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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 駱尚廉(Shang-Lien Lo) | |
dc.contributor.author | Kai-Yao Wang | en |
dc.contributor.author | 王楷堯 | zh_TW |
dc.date.accessioned | 2021-06-16T13:06:21Z | - |
dc.date.issued | 2013 | |
dc.date.submitted | 2013-08-02 | |
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/61578 | - |
dc.description.abstract | 本研究利用光沉積法製備由TiO2和Fe改質成的光觸媒,克服純TiO2高電子電洞再結合率的問題,大幅提升處理偶氮染料Acid Red 27 (AR27) 的效率。實驗先由貴金屬Ag (k=0.0047min-1)、過度金屬Fe (k=0.0419min-1)、稀土金屬Ce (k=0.0018min-1)三種金屬中,選定Fe為最佳披覆二氧化鈦的金屬,在調整製作光觸媒的操作參數披覆Fe量和Fe0-TiO2的鍛燒溫度,並做SEM-EDX和UV-vis分析Fe0-TiO2的表面特性和測染料、觸媒之最大吸收波長、AR27脫色率,最後找出最佳光降解AR27之實驗環境如UV光種類、觸媒劑量、pH、曝氣種類,探討其中的反應機制。
由SEM-EDX結果可知,Fe在TiO2上的披覆量為重量百分比0.71%左右,觸媒粒徑約為34 nm,Fe0-TiO2¬鍛燒溫度達450度,其晶型主要為銳鈦礦,能有效降解AR27,繼續升溫至550度,銳鈦礦慢慢轉變成晶紅石,效率反而降低。披覆金屬量對於AR27的脫色效率,隨著披覆量的上升而上升直到1 wt%,之後由於遮蔽效應和燒結現象披覆過多Fe反而影響脫色效率,因此選定披覆1 wt%的鐵以450度鍛燒作為光沉積法的最佳操作條件。 本研究的處理的目標汙染為10 ppm之AR27,選用8 W、254 nm之UV光為效益最高之燈管,加入最佳劑量0.5 g的Fe0-TiO2,在25度的恆溫水域中,經過兩小時的光降解,AR27幾乎完全去除,其中在酸性條件下,水中的AR27容易和Fe0-TiO2吸附做進一步的降解反應,因此降解效率pH 3 > pH 7 > pH 9,在曝氣情形下,因氧氣幫助超氧自由基和過氧化氫等強氧化劑的生成,曝氧氣的效率比曝氮氣佳,加入氧化劑0.5 mM H2O2和Na2S2O8能幫助光催化反應的進行,加入抑制劑5 % C2H5OH則反之。 | zh_TW |
dc.description.abstract | This study presents photocatalytic activity of Fe0-TiO2 toward AR27 degradation in aqueous solution. Photocatalyst powders were analyzed for surface composition by scanning electron microscopy (SEM) and crystal composition by energy dispersive X-ray spectrometer (EDX). The SEM image showed that the particle size distribution of Fe0-TiO2 was narrow and the average particle size was approaching 34 nm. EDX result showed that 0.71 wt% Fe was coating on the TiO2. AR27 is detected by UV-Vis spectrometer to find maximum absorption wavelength of AR27 and catalysts. In 25°C, choosing 8W, 254 nm UV light irradiation, AR27 completely photodegradated in the present of the best cost-effective 0.5 g Fe0-TiO2 (1 wt%) photocatalyst after 120 min. Fe0-TiO2 with higher dye photodegradation efficiency was found to prepare with synthesis temperature 450°C than 350°C and 550°C, due to increasing of anatase TiO2 phase. Decolorization capacity of Fe0-TiO2 would increase with increasing coating weight until 1 wt% and decrease with increasing coating weight over 1 wt% of Fe0: 1 wt% > 2 wt% > 10 wt% > 0.5 wt%. The effect of pH on color removal was studied, acidic conditions were more favorable than alkaline condition. In the other hand, aeration is a significant factor for photodegradation. The result showed as follow: O2 > N2. Hydrogen peroxide and persulfate trapped photogenerated electrons and inhibited the recombination of electron/hole pairs in UV/Fe0-TiO2, thereby accelerating decolorization rate. On the contraty, the addition of ethanol inhibited decolorization. And a comparative investigation between Fe0-TiO2, Ag0-TiO2 and Ce0-TiO2 was carried out. The decomposition of AR27 could be well simulated with pseudo first-order kinetics, and the rate constants (kobs) were 0.0419 min-1, 0.0047 min-1, 0.0018 min-1. Fe0-TiO2 particles led to an enhanced photoactivity because of the rapid transfer of the photo-generated electrons from the semiconductors to the dopant. Experimental results indicated that synthesis temperature, coating weight, pH, aeration, oxidants, inhibitors would significantly affect the photo-decolorization capacity. | en |
dc.description.provenance | Made available in DSpace on 2021-06-16T13:06:21Z (GMT). No. of bitstreams: 1 ntu-102-R00541131-1.pdf: 3832963 bytes, checksum: 9899cc3e54b084b58212614fdf22005b (MD5) Previous issue date: 2013 | en |
dc.description.tableofcontents | 誌謝 I
中文摘要 II ABSTRACT III 目錄 V 圖目錄 VIII 表目錄 IX 第一章 緒論 1 1.1 研究緣起 1 1.2 研究目的及內容 2 第二章 文獻回顧 3 2.1 染料概論 3 2.1.1 染料發色原理 3 2.1.2 染料分類 4 2.1.3 偶氮染料 5 2.2 染料處理之研究 7 2.3 台灣染整廢水汙染現況 9 2.4 光催化反應 12 2.4.1 光催化反應基本理論 12 2.4.2 光催化反應分類 13 2.4.3 TiO2半導體簡介 14 2.5 奈米光觸媒的改質 17 2.5.1 光觸媒添加重金屬 17 2.5.2 複合半導體材料 18 2.5.3 光觸媒摻雜過度金屬 18 2.5.4 光觸媒表面敏化 19 2.6 光沉積法 20 2.6.1 貴金屬的改質 22 2.6.2 過渡金屬的改質 23 2.6.3 稀土、鹼土金屬的改質 24 第三張 材料與方法 26 3.1 藥品與設備 26 3.1.1 藥品 26 3.1.2 設備 26 3-2 實驗設計 27 3.3 實驗步驟 29 3.3.1 二氧化鈦之改質-光沉積法 29 3.3.2 AR27之光催化降解 30 3.4 分析項目及方法 31 3.4.1 場發射槍掃描式電子顯微鏡/X射線能量分散光譜儀 31 3.4.2 紫外光-可見光光譜儀 31 第四章 結果與討論 34 4.1 FE-SEM/EDX結果 34 4.2 實驗背景值之影響 38 4.3 各種金屬改質TIO2之影響 39 4.4 FE0-TIO2鍛燒溫度之影響 41 4.5 金屬披覆量之影響 43 4.6 UV光波長和瓦數之影響 45 4.7 觸媒劑量之影響 47 4.8 染料溶液PH的影響 49 4.9 曝氣之影響 51 4.10 鐵改質二氧化鈦之應用-PFOA 53 第五章 結論與建議 54 5.1 結論 54 5.2 建議 55 第六章 參考文獻 56 附錄 實驗數據 60 | |
dc.language.iso | zh-TW | |
dc.title | 以鐵改質二氧化鈦光催化降解酸性紅27之研究 | zh_TW |
dc.title | Photocatalytic Decolorization of Acid Red 27 by Iron-modified TiO2 | en |
dc.type | Thesis | |
dc.date.schoolyear | 101-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 張慶源(Ching-Yuan Chang),劉雅瑄(Ya Hsuan Liou) | |
dc.subject.keyword | 零價鐵,二氧化鈦,光催化反應,Acid Red 27,光沉積法, | zh_TW |
dc.subject.keyword | Acid Red 27,Fe0,TiO2,photocatalytic,photodeposition synthesis method, | en |
dc.relation.page | 70 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2013-08-02 | |
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 |
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