鈣鈦礦釔鐵氧化物/碳纖維複合電極應用於有機汙水處理之研究

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姓名

郭彥伸(Yen-Shen Kuo) 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

鈣鈦礦釔鐵氧化物/碳纖維複合電極應用於有機汙水處理之研究
(Study of Perovskite YFeO3/Carbon Fiber Composite Electrode for Organic Wastewater Treatment)

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摘要(中)

水是人類不可或缺的資產，然而如果被有害的化學物質污染，水資源將無法妥善利用，其中工廠排放的廢水通常含有複雜且有害的有機化合物，可以藉由污水處理程序以獲得乾淨的水源。關於污水處理，已經有諸多研究證實可以降解廢水中的有機污染物。例如，鈣鈦礦材料由於其優異的光催化活性，在污水處理的應用上，呈現優異的結果。如果將鈣鈦礦材料結合適當的集電體基材，則可以誘導其電催化效果。在本研究中，我們嘗試利用具有三維網絡結構且導電的碳纖維作為集電體基材與鈣鈦礦材料結合，製備鈣鈦礦/碳纖維複合電極，應用於有機污水處理。
本實驗透過修飾溶膠凝膠程序製備鈣鈦礦/碳纖維電極。首先將數種硝酸鹽和檸檬酸藉由溶膠凝膠法獲得YFeO3先驅物，再將YFeO3先驅物以不同目標溫度進行鍛燒，形成粉末狀YFeO3。最後將YFeO3粉末塗佈於碳纖維上，製備出複合電極。
用X射線繞射分析儀(XRD)，熱重分析儀(TGA)和掃描式電子顯微鏡(SEM)分析了複合材料的性能。此外透過由複合電極組成的光電催化系統來進行有機污水處理。根據特性分析實驗結果顯示，碳纖維經由前處理程序可將表面環氧樹脂除去以提高導電性；YFeO3具有良好結晶性且傾向形成團聚的多孔性結構；複合電極則證實YFeO3成功地塗佈在碳纖維上。汙水處理應用實驗結果顯示，YFeO3光催化在可見光下經過120分鐘後的去除效率為51%；複合電極光電催化的最佳條件為0.75 mM FeSO4、25℃、pH 3.0、可見光光源，去除效率經過30分鐘後達到96%，擬二級反應動力常數為0.0387 L mg-1 min-1。藉由電化學阻抗譜分析得知，較低的電荷轉移阻抗可以有效提升有機污水的去除效率。

摘要(英)

Water is an indispensable asset for human; however, it immediately becomes unavailable if contaminated by harmful chemical substances. Particularly, industrial wastewater composed of complicated chemical compounds usually accounts for the serious issue. With regard to wastewater treatment, many methods have been proved to be able to degrade organic pollutants. For example, perovskite materials can be applied on organic wastewater treatment due to their photocatalytic reactivity. If perovskite materials are further integrated with a proper electrical conductor, their electrocatalytic effect can be induced. In this study, we try to utilize carbon fibers (CFs), which possesses three-dimensional electrically conductive network, as current collectors to combine with perovskite materials, making a perovskite/CF electrode for organic wastewater treatment.
For the experiment, we prepared the perovskite/CF electrode through a modified sol-gel process. First, YFeO3 precursors were made by several kinds of nitrate and citric acid with sol-gel method. Then, YFeO3 precursors experienced a calcination process with different temperatures as a parameter, forming a powder-type product. Finally, we coated the YFeO3 powders on carbon fibers to make the composite electrode.
X-ray powder diffraction (XRD), thermogravimetric analysis (TGA), and scanning electron microscope (SEM) were used to analyze the composite material properties. In addition, a photo-electrocatalytic system composed of the perovskite/CF electrode was established to carry out the organic wastewater treatment. Based on the analyzed results, YFeO3 possessed a good crystallinity and they tended to form aggregates with porous structure; it is also confirmed that YFeO3 successfully deposit on the carbon fibers, forming the composite electrode. As for the wastewater treatment, the removal efficiency can achieve 51% through a 120-min YFeO3 photocatalysis; the YFeO3/CF composite electrode exhibits a favorable photo-electrocatalytic activity of 96% at 0.75 mM FeSO4, 25℃ and pH 3.0 under visible light irradiation after a 30-min treatment, and rate constant k is calculated as 0.0387 Lmg-1min-1. According to electrochemical impedance spectroscopy (EIS), the composite electrode effectively degrade organic pollutants due to smaller charge transfer resistance.

關鍵字(中)

★ 鈣鈦礦材料
★ 複合電極
★ 光電催化
★ 有機污水
★ 電芬頓

關鍵字(英)

★ perovskite materials
★ composite electrode
★ photo-electrocatalysis
★ organic waste water
★ electro-Fenton

論文目次

摘要 i
Abstract ii
致謝 iii
目錄 iv
圖目錄 viii
表目錄 xii
一、緒論 1
1-1 前言 1
1-2 研究目的 2
二、文獻回顧 3
2-1 高級氧化程序 3
2-2 光催化反應 4
2-2-1 光觸媒簡介 4
2-2-2 二氧化鈦光觸媒 8
2-3 鈣鈦礦光觸媒 11
2-3-1 鈣鈦礦材料簡介 11
2-3-2 鈣鈦礦材料應用於汙水處理文獻回顧 12
2-4 電解氧化程序 15
2-5 電芬頓程序 17
2-5-1 芬頓程序 17
2-5-2 電芬頓程序 19
2-6 複合材料 21
2-6-1 複合材料簡介 21
2-6-2 碳纖維 22
2-7 有機汙染物 24
三、實驗方法 27
3-1 實驗架構 27
3-2 實驗材料與設備 29
3-2-1 實驗材料 29
3-2-2 實驗設備 31
3-3 實驗方法與步驟 32
3-3-1 碳纖維前處理 32
3-3-2 YFeO3鈣鈦礦合成 32
3-3-3 RB5檢量線繪製 33
3-3-4 YFeO3鈣鈦礦光催化實驗 33
3-3-5 YFeO3/CF複合電極製備 34
3-3-6 YFeO3/CF複合電極(光)電催化實驗 34
3-4 分析儀器介紹 36
3-4-1 X射線繞射分析儀(X-ray Diffraction, XRD) 37
3-4-2 掃描式電子顯微鏡(Scanning Electron Microscope, SEM) 38
3-4-3 穿透式電子顯微鏡(Transmission Electron Microscope, TEM) 39
3-4-4 傅立葉轉換紅外光譜儀(Fourier-Transform Infrared Spectroscopy, FTIR) 39
3-4-5 X射線光電子能譜儀(X-ray Photoelectron Spectroscopy, XPS) 40
3-4-6 熱重分析儀(Thermogravimetric Analyzer, TGA) 40
3-4-7 紫外光-可見光分光光譜儀(Ultraviolet-Visible Spectroscopy, UV-VIS) 41
3-4-8 交流阻抗儀 42
四、結果與討論 43
4-1 碳纖維前處理分析 43
4-1-1 SEM影像分析 43
4-1-2 FTIR光譜分析 45
4-1-3 熱重曲線分析 46
4-2 YFeO3鈣鈦礦光觸媒分析 47
4-2-1 X射線繞射圖譜分析 47
4-2-2 表面形貌及微結構分析 49
4-2-3 熱重曲線分析 51
4-2-4 X射線光電子能圖譜分析 52
4-3 YFeO3鈣鈦礦光催化特性分析 60
4-3-1 紫外光下YFeO3鈣鈦礦光催化特性分析 60
4-3-2 YFO-700於紫外光和可見光下光催化特性分析 61
4-3-3 可見光下YFO-700和TiO2光催化特性分析 62
4-4 YFeO3/CF複合電極分析 63
4-4-1 X射線繞射圖譜分析 63
4-4-2 熱重曲線分析 64
4-4-3 表面形貌分析 66
4-5 YFeO3/CF複合電極光電催化特性分析 67
4-5-1 YFeO3/CF複合電極電催化特性分析 67
4-5-2 不同溶液pH值光電催化特性分析 68
4-5-3 不同溫度光電催化特性分析 69
4-5-4 不同FeSO4濃度光電催化特性分析 70
4-5-5 不同光源光電催化特性分析 71
4-5-6 光電催化反應機制分析 72
4-5-7 光電催化反應動力學分析 74
4-5-8 電化學阻抗譜分析 77
五、結論與建議 79
5-1 結論 79
5-2 建議 80
六、參考文獻 81
附錄 90

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指導教授

劉奕宏(Yi-Hung Liu)

審核日期

2020-8-10

推文