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.
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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).
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Wang, R., Lei, C., Wang, H. et al. Chelating properties of salicylhydroxamic acid-functionalized polystyrene resins and its application to efficient removal of heavy metal ions from aqueous solutions. Chem. Res. Chin. Univ. 31, 471–476 (2015). https://doi.org/10.1007/s40242-015-4476-9
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DOI: https://doi.org/10.1007/s40242-015-4476-9