本文采用植物化學(xué)方法來制備了銀納米顆粒(Ag-NPs),以此為基礎(chǔ)制備了一種新型電化學(xué)傳感器,用于檢測(cè)水中的亞硝酸根離子(NO2-)。首先,使用龍眼種子的水溶液提取物作為穩(wěn)定劑和還原劑來制備Ag-NPs。采用多種方法進(jìn)行表征,包括:利用紫外-可見吸收光譜(Uv/vis)對(duì)Ag-NPs的形成和生長過程進(jìn)行了表征;通過X射線衍射(XRD),證實(shí)了 Ag-NPs為面心立方結(jié)構(gòu);通過掃描電子顯微鏡(SEM)確定了其微觀形態(tài);通過透射電子顯微鏡(TEM)測(cè)定了 Ag-NPs的尺寸,結(jié)果表明其粒度在2-20nm范圍內(nèi)。隨后,將制備得到的Ag-NPs與石墨粉混合,通過浸漬法以石墨片為基底制備了銀納米顆粒復(fù)合修飾電極(Ag-NPs modified electrode)。該電極對(duì)水溶液中亞硝酸根離子的氧化過程具有明顯的電催化活性。與未修飾的石墨電極相比,在檢測(cè)水溶液中亞硝酸根離子過程中,該電極具有較高的峰電流密度和較低的氧化電位。結(jié)果表明,使用該銀納米顆粒復(fù)合修飾電極(Ag-NPs modified electrode)檢測(cè)水溶液中亞硝酸根離子時(shí),在0.85V的電位下出現(xiàn)較強(qiáng)的氧化峰;在亞硝酸根濃度為...

【文章頁數(shù)】：91 頁

【學(xué)位級(jí)別】：碩士

【文章目錄】：
學(xué)位論文數(shù)據(jù)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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