可溶性有機染料的廣泛生產(chǎn)和使用不可避免的導(dǎo)致了水體環(huán)境中的染料污染,對人類和生態(tài)健康產(chǎn)生潛在威脅。面對不斷涌現(xiàn)的環(huán)境問題,當務(wù)之急是采取有效措施消除降解有機染料廢水中的污染物。傳統(tǒng)的降解技術(shù)處理有機水相染料污染效率較低,因此開發(fā)高效的處理技術(shù)正迅速成為一大研究熱點。本論文建立了鉍酸鈉可見光光催化,鉍銀氧化物直接氧化與可見光催化/直接氧化聯(lián)用降解水體有機染料等方法。這些基于鉍酸鈉型功能材料的降解方法成本低、簡單易行,同時實現(xiàn)了對典型有機水相染料的高效、深度降解。 以羅丹明B作為模式染料研究鉍酸鈉的可見光催化活性以及羅丹明B的降解行為。1g/L鉍酸鈉在可見光照射下30分鐘內(nèi)將20mg/L羅丹明B溶液完全脫色,假一級反應(yīng)速率常數(shù)為0.124min-1。染料溶液紫外可見吸收光譜在降解過程中有一定藍移,最大吸收峰波長從554nm降至534nm。鉍酸鈉加熱溫度顯著影響其光催化反應(yīng)活性,未加熱的鉍酸鈉樣品活性最高。重復(fù)5次降解羅丹明B溶液結(jié)果顯示鉍酸鈉有較高的光催化穩(wěn)定性。檢測出羅丹明B所有脫乙基產(chǎn)物與多種小分子產(chǎn)物。其中兩種脫乙基同分異構(gòu)體產(chǎn)物生成量區(qū)別很大,推測原因為降解過程中羅丹明B分子兩側(cè)電...

【文章頁數(shù)】：185 頁

【學位級別】：博士

【文章目錄】：
ABSTRACT
摘要
ACKNOWLEDGMENTS
TABLE OF CONTENTS
NOMENCLATURE
LIST OF FIGURES
LIST OF TABLES
Chapter 1 THEORY AND LITERATURE REVIEW
    1.1 Dye Pollution
    1.2 Treatment for Aqueous Dye Removal
        1.2.1 Physical methods for dye removal
        1.2.2 Biological methods for dye removal
        1.2.3 Chemical methods for dye removal
            1.2.3.1 Direct chemical oxidations
            1.2.3.2 Advanced oxidation processes
            1.2.3.3 Combined approaches
    1.3 Perovskite Oxide
        1.3.1 Ideal perovskite structure
        1.3.2 Perovskite structure family
        1.3.3 Sodium bismuthate
            1.3.3.1 Application in chemical synthesis
            1.3.3.2 Application in environment
    1.4 Objective of This Study
    1.5 References
Chapter 2 VISIBLE LIGHT-DRIVEN PHOTOCATALYTIC DEGRADATION OF RHODAMINEB OVER SODIUM BISMUTHATE
    2.1 Experimental Method
        2.1.1 Materials and reagents
        2.1.2 Photoreaction chamber
        2.1.3 Characterization
        2.1.4 Photodegradation of RhB
        2.1.5 Analytical methods
    2.2 Results and Discussion
        2.2.1 RhB degradation
            2.2.1.1 UV-Visible spectra
            2.2.1.2 Reactivity comparison
            2.2.1.3 Stability
        2.2.2 Influence factors
            2.2.2.1 SBH concentration
            2.2.2.2 Crystal water content
        2.2.3 Reaction intermediates
        2.2.4 Mechanism
    2.3 Conclusion
    2.4 References
Chapter 3 DIRECT OXIDATIVE DEGRDATION OF RHODAMINE B USING BISMUTHSILVER OXIDE
    3.1 Experimental Method
        3.1.1 Materials and reagents
        3.1.2 BSO preparation
        3.1.3 BSO characterization
        3.1.4 RhB degradation
        3.1.5 Analytical methods
    3.2 Results and Discussion
        3.2.1 BSO characterization
        3.2.2 RhB degradation
        3.2.3 Influence factors
            3.2.3.1 SBH and AgNO₃ amount
            3.2.3.2 BSO dosage
        3.2.4 BSO durability
        3.2.5 BSO corrosion
            3.2.5.1 XRD analysis
            3.2.5.2 FTIR analysis
            3.2.5.3 XPS analysis
            3.2.5.4 TEM analysis
        3.2.6 Active oxygen species analysis
        3.2.7 Mechanism
        3.2.8 Versatility
    3.3 Conclusion
    3.4 References
Chapter 4 DEGRADATION OF ORGANIC DYES VIA BISMUTH SILVER OXIDE INITIATEDDIRECT OXIDATION COUPLED WITH SODIUM BISMUTHATE BASED VISIBLE LIGHTPHOTOCATALYSIS
    4.1 Experimental Method
        4.1.1 Materials and reagents
        4.1.2. Combined process of direct oxidation and visible light photocatalysis
            4.1.2.1 Direct oxidation(DO)
            4.1.2.2 Visible light photocatalysis(PC)
        4.1.3 Analytical methods
    4.2 Results and Discussion
        4.2.1 Comparison of DO and PC
            4.2.1.1 UV-Vis spectra
            4.2.1.2 Intermediates
            4.2.1.3 Mechanisms
            4.2.1.4 Decolorization performance
        4.2.2 Combined processes
            4.2.2.1 Crystal violet
            4.2.2.2 Versatility
            4.2.2.3 Durability
            4.2.2.4 Mechanism
    4.3 Conclusion
    4.4 References
Chapter 5 PRELINIARY INVESTIGATION ON DEGRADATION OF MALACHITE GREENUSING COPPER DOPED SODIUM BISMUTHATE
    5.1 Experimental Method
        5.1.1 Materials and reagents
        5.1.2 CSB preparation
        5.1.3 CSB characterization
        5.1.4 MG degradation
        5.1.5 Analytical methods
    5.2 Results and Discussion
        5.2.1 CBS characterization
        5.2.2 MG degradation
        5.2.3 Influence factors
            5.2.3.1 Ratio of raw material
            5.2.3.2 CSB concentration
            5.2.3.3 MG concentration
            5.2.3.4 pH value
        5.2.4 CSB corrosion
    5.3 Conclusion
    5.4 References
Chapter 6 CONCLUSIONS AND PROSPECTS
    6.1 Conclusions
    6.2 Prospects
學位論文中文概述
附錄 攻讀博士學位期間主要成果



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