四苯基卟啉锌/TiO2纳米复合材料的原位合成及可见光光催化

利用溶胶-凝胶法,经400℃(4 h)烧结后,原位合成不同摩尔比的5,10,15,20-四苯基卟啉锌(ZnTPP)/TiO2纳米复合材料,通过XRD,FTIR,UV-Vis,荧光光谱等表征分析,确认复合材料中TiO2为锐钛矿相,且ZnTPP在该过程中原位生成.经150 min可见光辐照,摩尔比为1:100的ZnTPP/TiO2复合材料能使罗丹明B溶液降解率达到92%.其光催化敏化的机理为,通过ZnTPP与TiO2之间的Zn-O键,使光生载流子形成有效的分离,提高了光催化性能.

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.