CADMIUM-SULFIDE WITH IRIDIUM SULFIDE AND PLATINUM SULFIDE DEPOSITS ASA PHOTOCATALYST FOR THE DECOMPOSITION OF AQUEOUS SULFIDE

The in situ deposition of Pt and Ir on CdS during the photocatalytic d ecomposition of aqueous sulfide results in the formation of an effecti ve bifunctional photocatalyst (MS/CdS/M, where MS is Pt or Ir sulfide and M is Pt or Ir) which is more active than CdS and metallized CdS. I n situ metallization provides a convenient method for the preparation of metal- and metal-sulfide-deposited CdS. The order of reactivity for the in situ metallization of CdS in the case of the photocatalytic de composition of aqueous sulfide is Ph > Pt > Pd > Ru = Ir > Co approxim ate to Ni = Fe. Based on the observed results a mechanism for the phot ocatalytic decomposition of aqueous sulfide is proposed.