Hydrophile Polymergele mit reaktiven Gruppen, 4. Mitt.: Chelatharze mit schwefelhaltigen Ankergruppen auf Basis von Saccharosemethacrylaten |
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Authors: | Heinrich Gruber |
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Institution: | (1) Institut für chemische Technologie organischer Stoffe, Technische Universität Wien, A-1060 Wien, Österreich |
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Abstract: | Chelating resins with thioglycolate anchor groups have been synthesized by reaction of sucrosemethacrylate gels with thioglycolic acid. The capacities of the gels were found to be extremely high for Ag+ (5,3 mmol/g) and Hg2+ (4,9 mmol/g). About 1 mmol Hg2+/g could be recovered from the gel reversibly by treatment with hydrochloric acid. The removal of Hg2+ from aqueous 3M alkalichloride solutions was possible with capacities of 1 mmol/g.Sucrosemethacrylate gels with primary aromatic amino group were reacted with CS2/NH3 to yield gels with dithiocarbamate groups. Gels with thiorea groups were prepared by reaction of the amino groups with NH4SCN/HCl. Diazotation of the amino groups, subsequent reaction with potassium xanthogenate and hydrolysis afforded gels with thiol groups. Thiol containing gels were synthesized also by reaction of the diazotised gels with Na2S2 and subsequent reduction with Na2S. Reaction of the diazotised gels with mercaptans yielded resins with thioether anchor groups. The capacities of the sulfur containing gels were found to be max. 4,1 mmol/g for Hg2+ and 5,9 mmol/g for Ag+. About 35% of the bonded Hg2+ could be eluted resersibly with 3N-HCl. |
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Keywords: | Gels with chelating anchor groups Gels with sulfur containing anchor groups Ion exchange Romoval of heavy metals |
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