Noble metal ion sorption by pyridyl and bipyridyl group-containing chelating polymers

A series of eighteen 4-vinylpyridine and 4-methyl-4'-vinylbipyridine copolymers with different crosslinkers was examined as sorbents for the noble metal ions of Ag(I), Au(III), Pd(II), and Pt(II) from aqueous solutions. The chelating polymers possess appreciable sorption selectivity for Au(III) over Ag(I) and for Pd(II) over Pt(II). Binding abilities of the copolymers toward the noble metal ions vary as the identity of the chelating heterocyclic amine moiety and the structure of the crosslinkers are altered. (C) 2001 John Wiley & Sons, Inc.