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研究生： NOTO SUSANTO GULTOM
NOTO - SUSANTO GULTOM
論文名稱： Facile Synthesis of Indium Oxysulfide Photocatalyst for Hexavalent Chromium Detoxification and Hydrogen Evolution
Facile Synthesis of Indium Oxysulfide Photocatalyst for Hexavalent Chromium Detoxification and Hydrogen Evolution
指導教授： 郭東昊
Dong-Hau Kuo
口試委員: 何清華
Ching-Hwa Ho
薛人愷
Ren-Kae Shiue
學位類別： 碩士
Master
系所名稱： 工程學院 - 材料科學與工程系
Department of Materials Science and Engineering
論文出版年： 2017
畢業學年度： 105
語文別： 英文
論文頁數： 103
中文關鍵詞： -
外文關鍵詞： Indium oxysulfide, photocatalyst.
相關次數： 點閱：195  下載：2 
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    • Material design with solid solution concept is one of the best strategies to obtain efficient visible light photocatalyst. In this work, we designed photocatalyst by combining the wide band gap In2O3 with the narrow band gap In2S3 to form a solid solution indium oxysulfide (In2(O,S)3). It had been successfully synthesized by a simple chemical precipitation method at low temperature, below 100 ᵒC. Furthermore, the as-prepared In2(O,S)3 was annealed in air at different temperatures of 350, 400, and 450oC for 2 h. For further study and comparison, the In2(O,S)3 was prepared with different types of indium precursors and different molar ratios between indium chloride and thioacetamide. The morphology changed from nanosheet to nanoparticle and its phase from oxysulfide to oxide at higher annealing temperature. Interestingly, the band gap value of In2(O,S)3 solid solution located between those of In2S3 and In2O3. All the as-prepared and annealed photocatalysts were carefully characterized and examined toward photocatalytic hexavalent chromium (Cr(VI)) reduction. We found that 90 ᵒC-prepared In2(O,S)3 exhibited the greatest photocatalytic reduction of Cr(VI) under visible light illumination without using any hole scavenger reagent. After depositing Ag nanoparticles on In2(O,S)3, the photocatalytic hydrogen evolution was dramatically improved. Depositing 5 % Ag, In2(O,S)3 showed the highest activity with a yield of 400 μmole/g hydrogen gas in ethanol solution under 150 W Xe lamp irradiation for 5 h. The great performance of 90 ᵒC-prepared In2(O,S)3 was due to the formation of solid solution which significantly enhanced the visible light absorbance. The photocatalytic activities and their mechanisms of 90 ᵒC-prepared In2(O,S)3 were evaluated and elaborated in this work.

    Abstract i Table of contents ii List of figures v List of equation x List of tables xi CHAPTER 1 INTRODUCTION 1 1.1 Research background 1 1.2 Photocatalytic reduction chromium 3 1.3 Hydrogen production 4 1.3.1 Photocatalytic water splitting 5 1.3.1 Working mechanism photocatalytic water splitting 6 1.4 Research objective 7 CHAPTER 2 BASIC THEORY AND LITERATURE REVIEW 9 2.1 Photocatalyst semiconductor 9 2.2 Approaches for charges separation 10 2.2.1 Loading co-catalyst 11 2.2.2 Indtroducing sacrificial reagents 11 2.2.2 P-n junction 13 2.3 Solid solution 14 2.4 Literature review 15 2.4.1 Photocatalyst based on solid solution 15 2.4.1.1 (Ga1-xZnx)(N1-xOx) photocatalyst 15 2.4.1.2 (CuIn)xZn2(1-x)S2 photocatalyst 17 2.4.1.3 Cd1-xZnxS photocatalyst 20 2.4.1.4 Tantalum oxynitride (TaON) 23 2.4.2 Photocatalytic of reduction hexavalent chromium 25 2.4.2.1 ZnO nanorods 25 2.4.2.2 TiO2 photocatalyst 26 2.4.2.3 SnS2/SnO2 composite 28 2.4.2.4 SnIn4S8 flower-like microspheres 30 CHAPTER 3 EXPERIMENTAL PROCEDURES 32 3.1 Synthesis of indium oxysulfide solid solution 32 3.1.1 Materials 32 3.1.2 Samples preparation 32 3.1.3 Depositing of Ag nanoparticle on In2(O,S)3 33 3.2 Chacterizations 33 3.2.1 X-ray diffractometry (XRD) 33 3.2.2 Scanning electron microscopy (SEM) 34 3.2.3 Transmission electron microscopy (TEM) 36 3.2.4 Diffuse reflectance spectra (DRS) 38 3.2.5 X-ray photoelectron spectroscopy (XPS) 39 3.2.6 Gas chromatography (GC) 41 3.3 Photocatalytic activity test 43 3.3.1 Photocatalytic reduction of Cr (VI) 43 3.3.2 Photocatalytic hydrogen production 35 CHAPTER 4 RESULTS AND DISCUSSION 45 4.1 Influence of temperature 45 4.2 Influence of In/TAA molar ratio 55 4.3 Influence of precurssor 60 4.4 Ag deposition on In2(O,S)3 63 4.5 Photocatalytic reusibility 67 4.5 Photocatalytic mechanism 74 CHAPTER 5 CONCLUSION 78 REFERENCES 80 APPENDIXS 86

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