间苯二酚在TiO_2-石墨烯修饰玻碳电极上的电化学行为及测定

Electrochemical behavior of resorcinol and its determination at TiO_2-graphene modified glassy carbon electrode

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%。

An electrochemical sensor is fabricated based on TiO2-graphene nanocomposite film on modified glass carbon elec- trode. The electrochemical behavior of resorcinol（RS） at the modified electrode was investigated by cyclic voltametry（CV） and dif- ferent pulse voltametry（DPV）. In pH 6. 0 phosphate buffer solution （PBS）, the modified electrode showed excellent electrocatalyticactivity 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×l0^-4mol/L mol/L,with the limits of detection of 2×l0^-7mol/L（S/N=3）. The method wasapplied to determine RS in simulated water samples with recoveries of 96. 5-104. 2%.