采用循环伏安(CV)、方波脉冲伏安(SWV)和计时电流(CA)技术研究了含氧酸根离子BrO-3,ClO-3,NO-2和4-硝基苯酚(4-NP)在WO3/PANI修饰电极上的电催化还原.实验结果表明,WO3/PANI对BrO-3,ClO-3,NO-2以及4-NP电化学还原都具有良好的催化活性.恒电位时,WO3/PANI对相应底物有快速的电流响应,在40μmol/L~1.2 mmol/L(BrO-3),0.12~20 mmol/L(ClO-3),40μmol/L~2.50 mmol/L(NO-2),50~400μmol/L(4-NP)浓度范围内,响应电流与底物浓度呈线性关系,检测灵敏度及检测限(S/N=3)分别为0.202μA/(μmol/L),4.8μmol/L(BrO-3);0.035μA/(μmol/L),23μmol/L(ClO-3);0.120μA/(μmol/L),5.9μmol/L(NO-2);0.443μA/(μmol/L),8.8μmol/L(4-NP).
Cyclic voltammetry(CV),chronoamperometry(CA) and square wave voltammetry(SWV) were used to investigate electrocatalytic reductions of BrO-3,ClO-3,NO-2 and 4-nitrophenol on carbon cloth modified by composite film of tungsten oxide(WO3) and polyaniline(PANI).Results of amperometric ex-periments on WO3/PANI modified electrode revealed good linear relationship between response currents of the electrode and concentration of BrO-3,ClO-3,NO-2 and 4-nitrophenol in the range of 40 μmol/L~1.2 mmol/L,0.12~20 mmol/L,40 μmol/L~2.50 mmol/L and 50~400 μmol/L,respectively.The sensitivity and the detection limit(S/N=3) for these species are 0.202 μA/(μmol/L),4.8 μmol/L(BrO-3);0.035 μA/(μmol/L),23 μmol/L(ClO-3);0.120 μA/(μmol/L),5.9 μmol/L(NO-2) and 0.443 μA/(μmol/L),8.8 μmol/L(4-nitrophenol).