Synthesis of N doped TiO2 mesoporous spheres using different amine agents via microwave-assisted solvothermal method and their photocatalytic performances

• Main Authors: Lung-ShengJu, 朱容生
• Other Authors: Yu-Chun Wu
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/72162981075720499378

碩士 === 國立成功大學 === 資源工程學系碩博士班 === 101 === In this study, a novel and facile method is developed to synthesize N-TiO2 mesoporous microspheres via microwave-assisted solvothermal reaction route. Sol-gel process using titanium isopropoxide as precursors, hexadecylamine as structure-directing agent, and diethylenetriamine、diethylamine、dimethylamine、trimethylamine as amine agents, respectively. The size of the microsphere was ranging from 400 to 600 nm in anatase phase can be obtained using the current method under 190℃ in 1 hour. A shift of the absorption edge to a lower energy and a stronger absorption in the visible light region were observed. Both substitutional and interstitial nitrogen-doped titanium dioxides were prepared. Their surface states were clarified by XPS spectra. The nitrogen bonding form changed from different N/Ti ratio and different amine agents, and the specific surface area、photodegradation was different. The results of photodegradation or the organic pollutant rhodamine B in the visible light irradiation (420 nm) suggested that the TiO2 photocatalysts after nitrogen doping were greatly improved compared with Degussa P-25. The results showed that the photodegradatio, and the trimethylamine (N/Ti ratio =0.9)was obviously prior to others N-doped TiO2, because its interstitial is the height in N-doped TiO2 sample. Moreover, the visible light activity of interstitial N-doped TiO2 is higher than that of substitutional N-doped TiO2 .