Preparation and Photocatalytic Properties of Composite CdS Nanoparticles–Titanium Dioxide Particles

CdS nanoparticles surface-capped by mercaptoacetic acid (MAA) were immobilized onto TiO2 (anatase) particles. The resulting composite particles, CdS–MAA–TiO2, were then used as a photocatalyst for the generation of H2 from 2-propanol aqueous solution, under visible light irradiation conditions (λ>400 nm). A remarkably enhanced photocatalytic activity for H2 generation from 2-propanol aqueous solution was observed for the CdS–MAA–TiO2 (anatase) system, as compared with that for CdS–MAA; the activity being effected by transfer of the conduction band electrons, photogenerated in CdS, to the conduction band of TiO2, where H2 generation occurs.

[1]  Louis E. Brus,et al.  Electron-electron and electron-hole interactions in small semiconductor crystallites : The size dependence of the lowest excited electronic state , 1984 .

[2]  A. Henglein,et al.  Photochemistry of semiconductor colloids. 22. Electron ejection from illuminated cadmium sulfide into attached titanium and zinc oxide particles , 1987 .

[3]  N. Serpone,et al.  Utilization of the Semiconductor Particle as a Microphotoelectrochemical Cell Electrochemical Evidence for Interparticle Electron Transfer and Application to Photocatalysis , 1988 .

[4]  P. Kamat,et al.  Photophysical and photochemical aspects of coupled semiconductors: charge-transfer processes in colloidal cadmium sulfide-titania and cadmium sulfide-silver(I) iodide systems , 1990 .

[5]  A. Alivisatos,et al.  Semiconductor nanocrystals covalently bound to metal surfaces with self-assembled monolayers , 1992 .

[6]  T. Hirai,et al.  Preparation of Metal Sulfide Composite Ultrafine Particles in Reverse Micellar Systems and Their Photocatalytic Property , 1994 .

[7]  H. Matsumoto,et al.  Size Dependent Fluorescence Quenching of CdS Nanocrystals Caused by TiO2 Colloids as a Potential-Variable Quencher , 1995 .

[8]  D. Meisel,et al.  BIFUNCTIONAL CAPPING OF CDS NANOPARTICLES AND BRIDGING TO TIO2 , 1995 .

[9]  T. Hirai,et al.  Preparation of Cadmium Sulfide Ultrafine Particles Surface-Modified with Thiols in Reverse Micellar Systems and Redispersion in Non-Micellar Solvents , 1997 .

[10]  Encai Hao,et al.  Assembly of alternating TiO2/v\CdS nanoparticle composite films , 1998 .

[11]  T. Hirai,et al.  Composite nano-CdS-polyurethane transparent films , 1999 .