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Student Number 92324020
Author Shih-Yung Yeh(葉世墉)
Author's Email Address 92324020@cc.ncu.edu.tw
Statistics This thesis had been viewed 3199 times. Download 4334 times.
Department Chemical and Materials Engineering
Year 2004
Semester 2
Degree Master
Type of Document Master's Thesis
Language zh-TW.Big5 Chinese
Title 二氧化鈦的合成與光催化性質的研究
Date of Defense 2005-06-21
Page Count 103
Keyword
  • 二氧化鈦
  • 光催化反應
  • Abstract Abstract
    Titanium oxide is a semi-conducting photocatalyst. It can decompose the organic pollutants by irradiation under UV light. This study is divided into chiefly two parts: the first part is the syntheses of TiO2 by modified sol-gel method using titanium n-butoxide as Ti-precursor. Different synthetic procedures and calcination temperatures lead to different crystallinity, crystal sizes and crystal forms of TiO2. Photo-decomposition of salicylic acid under irradiation of UV light (350 nm) was studied. In the second part, visible light active photocatalysts were prepared by incorporation of transition metal ions (Cr3+, Fe3+ and V4+) and doping nitrogen. Photo-decomposition of salicylic acid under irradiation of visible light (470 nm) was studied.
    High UV light photocatalytic activities were obtained with catalysts of highly crystalline anatase phase after calcinations at high temperature. But the activities decrease when mixing phases of anatase and rutile are obtained. The photo-decomposition activity of Cr3+ and Fe3+ modified TiO2 are higher than V4+ modified TiO2. The photo-decomposition activity of transition metal ions modified TiO2 are all higher than P-25 in visible region. The photo-decomposition activity of TiO2 (AMT-100) after heat treatment under ammonia atmosphere at 400 ℃ is the best. Either transition metal ions incorporation or nitrogen doped TiO2 cause defects in TiO2 crystal. The electron-hole recombination at defect sites induces decay of photo-decomposition activity.
    Table of Content 目錄
    中文摘要Ⅰ
    英文摘要Ⅱ
    圖目錄Ⅴ
    表目錄Ⅷ
    第一章緒論1
    第二章文獻回顧3
    2-1 二氧化鈦基本性質3
    2-2 二氧化鈦的合成方法6
    2-2-1 溶膠凝膠法6
    2-2-2 熱水解法8
    2-2-3 水熱法8
    2-2-4 微乳膠法9
    2-3 光催化反應原理11
    2-4 影響二氧化鈦光催化速率之因素14
    2-4-1 反應物之濃度14
    2-4-2 氧氣與水氣之效應15
    2-4-3 入射光之強度16
    2-4-4 pH值之效應17
    2-5 二氧化鈦光催化之改進18
    2-5-1 摻入氧化物18
    2-5-2 二氧化鈦之金屬原子負載19
    2-5-3 二氧化鈦吸收可見光能力之提升20
    第三章實驗方法34
    3-1 實驗藥品34
    3-2 實驗儀器35
    3-3 二氧化鈦觸媒之合成36
    3-3-1 TiO2-A之製備37
    3-3-2 TiO2-B之製備37
    3-3-3 TiO2-C之製備37
    3-4 具可見光應答之二氧化鈦製備41
    3-4-1 Cr, Fe, V- TiO2之製備41
    3-4-2 TiO2-NH3之二氧化鈦製備41
    3-5 物性分析44
    3-5-1 粉末X光繞射(XRD) 44
    3-5-2 反射式紫外-可見光光譜儀(UV-VIS Spectropotometer) 45
    3-5-3 氮氣吸附-脫附測定比表面積46
    3-5-4 X射線光電子光譜儀(X-Ray Photoelectron Spectroscopy, XPS) 47
    3-5-5 穿透式電子顯微鏡(Transmission Electron Microscope, TEM) 47
    3-6 光催化活性測試48
    第四章結果與討論52
    4-1 二氧化鈦之物性分析52
    4-1-1 粉末X光繞射儀分析53
    4-1-2 反射式UV-VIS吸收光譜分析62
    4-1-3 比表面積分析66
    4-1-4 XPS表面分析69
    4-1-5 穿透式電子顯微鏡分析75
    4-2 光催化反應活性測試80
    4-2-1 背景實驗80
    4-2-2 二氧化鈦之光催化反應82
    4-2-3 改質後二氧化鈦之光催化反應86
    第五章結論92
    參考文獻94
    附錄100
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    Date of Submission 2005-07-12

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