Journal
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
Volume 31, Issue 3, Pages 471-476Publisher
HIGHER EDUCATION PRESS
DOI: 10.1007/s40242-015-4476-9
Keywords
Salicylhydroxamic acid; Crosslinked polystyrene sphere; Chelation adsorption; Entropy driving; Heavy metal ion
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Funding
- National Young Scientists Fund of China [21307116]
- Natural Science Foundation of Shanxi Province of China [2014011017-5]
- Project for the Outstanding Innovative Teams of Higher Learning Institutions of Shanxi Province, China [201504]
- Fund Program for the Scientific Activities of Selected Returned Overseas Professionals in Shanxi Province, China [20140828]
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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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