纳米NiO/石墨烯修饰电极电化学同时检测对苯二酚和邻苯二酚

Nano-NiO/graphene modified electrode for simultaneously electrochemical detection of hydroquinone and catechol

采用电化学一步共还原法制备了纳米氧化镍/石墨烯复合材料修饰电极,用于水中对苯二酚(HQ)和邻苯二酚(CC)的同时检测。循环伏安法测试了不同修饰电极的电催化性能,发现纳米氧化镍-石墨烯复合材料(NiO/RGO)修饰电极的电催化性能更优异,峰电位差变小,氧化还原峰电流提高。在优化条件下,采用差分脉冲法检测对苯二酚和邻苯二酚的氧化峰电流,发现浓度在5.0×10^(-6)~8.0×10^(-4)mol/L的范围内呈现较好的线性关系,其检出限分别为1.0×10^(-7)mol/L和5.0×10^(-7) mol/L。该修饰电极具有较好的稳定性和重现性,有望用于环境污染中实际水样的测定。

A nickel oxide nanoparticles and graphene composite materials were modified on the electrode by using one step electrochemical co-reduction method, which was used to simultaneously detect hydroquinone（HQ） and cat- echol（CC） in water sample. The electrocatalytic properties of different modified electrodes were studied by cyclic vohammetry. The results showed that nanoeomposite modified electrode had more excellent electrocatalytie activity, which could make the peak potential difference become smaller and effectively improve the redox peak current . In the optimal conditions, the oxidation peak currents of HQ and CC were detected by differential pulse vohammetry method. The results showed that good linear relationships were obtained between 5.0×10^-6- 8.0×10^-4 mol/L of HQ and CC, and the detection limits were 1.0×l0-7 tool / L and 5.0×10-7 mol / L, respectively. The stability and repro- ducibility of the modified electrode were good. It is expected to be used for the determination of HQ nd CC in envi- ronmental water samples.