基于Au/rGO/FeOOH的新型电化学传感器一步检测亚硝酸盐  

A Novel Electrochemical Sensor Based on Au/rGO/FeOOH for One-Step Detection of Nitrite

作　　者：罗大娟 刘冰倩 覃蒙颜 高荣 苏丽霞 苏永欢 Da-Juan Luo;Bing-Qian Liu;Meng-Yan Qin;Rong Gao;Li-Xia Su;Yong-Huan Su(Guizhou Engineering Laboratory for Synthetic Drugs(Ministry of Education of Guizhou Province),College of Pharmacy,Guizhou university,Guiyang 550025,Guizhou,China)

机构地区：[1]贵州大学药学院,贵州省合成药物工程实验室,贵州贵阳550025

出　　处：《电化学》2022年第8期49-57,共9页Journal of Electrochemistry

基　　金：国家自然科学基金项目(No.21864007,No.21605029);贵州省自然科学基金项目(黔科合基础[2020]1Y042,[2017]5788黔科合人才平台,[2018]5781黔科合人才平台)资助。

摘　　要：亚硝酸盐是一种广泛存在的原料,长期食用会对人体健康不利甚至致癌。因此,简单、灵敏的亚硝酸盐检测方法的开发具有非常重要的意义。本文合成了金/还原氧化石墨烯/羟基氧化铁(Au/rGO/FeOOH)复合材料,并通过SEM、XRD和EDX等测试进行了材料表征。将合成的复合材料滴涂在氧化氟锡(FTO)电极表面,利用它们的协同催化氧化性能,成功构建了一步检测亚硝酸盐(NO_(2)^(-))的新型电化学传感器。在最佳优化实验条件下,通过差分脉冲伏安法实现NO_(2)^(-)的定量检测,其线性范围为0.001~5mmol·L^(-1),检出限为0.8μmol·L^(-1)(S/N=3),且响应时间小于2s。同时,所制备的传感器表现出良好的选择性和重现性,也能用于实际样品的测定。Nitrite,a widespread raw material,is harmful to human health for long-term consumption.At present,the detection methods of nitrite mainly include chemical analysis,fluorescence,ultraviolet spectrophotometry and chromatography.These methods have ideal sensitivity and selectivity,but also have some characteristics:cumbersome operation,expensive equipment and professional personnel.Therefore,the development of a simple and sensitive nitrite assay is of great significance.In this paper,the Au/r GO/Fe OOH composite materials,which revealed good synergistic catalytic performance among the three elements in the composite,were prepared by simple hydrothermal method and reduction method for the first time with large specific surface area and good electrical conductivity.A one-step electrochemical sensor was constructed by using a traditional three-electrode system for detecting NO_(2)^(-).Of course,the Au/r GO/Fe OOH composite modified FTO was regarded as the working electrode.When the target NO_(2)^(-) existed,the current increased because the material on the electrode could electro-catalyze NO_(2)^(-) to NO_(3)^(-).When the NO_(2)^(-) was oxidized,the electron was transferred from NO_(2)^(-) to the Au/r GO/Fe OOH composite.And the r GO with a large specific surface area and good conductivity in the composite would rapidly transfer electrons to the FTO electrode,thus,enhancing the current signal.Quantitative analysis of NO_(2)^(-) could be obtained according to the current intensity which is positively correlated with the concentration of the target.Under the optimal experimental conditions,nitrite was quantitatively detected by differential pulse voltammetry with a linear range of 0.001~5 mmol·L^(-1) and a detection limit of 0.8μmol·L^(-1)(S/N=3),and the response time was less than 2 s.Moreover,the sensor exhibited good selectivity and reproducibility,and could be applied to actual samples.The excellent sensitivity for rapid detection of NO_(2)^(-) may be derived from two aspects:1.the unique structure of r GO Fe OOH

关 键 词：亚硝酸盐 Au/rGO/FeOOH 电化学传感器 一步检测 

分 类 号：O657.1[理学—分析化学] TP212[理学—化学]