普鲁士蓝-多壁碳纳米管复合材料修饰电极测定过氧化氢

Prussian Blue/Multi-walled Carbon Nanotubes Composite Films Modified Glassy Carbon Electrode for the Determination of Hydrogen Peroxide

利用电化学方法在多壁碳纳米管 （MWCNT）修饰的玻碳电极表面聚合一层普鲁士蓝（PB）（PB/MWCNT/GCE）,制备了一种新型的过氧化氢（H2O2）传感器.研究了该传感器对H2O2的电催化作用.讨论了支持电解质种类、酸度、修饰层厚度、电位和扫速等对H2O2响应的影响.研究表明,该传感器在以1.0 mol/L KCl为支持电解质的磷酸盐溶液（pH=2.0）中,对H2O2具有明显的催化效应,测定的线性范围变宽,在2.9×10 -6～8.8×10 -2mol/L范围内还原峰电流与H2O2的浓度呈良好的线性关系,相关系数为0.9949;检出限为1.4×10 -6mol/L.该电极用于医用消毒水中H2O2的测定,结果令人满意.

A novel method for the fabrication of a hydrogen peroxide sensor was developed by electrodepositing Prussian blue on the multi-walled carbon nanotubes modified glassy carbon electrode （PB/MWCNT/GC）. The factors such as the type and acidity of electrolytes, the thickness of PB and MWCNT-modified layer, the scan rates and the applied potential that influencing the voltammetric behavior of PB in the presence of hydrogen peroxide were studied in detail. In 0. 1 moL/L phosphate solution （ pH 2.0） containing 1.0 moL/L potassium chloride, the resulted sensor exhibited a wider linear range of 2.9 × 10 ^-6 - 8.8 × 10^ -2 moL/L with a correlation coefficient of 0. 9949. The detection limit of the sensor was 1.4 × 10^ -6 moL/L. Such sensor could be used for the determination of hydrogen peroxide in disinfector with satisfactory results.