臺灣博碩士論文加值系統

摘要

二氧化鈦光觸媒具有光催化、無毒及化學穩定度高的特性，且是一種極為傑出的環保的光觸媒材料。

銀於文獻上的報載具有抑菌及殺菌的功能。本研究的目的在於使用銀修飾奈米二氧化鈦光觸媒，使其於可見光光譜有吸收峰。與其他文獻報載較不同處乃在於本研究利用Nd–YAG雷射為二氧化鈦光觸媒之激發源，並配合光降解實驗來探討銀修飾奈米二氧化鈦的結果。

由最後的結果得知以Nano Ag 2.0 wt % : TiO2 98.0 wt % 與 AgNO3 2.0 wt % : TiO2 98.0 wt % 之比例修飾奈米二氧化鈦光觸媒在可見光光譜區(380~780 nm)不僅有明顯的吸收峰，在光催化特性上亦明顯較未改質的奈米二氧化鈦光觸媒有較出色的表現。

Abstract

Titanium Dioxide photocatalyst has the characteristics of photo- catalysis, non toxicity and high stability of chemistry. It is also an outstanding photocatalyst material of environmental protection.

According to the literature, silver has the function of bacteriostasis and disinfection. Thus, the purpose of this study is to use silver to modify nanometer Titanium Dioxide photocatalyst and to make it reach a absorbing peak under visible light spectrum. This study is very different from the records of other literature because this study adopts Nd-YAG laser to be the energy of titanium dioxide photocatalyst and combine photodegradation experiment to investigate the result of nanometer Titanium Dioxide.

The results of the study showed that nanometer Titanium Dioxide photocatalyst, which is modified by the proportion of Nano Ag 2.0 wt % : TiO2 98.0 wt % and AgNO3 2.0 wt % : TiO2 98.0 wt %, has not only an obvious absorbing peak under visible light spectrum, but also a better result in photocatalysis compared with the original Titanium Dioxide photocatalyst.

目錄

中文摘要……………………………………………………I
英文摘要……………………………………………………II
目錄…………………………………………………………III
圖目錄………………………………………………………VI
表目錄………………………………………………………IX
第一章 緒論…………………………………………………1
1.1前言………………………………………………………1
1.2研究目的與內容…… …………………………………．3
第二章 理論與文獻回顧……………………………………5
2.1光觸媒簡介………………………………………………5
2.2二氧化鈦光觸媒…………………………………………7
2.2.1二氧化鈦的作用………………………………………9
2.2.2二氧化鈦的結構與特性………………………………9
2.2.3二氧化鈦的效果………………………………………12
2.3光觸媒反應機制…………………………………………12
2.4光催化性…………………………………………………15
2.5奈米粒子製備方法………………………………………17
2.6二氧化鈦光觸媒製備法…………………………………23
第三章 實驗…………………………………………………24
3.1實驗藥品…………………………………………………24
3.2實驗儀器…………………………………………………25
3.3光觸媒的特性分析………………………………………26
3.3.1紫外光-可見光光譜儀……………………………….26
3.3.2 X-ray繞射光譜儀……………………………………27
3.3.3穿透式電子顯微鏡……………………………………29
3.3.4掃描式電子顯微鏡……………………………………33
3.3.5 X射線能量散佈分析儀………………………………35
3.4實驗流程圖………………………………………………37
3.5實驗步驟…………………………………………………38
第四章 結果與討論…………………………………………42
4.1Ag修飾TiO2於可見光光譜之探討………………………42
4.2Ag修飾TiO2利用XRD於粉體結構之探討…………………44
4.3利用SEM/EDS觀察TiO2粉體粒徑大小及化學成份之探討50
4.4利用TEM觀察TiO2粉體表面型態之探討………………57
4.5光降解效率的探討……………………………………64
4.5.1 Nano Ag / TiO2對甲基藍降解的探討……………64
4.5.2 AgNO3 / TiO2對甲基藍降解的探討………………65
4.6 光降解背景實驗………………………………………67
4.6.1 甲基藍直接光降解實驗……………………………67
4.6.2 光觸媒吸附實驗……………………………………68
第五章 結論與展望………………………………………69
5.1結論……………………………………………………69
5.2未來展望………………………………………………70
參考文獻…………………………………………………．71
附錄…………………………………………………………75

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