The Effect of Pd and Cu Co-catalysts on the Activity of TiO2 Photocatalyst

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許育瑄(Yu-Hsuan Hsu) 查詢紙本館藏

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化學工程與材料工程學系

論文名稱

(The Effect of Pd and Cu Co-catalysts on the Activity of TiO2 Photocatalyst)

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摘要(中)

這項研究的目的是研究鈀和銅助催化劑對二氧化鈦光催化活性的影響。通過初濕含浸法製備了摻雜金屬的二氧化鈦。據推測，添加金屬可以減少電子-空穴複合的可能性並提高活性。 X射線衍射、比表面積和孔隙率分析儀、透射電子顯微鏡和高分辨率透射電子顯微鏡用於表徵催化劑的粒徑、比表面積、孔體積、孔徑大小、形態和金屬分佈。結果表明，二氧化鈦的粒徑和形態沒有發生顯著變化且金屬均勻分散在二氧化鈦的表面上。亞甲基藍可以用於測試在紫外線照射下的光降解活性。通過UV /可見光/ NIR分光光度計測定水中亞甲基藍的濃度。結果表明，合適的金屬含量和鍛燒溫度可以有效地提高二氧化鈦的光降解效率。鈀和銅均在煅燒溫度為300℃及金屬含量為0.5 wt.％具有最高的光分解活性。TiO2的活性隨反應溫度的升高而增加。在0-50°C下，Pd /TiO2表現出相同的趨勢。但是當溫度高達70°C時，TiO2¬的反應速率略為下降，而Pd/TiO2變得最差。與其他溫度相比，Cu/TiO2則在室溫下的活性更高。

摘要(英)

The aim of this study was to investigate the effects of Pd and Cu co-catalyst on the photocatalytic activity of TiO2. The doped metal on the TiO2 was prepared by incipient-wetness impregnation method. It was hypothesized that adding metal can reduce the possibility of electron-hole recombination and improve activity. X-ray diffraction, specific surface and porosimetry analyzer, transmission electron microscopy, and high-resolution transmission electron microscopy were used to characterize the particle size, specific surface area, pore volume, pore size, morphology, and metal distribution of the catalysts. The results show that the particle size and morphology of TiO2 did not change significantly, as expected. The metal was uniformly dispersed on the surface of TiO2. Methylene blue was used to test the photodegradation activity under UV light irradiation. The concentration of methylene blue in water was determined by UV/Visible/NIR spectrophotometer. The results show that the suitable metal content and calcination temperature could effectively increase the photodegradation efficiency of TiO2. The calcining temperature of 300 ℃ and the palladium and copper metal content of 0.5 wt.% had the highest photodecomposition activity among all samples. At 0-50°C, the activity of TiO2 and Pd /TiO2 increases with the increase of reaction temperature. But when the temperature is as high as 70°C, the reaction rate of TiO2 drops slightly, and Pd/TiO2 becomes the worst. Cu/TiO2 is more active at room temperature than other temperatures.

關鍵字(中)

★ 光觸媒
★ 二氧化鈦
★ 鈀
★ 銅
★ 含浸法
★ 光催化降解

關鍵字(英)

★ Photocatalyst
★ Titanium dioxide
★ Pd-doping
★ Cu-doping
★ Impregnation method
★ Photocatalytic degradation

論文目次

中文摘要 1
Abstract 2
Acknowledgements 3
Table of Contents 3
List of Tables 6
List of Figures 7
Chapter 1 Introduction 1
Chapter 2 Literature review 3
2.1 Titanium dioxide (TiO2) photocatalysis 3
2.1.1 Polymorphs of TiO2 3
2.1.2 Mechanism of TiO2 photocatalysis 6
2.2 Modification of TiO2 photocatalysis 10
2.3 Palladium catalyst 11
2.4 Copper catalyst 15
2.5 Impregnation method 18
Chapter 3 Experimental 19
3.1 Materials 19
3.2 Catalysts preparation 19
3.2.1 Synthesis of Cu/ TiO2 19
3.2.2 Synthesis of Pd/TiO2 powders 20
3.3 Catalysts characterization 21
3.3.1 X-Ray Diffraction (XRD) 21
3.3.2 Specific surface and porosimetry analyzer (ASAP) 23
3.3.3 Transmission Electron Microscopy (TEM) and High-Resolution Transmission Electron Microscopy (HRTEM) 23
3.4 UV/Visible/NIR Spectrophotometer 24
3.5 Photocatalytic activity under UV light irradiation 24
Chapter 4 Photoactivity of Pd/TiO2 27
Abstract 27
4.1 Introduction 27
4.2 Results and discussion 28
4.2.1 Characterization of Pd/TiO2 powders 28
4.2.2 Photocatalytic degradation of methylene blue aqueous solution 37
4.2.3 The effect of reaction temperatures 44
4.3 Conclusions 49
Chapter 5 Photoactivity of Cu/TiO2 51
Abstract 51
5.1 Introduction 51
5.2 Results and discussion 52
5.2.1 Characterization of Cu/TiO2 powders 52
5.2.2 Photocatalytic degradation of methylene blue aqueous solution 60
5.2.3 The effect of reaction temperatures 68
5.3 Conclusions 70
Chapter 6 Comparison of the Effects of Pd and Cu Cocatalysts on the Photocatalytic Activity of TiO2 72
Chapter 7 Summary 76
References 78

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指導教授

陳郁文(Yu-Wen Chen)

審核日期

2021-7-2

推文