研究生: |
陳婉君 Wan-jiun Chen |
---|---|
論文名稱: |
以熱沉積法摻雜氮在二氧化鈦之特性與光催化研究 Characterization and Photooxidation of N-doped Photocatalyst Prepared by Thermal Deposition |
指導教授: |
顧洋
Young Ku |
口試委員: |
蔣本基
Pen-Chi Chiang 曾迪華 Dyi-Hwa Tseng 劉志成 Jhy-Chern Liu 曾堯宣 Yao-Hsuan Tseng |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 化學工程系 Department of Chemical Engineering |
論文出版年: | 2008 |
畢業學年度: | 96 |
語文別: | 英文 |
論文頁數: | 125 |
中文關鍵詞: | 二氧化鈦 、BLED 、摻雜氮 、光觸媒催化 、摻雜 |
外文關鍵詞: | TiO2, BLED, nitrogen-doped, Photocatalysis, doping |
相關次數: | 點閱:289 下載:0 |
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中文摘要
本研究是將市售二氧化鈦光觸媒(P25)置於管狀高溫爐中,接著通入氨氣進行氮摻雜改質,分別改變不同鍛燒溫度以及氨氣流量作為探討因子,藉由讓O 2P軌域和N 2P軌域重疊以縮短能隙,使其光觸媒具有可見光光催化活性。並分別利用XRD、SEM、UV-vis DRS、BET、XPS以及Zata potential等儀器,對光觸媒特性做進一步的分析與探討。接著將製備出來的摻雜氮光觸媒,針對染料(甲基藍,Methylene Blue)進行光催化降解反應評估,針對不同變因進行探討,包括觸媒燒結溫度,不同光源以及溶液pH值等對觸媒活性的影響。
光觸媒材料經由UV-vis DRS鑑定分析發現,改質後的光觸媒能隙從3.2eV降至2.85eV,確實大幅提升可見光的吸收效率,XPS的定量和定性分析圖譜也分別顯示出N元素的存在。在光催化反應中,分別以BLED、GLED、UV-LED三種LED光源,進行甲基藍光催化降解,發現都具有可見光降解能力,去除率分別為68%、30%、98%。而以其甲基藍降解能力而言,在500℃下鍛燒出來的光觸媒具最佳催化能力,說明了氮的摻雜量並不是越多越好,而是存在一適當值,因為過多的摻雜反而會造成晶體結構的改變。在改變甲基藍水溶液的pH值研究發現,由於溶液不同pH值會造成溶液中的物種表面帶電性改變,不僅影響光觸媒本身對染料的吸附能力,也造成了不同的反應效率。其降解最佳值出現在pH 9.0。
Abstract
In this study, the nitrogen-doped TiO2 (P25) was prepared by annealing TiO2 under ammonia atmosphere at different temperature and for different ammonia gas flow rate in a tube furnace. Owing to the mixing of the band gap with O 2p and N 2p, the band gap was reduced and let the photocatalysts have visible light photodegradation activity. The characterizations of sample were estimated by XRD, SEM, BET, UV-vis DRS, XPS and Zeta potential. The photocatalytic activity of N-doped TiO2 was examined by decomposing of Methylene Blue with varying the calcinated temperature, different light sources and the solution pH.
From the UV-vis DRS analysis, the band gap was reduced from 3.2 eV to 2.85 eV before and after calcined the photocatalysts. The results shown the wavelengths red shifted to visible region. Moreover, the XPS spectrum of N-doped TiO2 showed the N peak obviously. In the photodegration reaction process of Methylene Blue, there were three kinds of the light be used as light sources, included BLED, GLED and UV-LED, the decomposition rate were 68%, 30% and 98%, respectively. According to the photocatalytic reaction results, the optimum temperature was annealed at 500℃. The result was shown that not the more nitrogen doping the more photocatalytic activity it have. The photocatalytic reaction was controlled strongly by pH because of the electrostatic force between the TiO2 particles and dye molecules. The optimum pH in the solution was pH 9.0.
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