SYNTHESIS OF FUNCTIONAL RESINS FROM POLY(CHLOROMETHYL THIIRANE) AND THEIR SORPTION PROPERTIES FOR NOBLE-METAL

Three new kinds of functional resins bearing polythioether backbone an d primary amino group (CA), or dithiocarbamate (CDTC) or Shiff base (C SB) in side chain, were synthesized from poly-(chloromethyl thiirane). The sorption capacities of CA resins for noble metals were 5-8 mmol A u(III)/g resin and 7-9 mmol Ag+/g resin. CDTC resins could absorb 9-11 mmol Ag+ per gram resin, but little Au(III). CSB had similar properie s as CDTC. These resins all exhibited low capacities, no more than 2 m mol/g resin, for Hg2+, Pb2+, Ni2+, Fe3+, Zn2+, and Cu2+. Thus, Au(III) and Ag+ can be separated successfully from the above common ions. The resins were easily regenerated and reused without an obvious decrease in the sorption capacity for Ag+.