ZHAO Feng-wei, SONG Han, SHANG Jing^*, WANG Qing

(State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China)

Abstract: Using copper phthalocyanine tetrasulfonic acid (CuPcTs)as photosensitizer, two sensitized films TiO₂-CuPcTs and ITO/ TiO₂-CuPcTs/ITO were prepared with glass and patterned indium tin oxide (ITO) as substrates, respectively. The photocatalytic properties of sensitized film were evaluated by photocatalytic degradation of RhB under visible light irradiation as the model reaction. The dye-sensitization films were characterized by ultraviolet-visible spectroscopy and Raman techniques. Based on structural characteristics of sensitized device, the photocurrent of sensitized device ITO/ TiO₂-CuPcTs/ITO in  atmosphere and pure water system were monitored. The results showed that, TiO₂-CuPcTs presented intensive absorption in visible-light region. The first-order reaction rate constant of TiO₂-CuPcTs film was 3.7-fold as blank TiO₂ film. TiO₂-CuPcTs film could function stably in the repeated photocatalytic degradations of RhB. ITO/ TiO₂-CuPcTs/ITO exhibited higher photocurrent than ITO/ TiO₂/ITO device, which confirmed the sensitization mechanism that the electrons can be transferred from excited CuPcTs to the conduction band of TiO₂.

Key words: TiO₂ film; Copper phthalocyanine tetrasulfonic acid; Dye sensitization; Visible-light photoelectrocatalysis

E-mail: shangjing@ pku. edu. cn

Journal of Molecular Catalysis, Vol. 24, Issue 4, 2010, 372~377