金纳米颗粒/沸石咪唑酯框架纳米复合材料修饰碳布的制备及电化学检测亚硝酸盐  

Gold Nanoparticles/Zeolitic Imidazolate Framework-67 Modified Carbon Cloth Electrode for Determination of Nitrite

作　　者：吴丽荣 肖然 庄贞静[2] WU Li-Rong;XIAO Ran;ZHUANG Zhen-Jing(Department of Pharmacy,Quanzhou Medical College,Quanzhou 362011,China;School of Biomedical Sciences,Huaqiao University,Quanzhou 362021,China)

机构地区：[1]泉州医学高等专科学校药学院,泉州362011 [2]华侨大学医学院,泉州362021

出　　处：《分析化学》2024年第12期1886-1895,共10页Chinese Journal of Analytical Chemistry

基　　金：泉州市自然科学基金项目(No.2023C021YR);泉州市科技计划项目(No.2021N129S)资助。

摘　　要：过量的亚硝酸盐会对生态环境及人类健康造成严重危害。本研究在碳布(CC)上设计并合成了具有三维结构的金纳米颗粒/沸石咪唑酯框架(AuNPs/ZIF-67)纳米复合材料,用于构建亚硝酸盐电化学传感器。首先在碳布上合成了交错生长的叶状ZIF-67纳米片,然后通过电沉积方法将AuNPs沉积在ZIF-67上,获得AuNPs/ZIF-67修饰的碳布(AuNPs/ZIF-67/CC)。采用扫描电镜(SEM)、X射线光电子能谱(XPS)、X射线衍射(XRD)和氮气吸脱附测试对其形貌、组成和比表面积等进行了表征。以AuNPs/ZIF-67/CC为工作电极,研究了亚硝酸根离子(NO_(2)^(–))的电化学行为。结果表明,AuNPs/ZIF-67将AuNPs的高催化性能与ZIF-67的形貌和结构优势相结合,显著提高了电极的比表面积和电催化活性;AuNPs/ZIF-67/CC电极对NO_(2)^(–)的氧化电位明显下降,氧化电流显著增加,显示出优异的响应性能。利用此电极采用循环伏安法(CV)检测NO_(2)^(–)的两段线性范围分别为0.005~5.0 mmol/L和5.0~24.0 mmol/L,检出限(LOD,3σ/S)为1.26μmol/L;采用计时安培法(i-t)检测NO_(2)^(–)的两段线性范围为1~800μmol/L和800~1800μmol/L,LOD(3σ/S)为0.08μmol/L。AuNPs/ZIF-67/CC具有良好的抗干扰性、重复性和稳定性,可用于实际样品中NO_(2)^(–)的检测。Excessive nitrite can cause serious harm to human health.In this work,gold nanoparticles/zeolitic imidazolate framework-67(Au NPs/ZIF-67)nanocomposite with three-dimensional structure was designed and synthesized on carbon cloth(CC),and a Au NPs/ZIF-67 modified CC electrode was then prepared for detection of nitrite.The interleaved foliated ZIF-67 nanosheets were synthesized on CC,and then coral-like Au NPs were coated on ZIF-67 modified CC by electrodeposition.The morphology,composition and surface area of Au NPs/ZIF-67/CC were characterized by scanning electron microscopy(SEM),X-ray photoelectron spectroscopy(XPS),X-ray diffraction(XRD)and N_(2) adsorption-desorption test.The prepared electrode combined the high catalytic performance of Au NPs with the morphology of ZIF-67,significantly increasing the surface area and electrocatalytic activity of the electrode.The oxidation potential of NO_(2)^(–)on Au NPs/ZIF-67/CC electrode decreased significantly,and the oxidation current increased significantly,showing excellent response performance.Cyclic voltammetry(CV)was used to detect NO_(2)^(–)with linear ranges of 0.005–5.0 mmol/L and 5.0–24.0 mmol/L,and limit of detection(LOD,3σ/S)of 1.26μmol/L.Chronoamperometry(i-t)was also used to detect NO_(2)^(–),with linear ranges of1–800μmol/L and 800–1800μmol/L,and LOD(3σ/S)of 0.08μmol/L.In addition,Au NPs/ZIF-67/CC prepared here showed good anti-interference,repeatability and stability,and could be used to detect NO_(2)^(–)in real samples.

关 键 词：碳布 金纳米颗粒 沸石咪唑酯框架结构材料 电化学 亚硝酸盐传感器 

分 类 号：O657.1[理学—分析化学] TB332[理学—化学]