維生素C對二氧化鈦溶膠之影響及其催化應用

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姓名

許佩婷(Pei-ting Hsu) 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

維生素C對二氧化鈦溶膠之影響及其催化應用

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摘要(中)

二氧化鈦是一種能將有害物質降解為水和二氧化碳的光觸媒之一。在本研究中以溶膠凝膠法製備二氧化鈦溶膠，其中以四氯化鈦為前驅物而過氧化氫作為塑解劑在95度高溫下將氫氧化鈦水溶液轉換成二氧化鈦溶膠。本研究之目的最主要著重於提高二氧化鈦溶膠之穩定性以及加強二氧化鈦在可見光範圍之光催化應用。加入維生素C溶液可形成電荷轉移之複合物，此有著特殊彎曲的Ti-O鍵會使二氧化鈦的光吸收度紅移至可見光區並可有效降低顆粒凝聚現象，達到系統的穩定性。本研究透過X光粉末繞射分析儀 (XRD)、雷射粒徑分析儀 (DLS)、超高真空場發射掃描式電子顯微鏡 (SEM)、穿透式電子顯微鏡 (TEM)、高解析掃描穿透式電子顯微鏡 (HRTEM)、傅立葉紅外線光譜儀 (FTIR)以及紫外光-可見光分光光度計 (UV-vis)來分析二氧化鈦溶膠和改質二氧化鈦溶膠。從XRD圖譜、選區繞射圖 (SAED)和HRTEM的晶格距離 (lattice distance)可得知樣品所對應二氧化鈦中之銳鈦礦相。而DLS和SEM呈現改質後二氧化鈦的粒徑較未改質二氧化鈦小，此外，DLS也可由ζ電位 (Zeta potential) 確認維生素C增強二氧化鈦溶膠的穩定性。維生素C-二氧化鈦溶膠所形成之Ti-O鍵可由FTIR來判定，其圖譜會出現所對應之波峰。本研究之維生素C-二氧化鈦溶膠的光降解活性使用亞甲基藍染料作為測試，經過UV-vis分析可得到：無論在紫外光或可見光的照射下，維生素C與二氧化鈦之莫爾比等於0.75比1 (AT3)的光催化效果最好。

摘要(英)

Titanium dioxide, a kind of photocatalyst is one of the best ways to degrade harmful materials into H2O and CO2 and it has been studied by the researches. In this study, TiO2 sol was prepared by a sol-gel method using TiCl4 as precursor and H2O2 as peptizing agent in order to induce the formation of TiO2 nanoparticles that converted from Ti(OH)4 under 95 ℃. The objective of this study was to find a method to enhance the stability of the sol and improve the photocatalytic activity of TiO2 under visible light irradiation. Adding ascorbic acid solution into TiO2 sol would form a charge-transfer complex, leading to red shift TiO2 up to visible light region and decrease the agglomeration to attain the stable environment due to the formation of specific Ti-O band with large curvature. TiO2 and AA-modified TiO2 nanoparticles were characterized by XRD, DLS, SEM, TEM, HRTEM, FTIR, and UV-vis spectroscopy. XRD patterns, SAED, lattice distance of HRTEM confirm that all of samples were in anatase phase. While DLS and SEM presented that the particle size of AA-modified TiO2 was smaller than that of pure TiO2 and DLS also ensured that surface modifier would enhance the stability of TiO2 sol. The new binding of AA-modified TiO2, Ti-O-C was demonstrated by FTIR spectra. AT3 (the molar ratio of AA: TiO2= 0.75:1) showed high activity both under UV light and visible light irradiation for the photocatalytic degradation of methylene blue dye.

關鍵字(中)

★ 二氧化鈦
★ 維生素C
★ 表面改質劑
★ 電荷轉移複合物
★ 亞甲基藍之光催化降解

關鍵字(英)

★ titanium dioxide
★ ascorbic acid
★ surface modifier
★ charge-transfer complex
★ photocatalytic degradation of methlyene blue

論文目次

中文摘要 i
Abstract ii
Table of Contents iii
List of Figures vi
List of Tables ix
Chapter 1 Literature Review 1
1.1 Introduction 1
1.2 Heterogeneous Titanium dioxide photocatalyst 2
1.2.1 Properties of Titanium dioxide 3
1.2.2 Reaction mechanisms of Titanium dioxide 4
1.3 Modification of Titanium dioxide 7
1.3.1 Metal-doping 7
1.3.2 Coupling with metal oxides 8
1.3.3 Non-metal doping 9
1.3.4 Surface modification by polymers 10
1.4 Ascorbic acid-TiO2 as photocatalyst 11
1.4.1 Mechanism of Ascorbic acid addition in TiO2 13
2.5 Objective 15
Chapter 2 Experimental 17
2.1 Materials 17
2.2 Methodology 17
2.2.1 Synthesis of TiO2 and Ascorbic acid-modified TiO2 sols 17
2.2.2 Preparation of AA-modified TiO2 thin film on glass 18
2.3 Characterization 19
2.3.1 X-Ray Diffraction (XRD) 19
2.3.2 Dynamic Light Scattering (DLS) 22
2.3.3 Scanning Electron Microscopy (SEM) 22
2.3.4 Transmission Electron Microscopy (TEM) and High-resolution Electron Microscopy (HRTEM) 23
2.3.5 Fourier transform infrared spectroscopy 25
2.3.6 UV-visible spectrophotometer 25
2.4 Degradation of methylene blue 26
2.4.1 Photocatalytic activity under UV light irradiation 28
2.4.2 Photocatalytic activity under visible light irradiation 29
Chapter 3 Preparation of Ascorbic acid-modified Titanium Dioxide Thin Film, and its Application on Photocatalytic Degradation of Methlyene Blue 30
3.1 Results and discussion 30
3.1.1 Characteristics of TiO2 and AA-modified TiO2 sols 30
3.1.2 XRD 31
3.1.3 DLS 34
3.1.4 SEM 37
3.1.5 TEM and HRTEM 39
3.1.6 FTIR 44
3.1.7 The absorption spectra by UV-vis 48
3.1.8 Photocatalytic destruction of methylene blue under UV light irradiation 49
3.1.9 Photocatalytic destruction of methylene blue under visible light irradiation 53
Chapter 4 Conclusions 57
References 59

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指導教授

陳郁文(Yu-wen Chen)

審核日期

2015-6-29

推文