博碩士論文 100326014 詳細資訊




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姓名 陳凱欣(Kai-shen Chen)  查詢紙本館藏   畢業系所 環境工程研究所
論文名稱 以溶膠凝膠法製備MWCNTs/TiO2及其光催化特性
(Photocatalytic activity of multi - walled carbon nanotube supported TiO2 photocatalyst by sol-gel method)
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摘要(中) 本研究利用溶膠凝膠法(sol-gel),以MWCNTs為載體,透過有機前驅物鈦酸四乙酯(TEOT),製備MWCNTs/TiO2奈米光複合觸媒,光催化降解水楊酸之影響。研究係於批次式光催化反應器中進行,測試不同的製備條件如MWCNTs:TiO2之觸媒配比、鍛燒溫度及不同光源對水楊酸光催化降解能力。透過FT-IR圖譜可得知,改質後之MWCNTs表面可增加含氧官能基,而FE-SEM、TEM影像顯示,MWCNTs分散性良好,提高碳管純度,以及表面的破壞所形成缺陷位址有助於TiO2合成。
研究結果顯示,碳管添加量為5 wt%之MWCNTs/TiO2複合材料,於UV光下光催化降解水楊酸效果最佳,可能因碳管吸附之濃縮作用,以及光催化時有助於預防TiO2電子-電洞對再結合,透過協同作用增加TiO2光催化能力,但添加過多的奈米碳管時,會因碳管吸收光源,導致溶液中的MWCNTs/TiO2複合光觸媒之催化能力下降。鍛燒溫度方面,隨著溫度越高,TiO2顆粒燒結團聚現象嚴重,會導致光催化能力下降。透過Langmuir -Hinshelwood反應動力模式進行擬合,MWCNTs/TiO2複合材料光觸媒在UV光下進行光催化,其光源波長較短,觸媒上的電子較易被激發使得催化能力較強,反應碰撞較為激烈,較符合擬二階反應動力模式。
摘要(英) In this study, MWCNTs/TiO2 composites were prepared using multi- walled carbon nanotubes as a starting material, and titanium ethoxide as the precursor of TiO2. This process involves the hydrolysis and polycondensation of a precursor and subsequent formation of the gel, which results in a crystalline network structure after heat treatment. The influences of MWCNTs: TiO2 ratio and calcination temperature on the physical as well as chemical characteristic and photocatalytic ability, which was examined by conduction photocatalytic degradation of of salicylic acid by both UV and visible lights.
Comparing to the TiO2 catalysts systhesized in this work, TiO2 /MWCNTs composites has better photocatalytic activity. This suggests that the MWCNTs may hinder the recombination of electron and electron holes. However, when MWCNTs: TiO2 is higher than 5%, the addition of MWCNTs reduced the photocatalytic ability because that the MWCNTs are black and would block or adsorb the incident light.
關鍵字(中) ★ 二氧化鈦
★ 多壁奈米碳管
★ 水楊酸
★ 溶膠凝膠法
關鍵字(英)
論文目次 目錄
摘要 I
Abstract II
誌謝 III
目錄 IV
圖目錄 VII
表目錄 X
第一章 前言 1
1.1. 研究緣起 1
1.2. 研究內容與目的 2
1.3. 研究流程 4
第二章 文獻回顧 5
2.1. 奈米碳管 5
2.1.1 基本特性 5
2.1.2 奈米碳管製備方式 9
2.1.3 奈米碳管之改質方法 11
2.2. 二氧化鈦光觸媒 16
2.2.1 二氧化鈦結構特性 16
2.2.2 二氧化鈦光觸媒製備 19
2.2.3 光催化反應 23
2.2.4 二氧化鈦複合材料相關文獻 27
2.3. 水楊酸 (salicylic acid) 35
2.3.1水楊酸特性及來源 35
第三章 實驗方法 38
3.1. 實驗材料與設備 38
3.1.1 實驗材料 38
3.1.2實驗設備 39
3.2. 實驗方法 43
3.2.1 多壁奈米碳管改質 43
3.2.2 MWCNT/TiO2 複合顆粒製備 45
3.2.3 光催化分析 47
第四章 結果與討論 48
4.1. 材料特性鑑定分析 48
4.1.1 表面型態FE-SEM及EDS 49
4.1.2 穿透式顯微鏡(TEM)分析 55
4.1.3 氮孔隙分析孔洞分布、表面積及吸脫附情形 60
4.1.4 MWCNTs及複合材料之官能基分析 (FT-IR) 72
4.1.5 X-ray繞射(XRD)晶格結構分析 74
4.2. 光催化反應活性測試 81
4.2.1 背景實驗 82
4.2.2 水楊酸吸附試驗 84
4.3. MWCNTs:TiO2及光源對MWCNTs / TiO 2光催化能力影響 85
4.3.1 不同碳管添加量之MWCNTs / TiO 2 光觸媒UV光光催化 85
4.3.2 不同碳管添加量之MWCNTs / TiO 2 光觸媒可見光光催化 89
4.4. 鍛燒溫度對MWCNTs / TiO 2光催化降解能力之影響 94
第五章 結論與建議 97
5.1. 結論 97
5.2. 建議 98
參考文獻 99
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指導教授 秦靜如 審核日期 2013-7-30
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