Inter-Particle Electron Transfer in Semiconductor Dispersions: A New Strategy in Photocatalysis

摘要: The photodegradation of H2S in alkaline aqueous media is mediated by CdS under visible light excitation to give H2 and S. new strategy coupling with another semiconductor (TiO2 or TiO2/redox catalyst), as well a redox catalyst deposited on an ‘inert’ support has been used. results suggest inter-particle electron transfer takes place from the conduction band that TiO2effecting irreversible charge separation: e cb − TiO2 h vb + CdS. Photoelectrochemical experiments (rotating graphite electrode) nearly identical conditions those used photocatalysis work, sulfite ions present, vectorial displacement electrons illuminated then electrode. Further evidence for presented photoconductivity measurements carried out vacuo TiO2, CdS, CdS/TiO2 CdS/SiO2 mixtures, double pellet. Under these conditions, also occurs, but However, two are not inconsistent one another, view different treatments materials experimental That does occur inescapable. worth further exploration improve photocatalytic efficiencies.