基于Cu-BTC的2,4-二氯苯酚电化学传感器研究

Research on electrochemical sensor based on Cu-BTC for 2,4-dichlorophenol detection

利用水热合成法制备了金属有机框架(MOFs)材料-铜-1,3,5-苯三甲酸(Cu-BTC)。研制了一种基于Cu-BTC复合纳米导电碳粉(VXC-72)修饰玻碳电极(GCE)的电化学传感器,用于2,4-二氯苯酚(2,4-DCP)的敏感检测。利用循环伏安(CV)法和差分脉冲伏安(DPV)法研究传感电极Cu-BTC@VXC-72/GCE的电化学性能,确定了Cu-BTC︰VXC-72为1︰1.5(质量比),磷酸盐缓冲液(PBS)pH值为7,以及扫描速度50 mV/s的最佳电化学响应条件。DPV结果表明:在最佳响应条件下,5×10^(-7)~8×10^(-6)mol/L的2,4-DCP浓度范围内,氧化峰电流与2,4-DCP浓度呈现良好的线性关系,检测限可达7.895×10^(-8)mol/L;同时,Cu-BTC@VXC-72/GCE传感电极在2,4-DCP的敏感检测中表现出强的抗干扰能力和好的稳定性,20天连续测定后的氧化峰电流衰减不足20%。

Metal-organic frameworks(MOFs)material,copper-1,3,5-benzenetricarboxylic acid(Cu-BTC)is prepared by hydrothermal synthesis method.An electrochemical sensor based on glass carbon electrode modified with Cu-BTC mixed with nano-conductive carbon powder(VXC-72)is researched and fabricated for 2,4-dichlorophenol(2,4-DCP)sensing detection.Cyclic voltammetry(CV)and differential pulse voltammetry(DPV)are used to research on electrochemical properties of Cu-BTC@VXC-72/GCE sensing electrode.Optimal electrochemical response conditions of Cu-BTC︰VXC-72=1︰1.5(mass ratio),phosphate buffer solution(PBS)pH=7 and scanning speed of 50 mV/s are determined.The DPV results show that under the optimal response conditions,relationship between the oxidation peak current and the 2,4-DCP concentration exhibits good linear in the range of 5×10^(-7)~8×10^(-6)mol/L and detection limitation can reach 7.895×10^(-8)mol/L.The Cu-BTC@VXC-72/GCE sensing electrode exhibits strong anti-interference ability and good stability in the 2,4-DCP sensing detection,and the oxidation peak current decays less than 20%after 20 days of continuous measurement.