铋酸钠基钙钛矿型功能材料的可见光催化/直接氧化降解典型有机水相染料研究

发布时间：2023-11-14 19:08

　　可溶性有机染料的广泛生产和使用不可避免的导致了水体环境中的染料污染,对人类和生态健康产生潜在威胁。面对不断涌现的环境问题,当务之急是采取有效措施消除降解有机染料废水中的污染物。传统的降解技术处理有机水相染料污染效率较低,因此开发高效的处理技术正迅速成为一大研究热点。本论文建立了铋酸钠可见光光催化,铋银氧化物直接氧化与可见光催化/直接氧化联用降解水体有机染料等方法。这些基于铋酸钠型功能材料的降解方法成本低、简单易行,同时实现了对典型有机水相染料的高效、深度降解。 以罗丹明B作为模式染料研究铋酸钠的可见光催化活性以及罗丹明B的降解行为。1g/L铋酸钠在可见光照射下30分钟内将20mg/L罗丹明B溶液完全脱色,假一级反应速率常数为0.124min-1。染料溶液紫外可见吸收光谱在降解过程中有一定蓝移,最大吸收峰波长从554nm降至534nm。铋酸钠加热温度显著影响其光催化反应活性,未加热的铋酸钠样品活性最高。重复5次降解罗丹明B溶液结果显示铋酸钠有较高的光催化稳定性。检测出罗丹明B所有脱乙基产物与多种小分子产物。其中两种脱乙基同分异构体产物生成量区别很大,推测原因为降解过程中罗丹明B分子两侧电...

【文章页数】：185 页

【学位级别】：博士

【文章目录】：
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
学位论文中文概述
附录 攻读博士学位期间主要成果



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