一步电沉积纳米铜/石墨烯/壳聚糖复合膜修饰玻碳电极测定邻苯二酚

用一步电沉积法制备了纳米铜/石墨烯/壳聚糖复合膜修饰玻碳电极。用循环伏安法(CV)和差分脉冲伏安法(DPV)对邻苯二酚在该修饰电极的电化学行为进行了研究。实验结果表明,在pH值为7.0的磷酸盐缓冲液(PBS)中,该修饰电极对邻苯二酚具有良好的电催化作用,其电化学信号与邻苯二酚的浓度在1.0×10-6～2.0×10-4mol/L范围内呈良好的线性关系,线性相关系数为0.991。检出限为1×10-7mol/L。结果表明,纳米铜/石墨烯/壳聚糖复合膜修饰电极显著提高了邻苯二酚的电化学响应信号,并表现出良好的选择性和重现性。该方法成功用于水样中邻苯二酚含量的测定。

Fabrication of nano-copper/graphene/chitosan composite film modified glassy carbon electrode by one-step electrodeposition and its sensitive detection of catechol

A modified electrode is fabricated by one-step electrodeposition of nano-copper/graphene/chitosan composite film on glass carbon electrode surface.The electrochemical behavior of catechol(CT)at the modified electrode was investigated by cyclic voltametry(CV)and different pulse voltametry(DPV).In pH 7.0 phosphate buffer solution(PBS),the composite film showed excellent electrocatalytic activity for the redox of CT.The concentration of CT showed good linear relationships with the oxidation peak current of CT in the range of 1.0×10-6-2.0×10-4 mol/L,with the limits of detection of 1×10-7mol/L(S/N=3).The corelation coefficient was 0.991.The results showed that the composite film significantly improved the electrochemical respond of CT at the modified electrode.The proposed method exhibited good selectivity and reproducibility.It was successfully applied to determine CT in water samples.