碳氮共修饰Nb 2 O 5 的合成及其可见光下催化降解RhB的活性评价

发布时间：2021-10-25 23:02

　　非均相光催化和基于半导体的光催化过程在最近几年受到全球范围的广泛关注,包括太阳能光催化水解产氢以及通过光降解污染物处理废气和废水等有前景的应用。在近几年中,科学家们已经研究了大量的半导体材料,其中二氧化钛因其化学稳定性,低成本和无毒性而被证明是最佳选择之一。然而,其广泛的实际应用主要限制于转换效率低以及可靠性差等。此外,电子-空穴复合的焦点问题依然没有得到解决。因此,我们的工作主要集中在寻找有效的半导体材料作为二氧化钛的替代品。本论文工作主要目的是设计和制备具有良好性能的半导体材料,该材料可以利用可见光来进行光催化反应,包括水中有机化合物的降解。这样做时,废水中的污染物的消除等生态问题也可以得到有效的解决。所采用的办法是利用可行的方法制备在紫外光下具有活性的高表面积材料,然后通过表面修饰的方法使得材料对可见光响应。本论文以草酸铌作为前驱体,以2-甲基咪唑（Hmim）同时作为结构导向剂以及氮和碳的来源,通过水热-煅烧过程成功地合成了碳,氮共修饰的氧化铌纳米线。采用扫描电子显微镜（SEM）,透射电子显微镜（TEM）,X射线粉末衍射（XRD）,X射线光电子能谱（XPS）,傅里叶变换红外光谱（... 

【文章来源】：天津大学天津市 211工程院校 985工程院校 教育部直属院校

【文章页数】：78 页

【学位级别】：硕士

【文章目录】：
Abstract
摘要
Chapter Ⅰ introduction and literature reviews
    1.1 Introduction
    1.2 Overview of Photocatalytic Reaction Research
        1.2.1 Principles of Photocatalysis
        1.2.2 Catalyst Structure
        1.2.3 Photocatalytic reaction mechanism
        1.2.4 Semiconductor-type photocatalysts
        1.2.5 Niobium oxides Photocatalyst
        1.2.6 Modification of Nb_2O_5 for harvesting visible light
        1.2.7 Photocatalytic Applications
        1.2.8 Present status and issues
    1.3 The Aims of my research
    1.4 Dissertation outlines
Chapter Ⅱ Design and characterization techniques for Nb_2O_5 toward visible lightresponse
    2.1 Morphologies and surface areas of Nb_2O_5 crystals
    2.2 Band-gap change
    2.3 Characterization Techniques
        2.3.1 X-Ray Diffraction
        2.3.2 Electron microscope(EM)
        2.3.3 X-Ray Photoelectron Spectroscopy(XPS)
        2.3.4 Ultraviolet-visible diffuse reflectance spectroscopy
        2.3.5 Brunauere-Emmette-Teller(BET)
        2.3.6 Fourier-transform infrared spectroscopy(FT-IR)
Chapter Ⅲ Preparation and characterization of visible light excitedphotocatalysts from Nb_2O_5
    3.1 Experimental Materials
    3.2 Experimental Apparatus
    3.3 Preparation of C,N co-modified Nb_2O_5 nanowires
    3.4 Physical and chemical properties of as prepared photocatalysis
        3.4.1 Morphology and structure characterization
        3.4.2 Synthesis processes
    3.5 Optical and photo electrochemical properties of C,N co-modified Nb_2O_5
    3.6 XPS analysis
Chapter Ⅳ Photocatalytic performance in RhB degradation
    4.1 Experimental Materials
    4.2 Experimental Apparatus
    4.3 Photocatalytic activity experiment
    4.4 Results and Discussion
        4.4.1 Photocatalytic performance
        4.4.2 Photodegradation for RhB over C,N co-modified Nb_2O_5 nanowires aftercalcination at different temperature
        4.4.3 Stability of the catalyst
        4.4.4 Mechanism of the photocatalysis of C,N co-modified Nb_2O_5
Chapter Ⅴ Conclusion
References
Published Papers and joined Scientific Researches
    Published Papers
ACKNOWLEDGEMENTS



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