揮發(fā)性有機(jī)物（volatile organic compounds,VOCs）是微環(huán)境中常見的污染物,如何有效去除揮發(fā)性有機(jī)物是改善微環(huán)境空氣品質(zhì)的難點(diǎn)。光催化可以降解絕大多數(shù)VOCs,但反應(yīng)速率慢、催化劑易于失活。185 nm真空紫外光（vacuum ultraviolet,VUV）催化對(duì)污染物有更高的去除速率,但會(huì)帶來臭氧副產(chǎn)物問題。本文嘗試對(duì)二氧化鈦（Ti O2）進(jìn)行改性,包括在Ti O2負(fù)載鈀（Pd）納米顆粒以及活性面{001}暴露率高的Ti O2,考察改性Ti O2在185 nm真空紫外光下同步催化去除甲苯及臭氧的性能,并在中試規(guī)模下評(píng)價(jià)Pd-Ti O2對(duì)低濃度甲苯的去除性能及其實(shí)際應(yīng)用可行性。采用低溫靜電自組裝方法在Ti O2膜上負(fù)載Pd納米顆粒,研究Pd-Ti O2在VUV下同步催化分解甲苯及去除副產(chǎn)物臭氧的性能及其機(jī)理。Pd納米粒子通過靜電作用在Ti O2膜表面均勻沉積,浸漬時(shí)間影響Pd納米粒子的分散度及數(shù)量密度。在浸漬時(shí)間10min獲得的Pd-Ti O2因具有較小的平均粒徑（3.0 nm）和較高的數(shù)量密度（6.67×1011 cm-2）,從而表現(xiàn)出最佳的甲苯和臭氧去除... 

【文章來源】：清華大學(xué)北京市 211工程院校 985工程院校 教育部直屬院校

【文章頁數(shù)】：117 頁

【學(xué)位級(jí)別】：博士

【文章目錄】：
摘要
Abstract
Abbreviations
Chapter 1 Literature reviews and research objectives
    1.1 Introduction
    1.2 VOCs pollution and control technologies
        1.2.1 Indoor VOCs pollution
        1.2.2 VOCs control technologies
    1.3 Photocatalysis for VOCs degradation
    1.4 TiO_2 photocatalyst and its modification
        1.4.1 Brief introduction of TiO_2 photocatalyst
        1.4.2 Synthesis and modification of TiO_2
    1.5 Research objectives and contents
        1.5.1 Research objectives
        1.5.2 Research contents
Chapter 2 Preparation of Pd-TiO_2 and their photocatalytic property
    2.1 Introduction
    2.2 Experimental section
        2.2.1 Preparation of the Pd-TiO_2 films on the Ti sheet
        2.2.2 Characterization of as-prepared catalysts
        2.2.3 Evaluation of catalytic activities for toluene and ozone removal under 185 nmVUV light
        2.2.4 Sampling and analysis
    2.3 Results and discussions
        2.3.1 Structure and morphology of Pd-TiO_2 films
        2.3.2 Effect of Pd dispersion on the activity of Pd-TiO_2
        2.3.3 The activity of Pd-TiO_2 over a range of toluene concentrations
        2.3.4 Formation of intermediates, CO_2 and CO during toluene degradation
    2.4 Chapter summary
Chapter 3 Synthesis and its photocatalytic activity of Ti O2 with dominantexposure of {001} facets
    3.1 Introduction
    3.2 Experimental section
        3.2.1 Preparation of catalysts
        3.2.2 Characterization of catalysts
        3.2.3 Evaluation of activity for toluene and ozone removal
        3.2.4 Sampling and analysis
    3.3 Results and discussion
        3.3.1 Effect of fluorine on the activity of {001}TiO_2
        3.3.2 Effect of p H values on the activity of {001}TiO_2
        3.3.3 Effect of Pd deposition on the activity of {001}TiO_2
        3.3.4 Comparison of activities of different TiO_2 catalysts
    3.4 Chapter summary
Chapter 4 Evaluation of VUV photocatalysis in a pilot scale system
    4.1 Introduction
    4.2 Experimental section
        4.2.1 Pilot-scale photocatalytic system
        4.2.2 Preparation of Pd-TiO_2 catalysts
        4.2.3 Layout of Pd-TiO_2 and operation parameters
    4.3 Results and discussion
        4.3.1 Comparison of catalysts with different configurations
        4.3.2 Performance of the pleated Pd-TiO_2 catalyst
        4.3.3 Discussion
    4.4 Chapter summary
Chapter 5 Conclusions and suggestions
    5.1 Conclusions
    5.2 Suggestions
References
Acknowledgement
Curriculum vitae


【參考文獻(xiàn)】：
期刊論文
[1]Screening study of transition metal oxide catalysts supported on ceria-modified titania for catalytic oxidation of toluene[J]. Dan-qing YU1,Yue LIU1,Zhong-biao WU1,2(1Department of Environmental Engineering,Zhejiang University,Hangzhou 310027,China)(2Zhejiang Provincial Engineering Research Center of Industrial Boiler & Furnace Flue Gas Pollution Control,Hangzhou 310027,China).  Journal of Zhejiang University-Science A（Applied Physics & Engineering）. 2011(06)
[2]Photocatalytic Oxidation of Aniline in the Gas Phase Using Porous TiO2 Thin Films[J]. Fa Wenjun,Li Ying,Gong Chuqing,Zhong Jiacheng College of Chemistry and Molecule Sciences,Wuhan University,Wuhan 430072,China.  Frontiers of Chemistry in China. 2006 (01)



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