微/纳米结构三氧化钨和复合材料的可控合成及其复合增强的光学和光催化性能

发布时间：2024-03-07 01:31

　　过渡金属氧化物因电子、化学、机械等方多面性能而备受关注。过渡金属半导体材料WO3具有优异的物理、化学性能,在可再生能源和相关领域有很大的发展前景。纳米/微米结构的WO3光催化材料被认为是光解水和光催化降解有机污染物的重要材料之一。本文采用简单的水热合成法和CVD法制备WO3及其化合物WO3/g-C3N4, WO3/CdWO4和WO3/Fe2(WO4)3.10.7H2O等,通过X射线衍射、场发射电子扫描电镜、透射电镜、高分辨透射电镜、X射线电子能谱、紫外可见吸收光谱、荧光光谱、傅里叶转换红外光谱的方式进行表征,研究所制备材料优异的光学和光催化性能。文章第一部分的研究内容为WO3新型结构的制备及其光学性能的研究。以钨酸钠和氯化钠作为前躯体,利用表面活性剂/无催化剂的方法合成具有三维结构的wO3八面体结构。通过FESEM电镜对制得样品尺寸进行观察,发现所制备样品尺寸在1到5μm左右。文中对紫外可见光吸收、荧光吸收、和傅里叶红外吸收等光学性质进行了详细的说明。对制备样品在可见光下进行甲基蓝降解测试,发现所得样品暴露的{120}面有很大的比表面积(15.26 m2g-1),良好的结晶度和更多的表...

【文章页数】：181 页

【学位级别】：博士

【文章目录】：
Abstract
摘要
List of Symbols and Abbreviations
Chapter 1 Introduction
    1.1 An Overview
    1.2 Background of Photocatalysis
    1.3 Photocatalytic Degradation Process
    1.4 Some Applications of Photocatalysis
        1.4.1 Air Pollution
        1.4.2 Dyes
        1.4.3 Water Disinfection
    1.5 Photocatalytic Materials
    1.6 Tungsten Trioxide Oxide
        1.6.1 Physicochemical Properties and Structure
        1.6.2 Applications
    1.7 Methods to Enhance the Photocatalytic Performance
        1.7.1 Heterojunction
    1.8 Fabrication Techniques for WO3

        1.8.1 The Employed Characterization Techniques
    1.9 Significance of Current Research and Thesis Organization
Chapter 2 Synthesis of three-dimensional WO₃ Octahedra:Characterization,Optical and Efficient Photocatalytic Properties
    2.1 Introduction
    2.2 Experimental Procedure
        2.2.1 Fabrication of WO₃ Octahedra
        2.2.2 Characterizations
        2.2.3 Photocatalytic Activity Measurement
    2.3 Results and Discussion
        2.3.1 Morphological Characterization
        2.3.2 XPS Analysis
        2.3.3 FTIR and BET Surface Area
        2.3.4 Optical Properties
        2.3.5 Photocatalytic Property of WO₃ Octahedra
    2.4 Conclusions
Chapter 3 The Synergistic Effect between WO₃ and g-C₃N₄ towards Efficient visible-light-driven Photocatalytic Performance
    3.1 Introduction
    3.2 Experimental Section
        3.2.1 Fabrication of WO₃/g-C₃N₄

        3.2.2 Characterizations
        3.2.3 Photocatalytic Test
    3.3 Results and Discussion
        3.3.1 Phase Characterization and Morphology
        3.3.2 FTIR Analysis
        3.3.3 Optical Absorption Properties
        3.3.4 Evaluation of Photocatalytic Activity
        3.3.5 Proposed Mechanism for Enhance Photocatlytic Performance ofWO₃/gC₃N₄

    3.4 Conclusions
Chapter 4 A Novel Z-Scheme WO₃/CdWO₄ Photocatalyst with Enhanced visible-lightPhotocatalytic Activity for the Degradation of Organic Pollutants
    4.1 Introduction
    4.2 Experimental Details
        4.2.1 Fabrication of WO₃/CdWO₄ Photocatalyst
        4.2.2 Characterizations
        4.2.3 Measurement of Photocatalytic Activity
    4.3 Results and Discussion
        4.3.1 Phase Structures and Morphology
        4.3.2 FTIR Analysis and BET Surface Area Measurements
        4.3.3 Optical Absorption Properties
        4.3.4 Photocatalytic Properties
        4.3.5 Kinetic
        4.3.6 Possible Mechanism for Enhanced Photocatalytic Activity of Z-schemeWO₃/CdWO₄ Photocatalyst
    4.4 Conclusions
Chapter 5 A Facile One-Step Fabrication of Novel WO₃/Fe₂(WO₄)₃.10.7H₂OPorousMicroplates with Remarkable PhotocatalyticActivities
    5.1 Introduction
    5.2 Experimental Method
        5.2.1 Materials
        5.2.2 Synthesis of WO₃/Fe₂(WO₄)₃.10.7H₂O Porous Microplates
        5.2.3 Characterizations
        5.2.4 Photocatalytic Test
        5.2.5 Detection of Hydroxyl Radicals
    5.3 Results and Discussion
        5.3.1 Phase Characterization and Morphology
        5.3.2 XPS Analysis
        5.3.3 FTIR Analysis and BET Surface Area
        5.3.4 Optical Absorption and PL Spectra
        5.3.5 Evaluation of Photocatalytic Properties
        5.3.6 The Explanation for Enhanced Photocatalytic Activity
    5.4 Conclusions
Chapter 6 Conclusions and Outlook
    6.1 The Conclusions and Novel Features of Current Research
    6.2 The Directions for Future Work
References
Acknowledgement
List of Published and Accepted Papers



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