Abstract:

The influence of ruthenium dioxide on the photoinduced electron transfer and  photocatalysis character for cadmium sulfide superfine particle system by means of ESR method. Results show that it is obviously different from the case of si ngle CdS colloid system, in the presence of ruthenium dioxide, CdS/RuO₂ binary system can ef fectly enhance photocatalysis reactions of some substrates; but for other substr ates, their interfacial photoreactions may be prohibited obviously or completely , namely, RuO\-2 plays  a role of  negative catalysis. Therefore, under different conditions, the promotion and negative catalysis characters of the CdS/RuO₂ binary system are conducive to control and regulation for the interfacial photoreaction processes.

Key words: Ruthenium dioxide, Cadmium sulfide, Electron transfer, Interfacial reaction, ESR, Negative catalysis