺>Zn²⁺>>Pb²⁺. The adsorption isotherms conformed well to the Langmuir model, and the adsorption process was found to be entropy-driven and endothermic. Besides, SHA-CPSs possessed the excellent reusability.

Key words: Salicylhydroxamic acid, Crosslinked polystyrene sphere, Chelation adsorption, Entropy driving, Heavy metal ion

WANG Ruixin, LEI Caiping, WANG Hongjing, SHI Xiaohui. Chelating Properties of Salicylhydroxamic Acid-functionalized Polystyrene Resins and Its Application to Efficient Removal of Heavy Metal Ions from Aqueous Solutions[J]. Chemical Research in Chinese Universities, 2015, 31(3): 471-476.

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Chelating Properties of Salicylhydroxamic Acid-functionalized Polystyrene Resins and Its Application to Efficient Removal of Heavy Metal Ions from Aqueous Solutions

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