博碩士論文 105326022 詳細資訊




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姓名 李昀恩(Yun-En Lee)  查詢紙本館藏   畢業系所 環境工程研究所
論文名稱 以LaFeO3/Black-TiO2行光催化反應以去除甲苯及異丙醇之可行性探討
(Photocatalytic oxidation of toluene and isopropanol by LaFeO3/Black-TiO2)
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摘要(中) 揮發性有機物(VOCs) 之來源非常廣泛,暴露於VOCs環境中會對人體健康及環境造成不利之影響,會產生如頭痛、噁心、頭暈、刺鼻及咳嗽等症狀,這些長存於生活環境中之VOCs,對人體及環境之危害不容忽視。本研究為利用溶膠凝膠法分別製備black-TiO2及LaFeO3 (LFO) perovskite光觸媒,並利用物理性混合以特定比例將LFO擔載於black-TiO2上,以製備LFO/black-TiO2。將自製之black-TiO2及LFO/black-TiO2與市售之TiO2進行甲苯及異丙醇之去除活性測試比較,並藉由XRD、EPR、UV-vis、XPS及PL等儀器針對三種觸媒進行物化特性之分析與比較,藉由操作參數了解最佳之操作參數。研究結果顯示black-TiO2以250W氙燈為光源於50 sccm的流率下,初始濃度為100 ppm之甲苯及異丙醇的轉化率分別達89% 及99%,且礦化率也分別達87%及96%,而LFO/black-TiO2及市售TiO2對甲苯之轉化率則分別為87%及43%;對異丙醇之轉化率則分別為90% 及60%,顯示black-TiO2有最好之光催化活性,後續實驗將TiO2、black-TiO2及LFO/black-TiO2作比較,並探討氧氣濃度、流量及水氣含量變化下,對甲苯及異丙醇轉化效率之影響,結果顯示三種觸媒對於參數變化之趨勢皆相同,氧氣含量上升轉化效率也隨之上升,因此氧氣含量與轉化效率呈正相關,而在流量及水氣含量變化方面,則隨參數增加而轉化效率隨之下降。整體而言,本研究結果顯示LFO/black-TiO2及black-TiO2可有效去除氣流中之甲苯及異丙醇,具有發展潛力。
摘要(英) Volatile organic compounds (VOCs) are important air pollutants emitted from industrial, domestic and natural sources. Toluene and isopropanol (IPA) are VOCs which are commonly used in industrial manufacture. Typical technologies including adsorption, absorption, and combustion have been employed to eliminate VOCs from gas streams. Recently, photocatalysis is regarded as a potential way for the removal of VOCs. TiO2 is the most common photocatalyst in the photocatalysis field and also the most likely to be applied in industrial scale, due to its non-toxicity, abundance and photo/chemical stability. However, TiO2 has some limits including it has fast recombination rate of electron-hole pair and only absorbs UV light. Therefore, in this study, removal of toluene and IPA were investigated using black-TiO2 catalyst. Black-TiO2 can absorb visible light and has more defects on the catalyst surface. In this study, we discuss the conversion rate of VOCs by black-TiO2. The results, indicate that 98% and 89% conversion rate can be achieved for IPA and toluene, respectively. As the oxygen content is increased, the conversion rate also increases. As flow rate and hydrogen concentrations are increased, the conversion rate decreases. The results indicate higher removal efficiencies can be achieved with black-TiO2 when compared with TiO2 and LFO/black-TiO2. Overall, the preliminary results indicate that black-TiO2 can enhance the performance of photocatalysis system for toluene and IPA removal.
關鍵字(中) ★ 揮發性有機物
★ 光催化
★ Perovskite-type光觸媒
★ Black-TiO2
★ 可見光
關鍵字(英)
論文目次 摘要 I
Abstract II
圖目錄 VI
表目錄 IX
第一章 前言 1
1.1 研究緣起 1
1.2 研究目的 2
第二章 文獻回顧 3
2.1 揮發性有機物之簡介 3
2.1.1 揮發性有機物物種及定義 3
2.1.2 揮發性有機物之控制技術 4
2.2 實驗選定之揮發性汙染物之特性 6
2.2.1 甲苯之特性 6
2.2.2 異丙醇之特性 8
2.3 光觸媒 10
2.3.1 光觸媒介紹 10
2.3.2 可見光光觸媒 12
2.3.3 光觸媒去除VOCs之應用 21
2.3.4 不同參數對VOCs去除效率之影響 24
第三章 研究方法 29
3.1 實驗流程及架構 29
3.2 實驗系統架設 29
3.3 實驗流程 31
3.3.1 觸媒材料製備 31
3.3.2 光催化實驗 33
3.3.3 實驗分析 33
3.3.4 觸媒材料之物化特性分析 35
3.4 實驗結果計算 39
3.5 實驗設備及材料 40
3.5.1 實驗設備 40
3.5.2 實驗藥品與氣體 41
第四章 結果與討論 42
4.1 觸媒基本物化特性分析 42
4.1.1 XRD晶相分析 42
4.1.2 BET氮氣吸脫附分析 43
4.1.3 UV-Vis 分析 44
4.1.4 SEM及TEM分析 45
4.1.5 ESCA 特性分析 48
4.1.6 EPR 分析 51
4.1.7 螢光光譜分析 52
4.2 光催化參數測試 53
4.2.1 系統穩定性測試 53
4.2.2 三種光觸媒對甲苯及異丙醇降解效率之比較 56
4.2.3 水氣變化對甲苯及異丙醇降解效率之影響 58
4.2.4 流量變化對甲苯及異丙醇降解效率之影響 63
4.2.5 氧氣變化對甲苯及異丙醇降解效率之影響 67
4.2.6 甲苯及異丙醇之光催化能量效率 71
4.2.7 甲苯及異丙醇去除之產物分析 73
4.2.8 甲苯及異丙醇去除之反應途徑推估 76
4.2.9 三種觸媒之動力探討 79
第五章 結論與建議 85
5.1 結論 85
5.2 建議 86
參考文獻 87
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指導教授 張木彬 審核日期 2018-8-23
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