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 SnCI4 as the Lewis ac...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 SnCI4 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 se- lective 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.展开更多
基金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 Shan- xi Province, China（No.201504） and the Fund Program for the Scientific Activities of Selected Returned Overseas Professionals in Shanxi Province, China（No.20140828）.
文摘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 SnCI4 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 se- lective 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.
