Study of visible-light photocatalytic TiO2 powder prepared by flat flame method

• Main Authors: Guo-Yong Jhan, 詹國詠
• Other Authors: Yi-Chia Chen
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/qt2umk

碩士 === 國立東華大學 === 材料科學與工程學系 === 96 === Visible-light-photocatalytic TiO2 powder could be synthesized successfully by flat-flame metal organic chemical vapor deposition system. In this study, the ratio of acetylene to oxygen and the flow rate of carrier gas (Ar) were changed to investigate the photocatalytic properties under visible light. Experimental results show that yellowish TiO2 powder with the best photocatalytic performance could be synthesized under high ratio of acetylene to oxygen (600 sccm to 3600sccm) and low carrier gas flow rate (100sccm). XPS and EPR results reveal that the outstanding visible- light photocatalytic properties of TiO2 is due to the C doping in the TiO2 powder. C doping in the TiO2 powder induces the formation of defect level in the band gap and reduces the energy need to excite the electron-hole pair. In other words, electron-hole pair could be generated through visible light absorption which improves the photocatalytic activity.