石墨烯-ZnO复合物修饰玻碳电极微分脉冲伏安法同时测定邻苯二酚和对苯二酚

Simultaneous determination of catechol and hydroquinone by differential pulse voltammetry with graphene-ZnO composite modified glassy carbon electrode

通过壳聚糖(CHIT)成膜,制备了一种新的石墨烯-ZnO复合物修饰玻碳电极(GR-ZnO/CHIT/GCE)。运用循环伏安法研究了邻苯二酚和对苯二酚在修饰电极上的电化学行为。实验结果表明,在0.1mol/L B-R(pH 4.0)缓冲液中,修饰电极对邻苯二酚和对苯二酚的电化学氧化还原显示出较高的催化特性。在优化条件下,利用微分脉冲伏安法测定,邻苯二酚和对苯二酚的氧化峰电流与浓度在8.0×10-7～5.0×10-5 mol/L范围内呈良好的线性关系,检测限均为2.0×10-7 mol/L(S/N=3)。将该方法用于模拟水样中邻苯二酚和对苯二酚的测定,结果较满意。

A novel graphene-ZnO composite modified glassy carbon electrode （GR-ZnO/CHIT/GCE） was prepared by forming chitosan （CHIT） film. The electrochemical behavior of catechol and hydroquinone on the modified electrode was studied by cyclic voltammetry. Experimental results showed that the modified electrode presented higher catalytic properties on the electrochemical redox of catechol and hydroquinone in the 0.1 mol / L B-R buffer solution（pH 4.0）. Under optimized conditions, the differential pulse voltammetry was used for the determination of catechol and hydroquinone. The oxidation peak current showed a good linear relationship with concentration of catechol and hydroquinone in the range of 8.0 × 10^-7 5.0 × 10^- 5 mol / L. The detection limit of catechol and hydroquinone were 2.0 × 10^-7 mol/L （S/N = 3）. The method was used to the determination of catechol and hydroquinone in simulated water samples with satisfactory results.