Preparation and Properties of Macroreticular Chelating Resins Containing Amidoxime Groups from Styrene(Divinyl-type Compound) Copolymer B eadst

Abstract

Macroreticular chelating resins containing amidoxime groups were prepared from styrene(divinyl-type compound) copolymer beads. Divinylbenzene and ethylene dimethacrylate were used as divinylmonomer. The chelating resins (RSNH and RSGNH) with various pore structures were prepared by changing the monomer ratio of each monomer in feed and the amount of diluent. The adsorption ability of the resins for Ag+, Cu2+, and UO22+ was investigated. The adsorption of CO+ and UO22+ was greatly affected by the pore structure of the resins. The good chelating resin (RSNH) was prepared from the macroreticular copolymer which was obtained by suspension polymerization of styrene (83 mol%), divinylbenzene (10 mole%), and ethylvinylbenzene (7 mole%), in the presence of 2, 2, 4-trimethylpentane (100 volume% per the monomer mixture) as diluent. The decreasing order of adsorption rate of RSNH for Ag+, Cu2+, and UO22+ is as follows: Ag+ >Cu2+ >UO22+. It was also found that RSNH had a high acid-resistance. The adsorption rate of the resins (RSGNH) with ethylene dimethacrylate as hydrophilic crosslinking reagent for metal ions was faster than that of the resins (RSNH) prepared from styrene-divinylbenzene copolymer beads.