[Meso-tetraphenylporphyrinatozinc/TiO2 nanocompound synthesized by in-situ method and photocatalysis under visible-light irradiation].

The meso-tetraphenylporphyrinatozinc/titanium dioxide (ZnTPP/TiO2) nanocompounds with different molar ratios were synthesized by sol-gel method at 400 degrees C, 4h. The nanocompounds were characterized by XRD, UV-Vis, FTIR and Fluorescence methods. Anatase for TiO2 in the nanocompounds was defined, and ZnTPP was also obtained during in-situ process. Photocatalystic activities of them influenced by the proportion between ZnTPP and TiO2 were discussed under visible light. The results show that a nanocompound (ZnTPP:TiO2 = 1:100 mol%) has the best photocatalystic activity, and the degradation of Rhodanmine B is up to 92% after 150 minutes under visible light irradiation. The sensitization mechanism is that the photogenerated charge carriers are separated by Zn--O bond between ZnTPP and TiO2.