過渡金屬氧化物因電子、化學、機械等方多面性能而備受關(guān)注。過渡金屬半導體材料WO3具有優(yōu)異的物理、化學性能,在可再生能源和相關(guān)領域有很大的發(fā)展前景。納米/微米結(jié)構(gòu)的WO3光催化材料被認為是光解水和光催化降解有機污染物的重要材料之一。本文采用簡單的水熱合成法和CVD法制備WO3及其化合物WO3/g-C3N4, WO3/CdWO4和WO3/Fe2(WO4)3.10.7H2O等,通過X射線衍射、場發(fā)射電子掃描電鏡、透射電鏡、高分辨透射電鏡、X射線電子能譜、紫外可見吸收光譜、熒光光譜、傅里葉轉(zhuǎn)換紅外光譜的方式進行表征,研究所制備材料優(yōu)異的光學和光催化性能。文章第一部分的研究內(nèi)容為WO3新型結(jié)構(gòu)的制備及其光學性能的研究。以鎢酸鈉和氯化鈉作為前軀體,利用表面活性劑/無催化劑的方法合成具有三維結(jié)構(gòu)的wO3八面體結(jié)構(gòu)。通過FESEM電鏡對制得樣品尺寸進行觀察,發(fā)現(xiàn)所制備樣品尺寸在1到5μm左右。文中對紫外可見光吸收、熒光吸收、和傅里葉紅外吸收等光學性質(zhì)進行了詳細的說明。對制備樣品在可見光下進行甲基藍降解測試,發(fā)現(xiàn)所得樣品暴露的{120}面有很大的比表面積(15.26 m2g-1),良好的結(jié)晶度和更多的表...

【文章頁數(shù)】：181 頁

【學位級別】：博士

【文章目錄】：
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



本文編號：3921184

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