邻苯二酚在金纳米粒子-碳纳米管复合修饰电极上的电化学行为

Electrochemical Behavior of Catechol at GCE Modified with Gold Nano-particles and Carbon Nanotubes

用循环伏安法研究了在pH7.0的磷酸盐支持电解质中,在-1.0～1.0 V(vs.SCE)电位范围内,邻苯二酚在金纳米粒子-碳纳米管复合修饰电极上的电化学行为,发现金纳米粒子-碳纳米管复合膜对邻苯二酚的电化学反应具有非常明显的电催化作用,催化效果强于单独的金纳米粒子或碳纳米管修饰电极。邻苯二酚在该修饰电极上的电化学反应受到表面吸附过程控制。可利用该修饰电极对对苯二酚、邻苯二酚和间苯二酚进行同时测定。邻苯二酚在4.0×10-5～1.0×10-3mol.L-1范围内呈线性,检出限(3S/N)达到1.0×10-5mol.L-1。

Electrochemical behavior of catechol was studied at glassy carbon electrode modified compositely with gold nano particles and carbon nano tubes（designated as AuNP′s-CNT′s/GCE） by cyclic voltammetry in a phosphate buffer supporting electrolyte of pH 7.0 in the potential range of-1.0 to 1.0 V（vs.SCE）.As shown by the experimental results,siginficant electro-catalysis was observed at this modified electrode,and the catalytic effect was stronger than those at the electrode modified either with AuNP′s or CNT′s singly.It was shown also that the electrode reaction of catechol at the AuPN′s-CNT′s/GCE was controlled by the process of surface adsorption.Linear relationship between values of oxidation peak current and concentration of catechol was obtained in the range of 4.0×10-5-1.0×10-3mol·L-1.Detection limit（3S/N） of 1.0×10-5mol·L-1 was found under optimum conditions.Three isomers of dihydroxybenzene were determined simultaneously by this method.