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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 林正芳(Cheng-Fang Lin) | |
dc.contributor.author | Jia-Hong Tsai | en |
dc.contributor.author | 蔡家弘 | zh_TW |
dc.date.accessioned | 2021-06-13T15:38:21Z | - |
dc.date.available | 2013-07-16 | |
dc.date.copyright | 2008-07-16 | |
dc.date.issued | 2008 | |
dc.date.submitted | 2008-07-09 | |
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/37680 | - |
dc.description.abstract | 本研究利用結合超音波與UV/TiO2光觸媒光催化氧化法(sonophotocatalysis)降解全氟辛酸(PFOA),分為串聯(sequential)與同時(simultaneous)操作,以探討PFOA的去除效率。
自行合成的Sol-gel TiO2經BET分析得比表面積為38.54 m2/g,TEM圖顯示粒徑約為30至50 nm,XRD分析礦物晶型為Anatase與Rutile共存的結構,能隙為3.03 eV。 僅用光催化法之PFOA去除效率為22%,零階速率常數為0.0292 (hr-1),當結合超音波與光催化系統於同時操作時,超音波震盪可使TiO2保持均勻分散,減少發生凝聚現象(agglomerate),並使表面反應位置更新(refreshed),以增加TiO2與反應物的質量傳輸效率,產生協同效應(synergistic effect)有效使PFOA去除效率提升至49%,擬一階速率常數為0.0866 (hr-1),串聯操作則無提升效率,而將TiO2改為Sol-gel TiO2後,去除效率更提升至64%,擬一階速率常數為0.1309 (hr-1)。在不同pH環境時,去除效率為:鹼性(pH=10) > 酸性(pH=4) > 中性(pH=7),因鹼性環境下有較多高反應性氫氧自由基(.OH)與PFOA進行降解反應。 PFOA可有效被降解成毒性較低的全氟庚酸(PFHpA)、全氟己酸(PFHxA)與氟離子之中間產物,減少PFOA在環境中的危害性。 | zh_TW |
dc.description.abstract | The objective is to utilize ultrasonic irradiation assisted photo-catalysis which divided into sequential operation and simultaneous operation for perfluorooctanoic acid (PFOA) removal in this study. The process is called “sonophotocatalysis.”
The specific surface area of synthesized sol-gel TiO2 was 38.54 (m2/g) by BET analysis and the particle diameter was about 30 to 50 nm by TEM. Its crystal structure was a mixture of anatase and rutile showed by XRD analysis. Also, it had 3.03 eV for energy band gap. The removal efficiency of PFOA was 22% and rate constant of zero-order equation, k, was 0.0292 (hr-1) for only photo-catalysis. It was increased to 49% and 0.0866 (hr-1) of pseudo first-order rate constant, k, due to the synergistic effect in simultaneous operation. Because ultrasonic irradiation can disperse TiO2 more evenly, prevent the agglomerate of TiO2, and keep the reactive surface of TiO2 being refreshed to increase mass transfer between TiO2 and reactant. However, the removal efficiency of PFOA was increased to 64% and 0.1309 (hr-1) of k by using sol-gel TiO2. But sequential operation was useless. In addition, the removal efficiency was better at pH=10 > pH=4 > pH=7 because there are much hydroxide radicals (.OH) to react with PFOA at pH=10. PFOA was also efficient to degrade to intermediates, such as PFHpA, PFHxA and fluoride ion to be harmfulless. | en |
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dc.description.tableofcontents | 誌謝 I
中文摘要 II ABSTRACT III 目錄 IV 圖目錄 VII 表目錄 IX 第一章 緒論 1 1-1 前言 1 1-2 研究動機與假設 2 1-3 研究目標與內容 3 1-3-1 研究目標 3 1-3-2 研究內容 3 1-4 工作項目 4 第二章 文獻回顧 5 2-1 全氟辛酸 5 2-1-1 物理化學性質 6 2-1-2 來源及使用 7 2-1-3 環境暴露途徑 8 2-1-4 環境宿命 9 2-1-5 人體健康之影響 11 2-1-6 全氟辛酸相關之中間產物簡介 11 2-2 光催化法之介紹 12 2-2-1 光觸媒 12 2-2-1-1 半導體特性介紹 12 2-2-1-2 能隙 14 2-2-1-3 二氧化鈦 15 2-2-1-4 溶膠凝膠法 16 2-2-2 光催化反應機制與原理 18 2-2-2-1 異相光催化反應 20 2-2-2-2 反應動力學 22 2-2-3 提升光催化活性之方法 22 2-3 超音波反應機制與原理 23 2-4 去除全氟辛酸之相關研究文獻 25 第三章 實驗方法與材料 26 3-1 實驗內容與項目 26 3-1-1 光觸媒之物理化學特性分析 28 3-1-2 光催化之污染物濃度分析 29 3-1-3 控制因子與操作因子 30 3-2 光觸媒之製備 31 3-2-1 實驗原理 31 3-2-2 實驗步驟 32 3-2-3 實驗材料 34 3-2-3-1 藥品 34 3-2-3-2 儀器器材 34 3-2-4 分析儀器與方法 34 3-2-4-1 紫外光/可見光光譜儀 35 3-2-4-2 比表面積與孔洞分析儀 36 3-2-4-3 X光粉末繞射儀 37 3-2-4-4 穿透式電子顯微鏡 37 3-3 光催化反應實驗 37 3-3-1 實驗內容 37 3-3-2 實驗步驟 39 3-3-3 實驗材料 40 3-3-3-1 藥品 40 3-3-3-2 儀器器材 41 3-3-4 實驗設備 42 3-3-5 分析儀器與方法 44 3-3-5-1 高效能液相層析串聯質譜儀 44 3-3-5-2 離子層析儀 48 第四章 結果與討論 49 4-1 光觸媒特性分析 49 4-1-1 比表面積大小 49 4-1-2 礦物晶型結構 50 4-1-3 能隙大小分析 52 4-1-4 表面型態觀察 54 4-2 背景實驗 56 4-2-1 揮發實驗 56 4-2-2 吸附實驗 57 4-2-3 直接光解實驗 58 4-3 光催化反應實驗 60 4-3-1 最佳UV光瓦數與最佳光觸媒添加量 60 4-3-2 外加超音波場源之光催化反應 64 4-3-3 自行合成TiO2光觸媒於超音波結合光催化反應 67 4-3-4 中間產物與反應機制 70 4-3-5 不同pH值對於光催化去除PFOA之影響 73 第五章 結論與建議 79 5-1 結論 79 5-2 建議 81 參考文獻 82 附錄 94 | |
dc.language.iso | zh-TW | |
dc.title | 超音波促進光催化氧化法去除水中全氟辛酸 | zh_TW |
dc.title | Perfluorooctanoic Acid (PFOA) Removal by Sonication Assisted Photo-Catalytic Oxidation | en |
dc.type | Thesis | |
dc.date.schoolyear | 96-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 林郁真(Angela Yu-Chen Lin),郝晶瑾,康佩群 | |
dc.subject.keyword | 全氟辛酸,結合超音波與光催化反應系統,協同效應, | zh_TW |
dc.subject.keyword | Perfluorooctanoic acid (PFOA),Sonophotocatalysis,Synergistic effect, | en |
dc.relation.page | 99 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2008-07-09 | |
dc.contributor.author-college | 工學院 | zh_TW |
dc.contributor.author-dept | 環境工程學研究所 | zh_TW |
顯示於系所單位: | 環境工程學研究所 |
文件中的檔案:
檔案 | 大小 | 格式 | |
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ntu-97-1.pdf 目前未授權公開取用 | 2.2 MB | Adobe PDF |
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