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文章将纳米金与钴氢氧化物膜的催化作用有效结合,制备了GNPs/CoOOH复合修饰电极,该修饰电极在碱性条件下对邻苯二酚和对苯二酚具有较强的电催化活性。考察了支持电解质酸度及纳米金沉积时间对邻苯二酚和对苯二酚电化学响应的影响,选取0.1 mol/L PBS(pH 10.0)作为支持电解质,纳米金的最佳沉积时间为4 min。在优化的实验条件下,利用差示脉冲伏安法(DPV)对邻苯二酚和对苯二酚进行选择性检测:当两者浓度同时改变时,对苯二酚和邻苯二酚的氧化峰电流与其浓度分别在7~100μmol/L和6~100μmol/L范围内呈良好的线性关系,对应的检出限分别为0.9、0.8μmol/L(S/N=3)。该复合修饰电极具有较好的重现性、稳定性及较强的抗干扰能力。
In this paper, GNPs / CoOOH composite modified electrode was prepared by the effective combination of nano-gold and cobalt hydroxide membrane. The modified electrode has strong electrocatalytic activity on catechol and hydroquinone under alkaline condition . The effects of electrolyte pH and gold deposition time on the electrochemical response of catechol and hydroquinone were investigated. The optimum deposition time was 4 min for 0.1 mol / L PBS (pH 10.0) as the supporting electrolyte. . Under optimized experimental conditions, selective detection of catechol and hydroquinone by differential pulse voltammetry (DPV) was performed: when the concentrations of both were changed simultaneously, hydroquinone and catechol The peak current of oxidation peaked at a concentration of 7 ~ 100μmol / L and 6 ~ 100μmol / L respectively. The corresponding detection limits were 0.9,0.8μmol / L (S / N = 3). The composite modified electrode has good reproducibility, stability and strong anti-interference ability.