THIOUREA-BASED COORDINATING POLYMERS - SYNTHESIS AND BINDING TO NOBLE-METALS

The synthesis of several coordinating polymers by grafting thiourea fu nctional groups onto commercial macroporous polystyrene polymer matric es are described. In this paper, we also report the study on the absor ption and elution of precious metal ions (or together with base metal ions, Cu2+ and Fe3+) from acidic chloride solutions. The results showe d that these resins have appreciable capacity and good selectivity for the absorption of gold from acidic solutions. The extraction kinetics of the resins is slower than the corresponding monomolecular 'free' e xtractant analogues. However, some of the resins show acceptable extra ction rates.