对苯二酚在掺Cu(Ⅱ)类普鲁士蓝膜修饰电极上的电化学行为研究

Study of Hydroquinone's Electrochemical Behaviors on the Electrode Modified with Analogous Prussian Blue Film Doped with Copper(Ⅱ) Ion

采用循环伏安法在普鲁士蓝膜中掺杂cu2＋，制得掺cu（Ⅱ）类普鲁士蓝膜（cu—PB膜）。利用循环伏安法、库仑分析法和电化学阻抗法对cu—PB膜进行电化学表征，结果显示cu。’进入普鲁士蓝的内部结构，取代了其中的高自旋铁。该cu（Ⅱ）类普鲁士蓝膜对对苯二酚具有明显的电催化作用，电极反应过程是扩散控制的准可逆过程，在5．0×10-5～1．0×10mol·L-1范围内，还原峰电流与对苯二酚浓度呈良好的线性关系，检出限为1．0×10-6mol·L-1。计算了对苯二酚在cu—PB膜修饰电极上电极过程的动力学参数。

Using cyclic voltammetric method, a analogous prussian blue modified film doped with Cu2＋ ion（Cu -PB） was prepared by mixing Cu2＋ ion in prussian blue modified film（PB）. The Cu - PB modified film was studied by cyclic voltammetry（ CV）, chronocoulometry and electrochemical im- pendence method. It was shown that Cu2＋ has entered into PB structure and replaced high-spin Fe of PB. The Cu - PB modified film showed an obvious electro-catalytic action for hydroquinone, and the electrochemical behaviors of hydroquinone was a quasi-reversible redox process. A linear relationship between reductive peak current and concentration of hydroquinone were found in the range of 5. 0 × 10 -5 - 1.0 × 10-3 mol. L-1with a detection limit of 1.0 × 10-6 mol . L-1. The kinetics＇s parameter of hydroquinone on the Cu -PB film modified electrode was also discussed.