植物化学法合成银纳米粒子及其在亚硝酸盐离子检测中的应用

发布时间：2023-03-24 05:29

　　本文采用植物化学方法来制备了银纳米颗粒(Ag-NPs),以此为基础制备了一种新型电化学传感器,用于检测水中的亚硝酸根离子(NO2-)。首先,使用龙眼种子的水溶液提取物作为稳定剂和还原剂来制备Ag-NPs。采用多种方法进行表征,包括:利用紫外-可见吸收光谱(Uv/vis)对Ag-NPs的形成和生长过程进行了表征;通过X射线衍射(XRD),证实了 Ag-NPs为面心立方结构;通过扫描电子显微镜(SEM)确定了其微观形态;通过透射电子显微镜(TEM)测定了 Ag-NPs的尺寸,结果表明其粒度在2-20nm范围内。随后,将制备得到的Ag-NPs与石墨粉混合,通过浸渍法以石墨片为基底制备了银纳米颗粒复合修饰电极(Ag-NPs modified electrode)。该电极对水溶液中亚硝酸根离子的氧化过程具有明显的电催化活性。与未修饰的石墨电极相比,在检测水溶液中亚硝酸根离子过程中,该电极具有较高的峰电流密度和较低的氧化电位。结果表明,使用该银纳米颗粒复合修饰电极(Ag-NPs modified electrode)检测水溶液中亚硝酸根离子时,在0.85V的电位下出现较强的氧化峰;在亚硝酸根浓度为...

【文章页数】：91 页

【学位级别】：硕士

【文章目录】：
学位论文数据集
ABSTRACT
摘要
Abbreviations
Chapter 1 Research progress on the preparation of silver nanoparticles and its electrochemical detection ofnitrite ions
    1.1 Preparation and application of Ag nanoparticles
        1.1.1 Introduction of Ag nanoparticles
        1.1.2 Preparation of Ag NPs
        1.1.3 Application of Ag nanoparticles
    1.2 Research progress in electrochemical detection of nitrite ions
    1.3 Literature review of the nitrite ions
        1.3.1 Electrochemical detection of Nitrite ions (NO2
-) from the groundwater
    1.4 Aims and objectives of this thesis
Chapter 2 Experimental section
    2.1 Material method
        2.1.1 Chemicals
        2.1.2 Glasswares
    2.2 Plants Seeds extract preparation
    2.3 Preparation of silver nanoparticles (Ag-NPs)
    2.4 Fabrication of Ag-NPs modified GSE
    2.5 Characterization Techniques
        2.5.1 UV-Vis Spectroscopy
        2.5.2 TEM
        2.5.3 X-ray Diffraction (XRD)
        2.5.4 Scanning Electronic Microscopic (SEM)
        2.5.5 Energy Dispersive X-ray Spectroscopy
        2.5.6 FT-IR
    2.6 Electrochemical study of silver nanoparticles modified electrode
        2.6.1 Electrode potential
        2.6.2     Electrochemical system
        2.6.3 Supporting electrolyte
Chapter 3 Silver nanoparticles synthesized by using Dimocaarpuslongan seed extract as a reducing regent
    3.1 Results and discussion
        3.1.1 UV/visspectroscopy
        3.1.2 FT-IR analysis
        3.1.3 XRD analysis
        3.1.4 SEM analysis
        3.1.5 EDX analysis
        3.1.6 TEM the effect of Concentration on synthesized Ag-NPs
    3.2 Summary
Chapter 4 Electrochemical behaviors of the Ag-NPs electrode
    4.1 Fabrication of Ag-NPs electrode
    4.2 Setup of Electrochemical cell
    4.3 Result and discussion
        4.3.1 Cyclic voltammetry (CV) of the modified electrode El
        4.3.2 Cyclic voltammetry (CV) of the modified electrode E2
        4.3.3 The mechanism of nitrite detection on Ag-NPs electrode
    4.4 Summary
Chapter 5 Electrochemical detection of nitrite in stimulated water
    5.1 The standard addition method
    5.2 Current-time (I-t) curves
    5.3 Interference of coexisted ions to the detection of nitrite
    5.4 Reproducibility and stability
    5.5 Summary
Chapter 6 Conclusions
Acknowledgements
Resume of the Author
Resume of the Supervisor
List of Publications
References
附件



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