多壁碳纳米管修饰电极对对苯二酚的电催化作用

Electrocatalytic Activity of Multi-Walled Carbon Nanotubes Modified Electrode for p-Benzenediol

研究了多壁纳米碳管修饰电极的制备及其对对苯二酚的电催化作用。讨论了支持电解质种类、酸度、修饰层厚度和扫速等因素对对苯二酚伏安响应的影响 ,获得了较为优化的实验条件。在 0 .1mol/L磷酸盐 (pH 6 .0 )缓冲溶液中 ,采用示差脉冲伏安法测定对苯二酚 ,其浓度在 5 .0× 1 0 -6～ 1 .1× 1 0 -3 mol/L范围内与其氧化峰电流呈良好的线性关系 ,检出限达 2 .7× 1 0 -6mol/L。共存的多种金属离子、抗坏血酸及等量的苯酚、邻苯二酚等不干扰测定。该电极用于模拟废水样中对苯二酚的测定 。

The multi-walled carbon nanotubes (MWNT) modified electrode has been fabricated and its electrocatalytic activity for the oxidation of p-benzenediol was investigated. The effect of the type and acidity of electrolytes, the thickness of MWNT-modified layer, scan rates on the voltammetric behavior of p-benzenediol were also studied to acquire optimum conditions for detecting the p-benzenediol. In 0.1 mol/L phosphate buffer (pH 6.0), when differential pulse voltammetric method was used, there was an excellent linearity between oxidation current and concentration of p-benzenediol in the range of 5.0x10(-6)similar to1.1x10(-3) mol/L with a detection limit of 2.7x10(-6) mol/L. A lot of metal ions, ascorbic acid, and equimultiple phenol etc. did not interfere with the determination. The results revealed that the modified electrode could be used to the determination of p-benzenediol in imitative Waste water samples with good results.