Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/5480
標題: 探討不同高壓氮氣鍛燒製備下二氧化鈦光觸媒特性之研究
Study on the characteristics of N-doped TiO2 photocatalysts produced by different pressure annealing
作者: 許元和
Hsu, Yuan-Ho
關鍵字: N-doped titanium dioxide;氮摻雜;photocatalyst;annealing pressure;2-propenol;二氧化鈦;鍛燒壓力;光觸媒;異丙醇
出版社: 環境工程學系所
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摘要: 
本研究利用大氣常壓電漿輔助奈米微粒製備程序(APPENS)搭配高壓鍛燒製備含氮摻雜奈米可見光觸媒,分析自製的含氮二氧化鈦光觸媒經高壓鍛燒程序下觸媒各項材料特性,探討利用自製可見光觸媒降解揮發性有機氣體異丙醇的效率。實驗結果顯示不同壓力(1~9 Bar)鍛燒,觸媒顆粒均勻且粒徑介於20 nm ~ 30 nm,UV-vis分析結果顯示鍛燒壓力有助於觸媒吸收光譜紅移,觸媒具有吸收可見光能力,相同鍛燒溫度300℃下鍛燒後的各觸媒經X光粉末繞射儀(XRPD)分析皆為銳鈦礦晶相,化學電子能譜分析儀(ESCA)分析結果顯示氮原子摻雜量未隨著鍛燒壓力提升而增加,摻雜的氮主要為吸附型的γ-N2,鍛燒程序的壓力也許有助於使氮原子與觸媒形成Ti-N鍵結型β-N,此外使用螢光分光光譜儀(PL)進行電子電洞對再結合率的測量,顯示壓力提升可以有效降低觸媒電子電洞對再結合率提升觸媒的活性。於光催化異丙醇實驗中,相同鍛燒溫度下鍛燒壓力提升有助於觸媒對異丙醇降解速率增加,以壓力5 Bar溫度500 ℃製備完成觸媒有最佳降解效果,其一階反應速率常數為0.76 hr-1,結果顯示氮摻雜二氧化鈦光觸媒在可見光下較未摻雜的二氧化鈦光觸媒有較佳的降解效果。

The nitrogen doped (N-doped) titanium dioxide (TiO2) photocatalyst was prepared by using the atmospheric-pressure plasma-enhanced nanoparticles synthesis process. In this study, we mainly investigated the characteristics of N-doped TiO2 produced under different annealed conditions and their efficiency on reducing 2-propenol. Synthesized catalysts were annealed in nitrogen which pressure varied from 1 to 9 bar. The results showed that the crystal phase of the catalysts were anatase phase as characterized by X-ray power diffraction (XRPD), and the scanning electron micrographs (SEM) revealed nanoparticle sizes ranging from 20 to 30 nm. The red-shift in UV-Vis absorption spectra enhanced with higher annealing pressure. Without annealing process data, obtained by using electron spectroscopy for chemical analysis (ESCA) exhibited chemadsorped γ-N2 type. However the annealing pressure might enhance the bounding of Ti-N since the spectrum of β-N type was observed for the samples annealed under high pressure, but there is no correlation between doped nitrogen concentration and the annealing pressure. Furthermore the analysis of photoluminescence indicated that the higher annealing pressure might reduce the hole-electron pair re-combnation. As a result, the reactivity of photocatalyst is better. Results also showed that the photocatalyst annealed under 500℃ and 5 bar achieved a better degradation efficience which first order reaction rate is 0.76 hr-1. In conclusion the N-doped TiO2 can achive a better degradation of 2-propenol as compared to those using pure TiO2 photocatalyst.
URI: http://hdl.handle.net/11455/5480
其他識別: U0005-2408200820464600
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