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- W2060698565 abstract "Macroreticular copolymer beads were prepared by suspension polymerization of 4-vinylbenzyl chloride (VBC), divinylbenzene (DVB) and monomers with carboxylic ester groups like dibutyl maleate (DBM), dibutyl fumarate (DBF) and dibutyl itaconate (DBI) in the presence of toluene as diluent. The copolymer beads were phosphorylated at the chloromethylated phenyl rings with triethyl phosphite and hydrolyzed by an aqueous sodium hydroxide solution; the hydrolysis on the bead surface converted carboxylic ester/phosphonate groups into carboxylic acid/phosphono groups, respectively. The investigations on the metal ion chelation characteristics of the H-form copolymer beads revealed that they have good adsorptivity toward heavy metal ions like Pb2+, Cd2+ and Cu2+, and poor adsorptivity toward ions like Hg2+ and UO22+. The adsorptivity caused by the three carboxylic ester monomer derivatives was in the order DBM > DBI > DBF. Especially, the Na-form copolymer beads neutralized by alkali treatment were very available for the adsorption of all the metal ions under investigation. Makroretikulare Copolymerperlen wurden durch Suspensionspolymerisation von 4-Vinylbenzylchlorid (VBC), Divinylbenzol (DVB) und mehreren Monomeren mit Carboxylestergruppen wie Dibutylmaleat (DBM), Dibutylfumarat (DBF) und Dibutylitaconat (DBI) in Toluol hergestellt. Die Copolymerperlen wurden an den chlormethylierten Phenylringen mit Triethylphosphit phosphoryliert und mit wäßriger Natriumhydroxid-Lösung hydrolysiert; durch die Hydrolyse auf der Oberfläche der Perlen wurden Carboxylat- bzw. Phosphonatgruppen in Carboxylsäure- bzw. Phosphonogruppen umgewandelt. Die Copolymerperlen in der H-Form zeigten gute Adsorptionsfähigkeit gegenüber Schwermetallionen wie Pb2+, Cd2+ und Cu2+ und schlechte Adsorptionsfähigkeit gegenüber Ionen wie Hg2+ und UO22+. Die Adsorptionsfähigkeit der drei Monomerderivate mit Carboxylestergruppen verläuft in der Reihe DBM > DBI > DBF. Besonders die durch alkalische Behandlung neutralisierten Copolymerperlen in der Na-Form waren sehr gut für die Adsorption aller untersuchten Metallionen geeignet." @default.
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- W2060698565 date "1999-06-01" @default.
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- W2060698565 title "Synthesis and heavy metal ion adsorptivity of macroreticular chelating resins containing phosphono and carboxylic acid groups" @default.
- W2060698565 doi "https://doi.org/10.1002/(sici)1522-9505(19990601)267:1<27::aid-apmc27>3.0.co;2-z" @default.
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