Abstract: Dye-sensitized TiO₂ photocatalysts using perylene diimide( ab. TiO₂ /PTCDI ) and co-sensitized using Perylenediimide( PTCDI) and copper phthalocyanine ( CuPc) ( ab. ( TiO₂ / PTCDI) -CuPc) as sensitizing compound were prepared by hydrothermal method. The crystalline structure and surface properties of the samples were characterized by XRD, TEM and UV-Vis spectra. The photocatalytic degradation of RhB under visible light illumination was used as the model reaction to investigate the photocatalytic activities of dye-sensitized TiO2 samples. The results show that the photocatalytic activity of co-sensitized photocatalyst ( TiO₂ / PTCDI) -CuPc was higher than that of TiO₂ and TiO₂ / PTCDI, by the extent of 223% and 113% , respectively. According to the band theory, the electron transfer processes and photocatalytic degradation mechanism of TiO₂ /PTCDI and ( TiO₂ / PTCDI) -CuPc were explained.

Key words: perylene diimide, copper phthalocyanine, dye sensitization, visible-light photocatalysis, rhodamine B

摘要： 采用水热法制备了?二酰亚胺(PTCDI) 敏化的光催化剂 TiO₂/ PTCDI 以及 PTCDI 和酞菁铜( CuPc) 共敏化的可见光光催化剂(TiO₂/ PTCDI) -CuPc。利用 XRD, TEM 和 UV-Vis 光谱对催化剂进行表面形貌和结构表征。以罗丹明 B 的光催化降解为模型反应, 考察敏化样品的可见光光催化性能。研究表 明染料共敏化样品( TiO₂ / PTCDI) - CuPc 的活性比TiO₂和 TiO₂ / PTCDI 分别提高了223% 和 113% 。应用能带结构理论, 阐明了TiO₂ / PTCDI 和( TiO₂ / PTCDI) -CuPc 的光生电子转移路径和光催化降解机理。

关键词: ?二酰亚胺, 酞菁铜, 染料敏化, 可见光光催化, 罗丹明B