中空ZnSn(OH)_6/Ti_3C_2 MXene纳米复合材料电化学传感器的构建及检测呋喃西林

通过一步水热法制备中空ZnSn(OH)_6微球,将其与二维Ti_3C_2 MXene纳米片复合后获得ZnSn(OH)_6/Ti_3C_2 MXene纳米复合材料,并由此构建了新型的电化学传感器.采用循环伏安法研究了呋喃西林在该传感器上的不可逆氧化峰.其伏安过程为受吸附控制的过程,氧化反应电荷转移数为2.利用微分脉冲伏安法对呋喃西林进行定量分析,结果表明,由于ZnSn(OH)_6微球和二维Ti_3C_2 MXene的协同作用,该传感器对呋喃西林的电化学氧化具有显著催化作用.呋喃西林的浓度在0.5～70μmol/L范围内与其氧化峰电流有良好的线性关系,检出限为0.16!μmol/L(R_(SN)=3).该传感器对呋喃西林的测定具有良好的重现性,相对标准偏差(RSD)(n=10)仅3.4%.将该传感平台成功用于动物源食品的分析,回收率在92.0%"107%之间.

Electrochemical Determination of Nitrofurazone by Electrochemical Sensor Base on Hollow ZnSn(OH)_6/Ti_3C_2 MXene Nanocomposite

The ZnSn(OH)_6 microspheres were prepared by one-step hydrothermal method,which were compounded with two-dimensional Ti_3C_2 MXene nanosheets to obtain ZnSn(OH)_6/Ti_3C_2 MXene nanocomposite,and a novel electrochemical sensor was fabricated based on this material.The irreversible oxidation peak of nitrofurazone was firstly studied on this sensor by using cyclic voltammetry.The voltammetric process of nitrofurazone was adsorption-controlled and the electron transfer number of this oxidation reaction was 2.The differential pulse voltammetry was used for the quantitative analysis of nitrofurazone,and the results showed that this sensor had remarkable catalytic effect for the electrochemical oxidation of nitrofurazone owing to the synergistic effect of ZnSn(OH)_6 microspheres and two-dimensional Ti_3C_2 MXene.The concentration of nitrofurazone had good linear relationship with its oxidation peak current in the range of 0.5～70 μmol/L.The detection limit was 0.16 μmol/L(R_(SN)=3).The sensor displayed excellent repeatability for the detection of nitrofurazone,exhibiting a relative standard derivation(RSD)(n=10)of 3.4%.This sensing platform was applied to the analysis of animal-derived foods with the recovery ranging between 92.0% and 107%.