Synthesis and adsorption properties of magnetic resin microbeads with amine and mercaptan as chelating groups

Three magnetic chelating resins containing amino and mercapto groups were p repared by the suspended condensation polymerization of 2-chloroethoxymethy l thiirane with diamines. The magnetic resins were microbeads whose diamete r was in the range of 10 to 45 mum. The structure of the resins was charact erized by XPS, IR, and elemental analysis. Their adsorption properties for Hg(II), Au(III), Pd(II), Pt(IV), Ag(I), Cu(II), Zn(II), and Pb(II) were inv estigated. The experimental results show the magnetic resins have high affi nity for Hg(II) and noble metal ions. In the competitive adsorption, the re sins predominantly adsorbed Hg(II) or Pd(II) in the coexistence of Cu(II), Zn(II), and Mg(II). Desorption of Pd(II) loaded on the resins was studied b y using 2M hydrochloric acid solution containing 1% thiourea as desorbent. A high desorption ratio (up to 96.5%) was observed, and repeated adsorption /desorption operations showed the probability of repeated use of the magnet ic resins. (C) 2001 John Wiley & Sons, Inc.