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Preparation of a heterogeneous hollow‐fiber affinity membrane having a mercapto chelating resin and its recovery of Hg 2+ cations
Author(s) -
Wang Bing,
Liu Wei,
Huang Lei
Publication year - 2007
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.27137
Subject(s) - chelation , membrane , adsorption , hollow fiber membrane , fiber , chemistry , nuclear chemistry , chromatography , inorganic chemistry , organic chemistry , biochemistry
A kind of heterogeneous hollow‐fiber affinity filter membrane with a high chelating capacity for Hg 2+ was prepared by phase separation with blends of a mercapto chelating resin and polysulfone as the membrane materials, N,N ‐dimethylacetamide as the solvent, and water as the extraction solvent. The adsorption isotherms of the hollow‐fiber affinity filter membrane for Hg 2+ were determined. The heterogeneous hollow‐fiber affinity filter membrane was used for the adsorption of Hg 2+ cations through the coordination of the mercapto group and Hg 2+ cations, and the effects of the morphology and structure of the affinity membrane on the chelating properties were investigated. The chelating conditions, including the chelating resin grain size, pH value, concentration of the metallic ion solution, mobile phase conditions, and operating parameters, had significant effects on the chelating capacity of the hollow‐fiber affinity filter membrane. The results revealed that the greatest chelating capacity of the hollow‐fiber affinity filter membrane for Hg 2+ was 1090 μg/cm 2 of membrane under appropriate conditions, and the adsorption isotherms of Hg 2+ could be described by the Langmuir isotherm. The dynamic chelating experiments indicated that the hollow‐fiber affinity membrane could be operated at a high feed flow rate and that large‐scale removal of Hg 2+ could be realized. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008