间苯二酚在TiO2-石墨烯修饰玻碳电极上的电化学行为及测定

制备了TiO2-石墨烯修饰玻碳电极。用循环伏安法(CV)和差分脉冲伏安法(DPV)对间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6.0的磷酸盐缓冲液(PBS)中,该修饰电极对间苯二酚具有良好的电催化作用。对TiO2-石墨烯用量、支持电解质、pH和扫描速度等实验条件进行了优化。在优化条件下,利用DPV测定,间苯二酚的氧化峰电流与其浓度在1.0×10-6～1.0×10-4mol/L范围内呈良好的线性关系,线性相关系数为0.995。检出限为2×10-7mol/L。将该方法应用于模拟水样中间苯二酚的测定,回收率为96.5～104.2%。

Electrochemical behavior of resorcinol and its determination at TiO2-graphene modified glassy carbon electrode

An electrochemical sensor is fabricated based on TiO2-graphene nanocomposite film on modified glass carbon electrode.The electrochemical behavior of resorcinol(RS)at the modified electrode was investigated by cyclic voltametry(CV)and different pulse voltametry(DPV).In pH 6.0 phosphate buffer solution(PBS),the modified electrode showed excellent electrocatalytic activity for the redox of RS.The experimental conditions including amount of TiO2-graphene,supported electrolyte,pH and scan rate were optimized.Under the optimization condition,the concentration of RS showed good linear relationships with the oxidation peak current in the range of 1.0×10-6-1.0×10-4 mol/L mol/L,with the limits of detection of 2×10-7 mol/L(S/N=3).The method was applied to determine RS in simulated water samples with recoveries of 96.5-104.2%.