釔鐵氧化物/氧化鈰光陽極應用於有機汙水處理

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姓名

林睦融(Mu-Jung Lin) 查詢紙本館藏

畢業系所

化學工程與材料工程學系

論文名稱

釔鐵氧化物/氧化鈰光陽極應用於有機汙水處理
(YFeO3/CeO2 Photoanode for Organic Wastewater Treatment)

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至系統瀏覽論文 (2027-6-30以後開放)

摘要(中)

異質半導體光觸媒主要是藉由兩種不同半導體界面，來提升單一半導體光觸媒的光催化性能，因異質結能有效增加電子電洞對的分離能力，降低複合率。在本研究中藉由sol-gel法成功合成了YFeO3/CeO2複合材料，且提升了YFeO3的光催化特性。在瞬時光電流檢測中，YFeO3/30%CeO2複合材料能將YFeO3的光電流密度從12.8 µA/cm2 增加為156.3 µA/cm2，提升大約12倍，也有著比純CeO2好的光電催化特性。此外，在其他比例下的複合材料的光電流密度也會隨著CeO2含量增加，可得知YFeO3/CeO2異質結確實能提升光電化學表現。
而在本研究也進行了光催化降解RB5和光電催化降解RB5的比較。在光催化系統中。YFeO3、CeO2、YFeO3 /30 %CeO2光降解效率分別18.5 %、37.4 %和48.0 %；而在光電催化降解系統中，YFeO3、CeO2和YFeO3 / 30%CeO2光電催化降解RB5效率為32.6%、47.9 %和75.6 %，從結果可知藉由外加電壓的幫助，能有效地將電子傳輸於對電極，降低電子電洞對複合率，使降解效率大大提升。最後將YFeO3、CeO2分別進行了Mott-Schottky測量，得知其平帶位置。再經由計算得知YFeO3和CeO2的導帶位置和價帶位置，推論出了YFeO3/CeO2複合材料光催化降解RB5反應機制。

摘要(英)

Heterogeneous semiconductor photocatalysts mainly use two different semiconductor interfaces to improve the photocatalytic performance of a single semiconductor photocatalyst, because the heterojunction can effectively increase the separation ability of electron-hole pairs and reduce the recombination rate. In this study, YFeO3/CeO2 composites were successfully synthesized by the sol-gel method, and the photocatalytic properties of YFeO3 were improved.
In the instantaneous photocurrent detection, the YFeO3/30%CeO2 composite can increase the photocurrent density of YFeO3 from 12.8 µA/cm2 to 156.3 µA/cm2, an increase of about 12 times, and it also has better photocatalytic properties than pure CeO2. In addition, the photocurrent density of the composites at other ratios also increases with the CeO2 content, indicating that the YFeO3/CeO2 heterojunction can indeed improve the photoelectrochemical performance.
In this study, the photocatalytic degradation and the photoelectrocatalytic degradation of RB5 were also compared. In the photocatalytic system, the photodegradation efficiencies of YFeO3, CeO2, and YFeO3/30 %CeO2 were 18.5%, 37.4% and 48.0%, respectively. On the other hand, in the photoelectrocatalytic degradation system, the degradation efficiencies of YFeO3, CeO2, YFeO3/30 %CeO2 for RB5 were 32.6%, 47.9% and 75.6%, respectively. It can be seen from the results that with the help of the applied voltage, electrons are effectively transferred to the counter electrode, the recombination rate of electron-hole pairs can be reduced, and the degradation efficiency can be greatly improved. Finally, the Mott-Schottky measurements were performed on YFeO3 and CeO2, respectively, and the position of the flat band was obtained. Then the conduction band position and valence band position of YFeO3 and CeO2 were obtained by calculation. Furthermore, the mechanism of photocatalytic degradation of RB5 by YFeO3/CeO2 composites was deduced.

關鍵字(中)

★ 異質半導體光觸媒
★ 釔鐵氧化物
★ 氧化鈰
★ 光催化系統
★ 光電催化系統

關鍵字(英)

★ Heterogeneous semiconductor photocatalyst
★ YFeO3
★ CeO2
★ photocatalytic
★ photoelectrocatalytic

論文目次

摘要 i
Abstract ii
致謝 iii
目錄 iv
圖目錄 vii
表目錄 xii
第一章、緒論 1
1-1 前言 1
1-2 光觸媒發展 2
1-2 研究目的 3
第二章、文獻回顧 4
2-1 半導體光觸媒 4
2-1-1 半導體 4
2-1-2 半導體與電解液界面 6
2-1-3 光觸媒 7
2-1-4光觸媒催化原理 7
2-1-5光催化反應過程 9
2-1-6光催化和光電化學差異 10
2-2鈣鈦礦YFeO3光觸媒 11
2-2-1鈣鈦礦材料 11
2-2-2 YFeO3光觸媒 12
2-2-3 YFeO3光觸媒文獻回顧 13
2-3 CeO2光觸媒 15
2-4改善光觸媒催化性能方法 16
2-4-1 表面型態優化 16
2-4-2 元素參雜 19
2-4-3異質接合結構 23
2-4-3-1Ⅰ型異質結 25
2-4-3-2 Ⅱ型異質結 30
第三章、實驗方法 38
3-1 實驗架構 38
3-2 實驗藥品與儀器設備 40
3-3 實驗分析儀器 41
3-3-1 X射線繞射分析儀(X-ray diffraction,XRD) 41
3-3-2 場發射掃描式電子顯微鏡(Scanning Electron Microscope, SEM) 42
3-3-3傅立葉轉換紅外光譜儀(Fourier-Transform Infrared Spectroscopy, FTIR) 42
3-3-4 X射線光電子能譜儀(X-ray Photoelectron Spectroscopy,XPS) 42
3-3-5紫外光-可見光分光光譜儀(Ultraviolet-Visible Spectroscopy, UV-VIS) 43
3-4實驗步驟 43
3-4-1 YFeO3光觸媒製備 43
3-4-2 YFeO3/CeO2光觸媒製備 43
3-4-3 YFeO3/CeO2電極材料製備 43
3-4-4 光電化學量測 44
3-4-5 RB5濃度檢量線繪製 45
3-4-6光催化降解測量 46
3-4-7光電催化降解活性測量 46
第四章、結果與討論 47
4-1 YFeO3鈣鈦礦光觸媒 47
4-1-1 不同溫度製程下對於YFeO3鈣鈦礦光觸媒的影響 47
4-1-2 YFeO3鈣鈦礦光觸媒光學分析 49
4-1-3 YFeO3鈣鈦礦光觸媒熱重量分析 51
4-2 YFeO3/CeO2光觸媒 52
4-2-1 X射線繞射圖譜(XRD)分析 52
4-2-2 形態表徵 54
4-2-3 X射線光電子能譜分析 55
4-2-4 傅立葉變換紅外光譜分析 57
4-2-5 紫外-可見漫反射光譜和帶隙能量 58
4-3 光電化學分析 61
4-3-1 電壓對於YFeO3/CeO2光電極的影響 61
4-3-2 YFeO3/CeO2光電極的瞬時光電流量測 64
4-3-3電化學阻抗分析 67
4-4 Mott-Schottky測量 70
4-5光催化降解測量 72
4-6光電催化降解測量 74
4-7 YFeO3/CeO2光觸媒光電化學反應動力學探討 77
4-8 YFeO3/CeO2光觸媒催化反應機制探討 79
第五章、結論 82
參考文獻 83
附錄一 87

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指導教授

劉奕宏(Yi-Hung Liu)

審核日期

2022-9-15

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