Cc. Zhang et al., Synthesis and adsorption properties of magnetic resin microbeads with amine and mercaptan as chelating groups, J APPL POLY, 82(7), 2001, pp. 1587-1592
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.