Ca掺杂的CuBi 2 O 4 材料制备及其在刚果红可见光光催化降解中的应用

发布时间：2024-04-06 22:39

　　在本研究中,通过一步水热法成功地合成了纯相尖晶石型Ca掺杂的CuBi2O4氧化物(x=0.00,0.05,0.1,0.15)。用x射线衍射(XRD)对合成的纳米颗粒进行表征以研究材料的结晶度和颗粒大小。用场发射扫描电子显微镜(FESEM)对合成材料的形貌进行研究。采用能量色散X射线光谱仪(EDX)与场发射扫描电子显微镜(FESEM)对其化学组成和元素映射进行了研究。利用光致发光(PL)研究了电子空穴对的复合行为。用UV型可见漫反射分光光度计(DRS)测定了材料的吸收区。以在光照条件下去除水溶液中的有毒染料刚果红测试了该光催化剂的光催化活性。在所有合成的材料中,Ca0.1Cu.95Bi2O4降解效率最高,降解常数高,降解时间最短。纯CuBi2O4在辐照70分钟内降解染色刚果红效率为46%,而Ca0.1Cu0.95Bi2O4在照射70分钟内光降解率为82%。此外,研究了六种实验参数,包括辐照时间,催化剂用量,pH值,H2O2的影响,无机盐的影响以及搅拌速度对刚果红的降解效率的影响。结果表明,在0.6 mL H2O2的存在下,辐照60分钟内的最大光催化活性为94%。

【文章页数】：70 页

【学位级别】：硕士

【文章目录】：
学位论文数播集
Acknowledgment
ABSTRACT
摘要
CHAPTER 1 Introduction
    1.1 Introduction
    1.2 Literature review
    1.3 Photocatalysis
    1.4 Types of photocatalysis
        1.4.1 Homogenous photocatalysis
        1.4.2 Heterogeneous photo-catalysis
        1.4.3 Redox reaction in photo-catalysis
            1.4.3.1 The Oxidation reactions in heterogeneous photocatalysis
            1.4.3.2 The reduction reaction in heterogeneous photocatalysis
    1.5 Mechanism of photo-catalysis
    1.6 Hetero junction
        1.6.1 Types of Heterojunction
            1.6.1.1 Type Ⅰ heterojunction
            1.6.1.2 Type Ⅱ heterojunction
            1.6.1.3 p-n heterojunction
            1.6.1.4 Schottky heterojunction
            1.6.1.5 Z-scheme heterojunction
            1.6.1.6 Elemental doping
    1.7 Nanoparticle
    1.8 Nanoparticles used in research
        1.8.1 CuBi₂O₄ and Ca doped CuBi₂O4

            1.8.1.1 Crystallographic parameter of CuBi₂O₄

            1.8.1.2 Structure of CuBi₂O₄

    1.9 Congo red
        1.9.1 Properties of Congo red
        1.9.2 The Structure of Congo red
        1.9.3 Congo red at different pH
        1.9.4 Advantages of Congo red
        1.9.5 Disadvantages
    1.10 Objectives of our work
CHAPTER 2 Experimental and Results
    2.1 EXPERIMENTAL AND RESULTS
        2.1.1 Chemicals
        2.1.2 Instruments and Equipment
            2.1.2.1 Morphological characterization
            2.1.2.2 The X-ray diffraction
            2.1.2.3 Photo-luminescence Analysis
            2.1.2.4 UV-visible diffuse reflectance spectroscopy (DRS) Analysis
            2.1.2.5 UV-visible analysis
        2.1.3 Preparation of CuBi₂O₄

            2.1.3.1 Reaction mechanism
        2.1.4 Synthesis of Ca_xCu(1-x)Bi2O₄

        2.1.5 Preparation of Congo red dye solution
            2.1.5.1 Preparation of stock solution
            2.1.5.2 Preparation of standard solution
        2.1.6 Determination of maximum wavelength (λ max) for congo red at pH 7
        2.1.7 Calibration curve or standard Calibration of congo red solution
        2.1.8 Determination of percentage degradation of Congo red by using CuBi₂O₄

    2.2 Characterization
        2.2.1 The Powder x-ray diffraction (PXRD) analysis
        2.2.2 Morphological analysis (Scanning electron microscopy)
        2.2.3 Energy dispersive x-ray electron microscopy (EDS) Analysis and elementalmapping
        2.2.4 Photoluminescence (PL) spectra of CuBi₂O₄ and Ca_0.1Cu_0.9Bi₂O₄

        2.2.5 UV-visible diffuse reflection spectrum (DRS) characterization
        2.2.6 Band gap energy of CuBi₂O₄ and Ca_xCu_1-xBi₂O₄

    2.3 Photocatalytic activity
        2.3.1 Photocatalytic degradation of congo red by CuBi₂O₄ and Ca_xCu_1-xBi₂O₄

        2.3.2 Effect of catalyst amount on photocatalytic degradation of congo red
        2.3.3 Effect of initial concentration on photocatalytic degradation of Congo red
        2.3.4 Effect of pH on photocatalytic degradation of Congo red
        2.3.5 Effect of H₂O₂ on photocatalytic decomposition of Congo red
        2.3.6 Effect of agitation speed
        2.3.7 Effect of inorganic salts on photocatalytic degradation of Congo red
            2.3.7.1 Effect of sodium chloride NaCl
            2.3.7.2 Effect of Na₂SO₄ on photocatalytic degradation of Congo red
        2.3.8 Reusibility or Number of cycle
CHAPTER 3 Conclusion
    3.1 CONCLUSION
    3.2 Outlook
REFRENCES
硕士研究生学位论文答辩委员会决议书



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