对氯酚在碳纳米管修饰玻碳电极上的电化学行为研究

Study on electrochemical behavior of p-pchlorophenol at a multi-wall carbon nanotubes modified glassy carbon electrode

研究了对氯酚在多壁碳纳米管修饰玻碳电极（MWNTs/GC）上的电化学行为。MWNTs/GC电极对对氯酚具有良好的电催化作用,相比玻碳电极对氯酚的氧化峰电位负移76 mV,峰电流达到玻碳电极上的8倍。通过线性扫描伏安法研究了富集时间、溶液pH和扫描速率对对氯酚氧化的影响。并采用计时电流法研究了氧化峰电流与对氯酚的浓度关系,结果显示峰电流与对氯酚的浓度在2.0×10^-7-2.0×10^-4mol/L范围内呈良好线性关系,检出限为8.8×10-8mol/L（S/N=3）。放置7 d后,对氯酚在碳纳米管上的峰电流仍能达到最初电流的96.2%,表明电极的稳定性较好。

Electrochemical behavior of p-chlorophenol at a MWNTs modified glassy carbon electrode （MWNTs/GC） was studied. The result demonstrates that the MWNTs/GC electrode catalyzes greatly the p-ehlorophenol oxidation, anodic peak potential shifts negatively for 76 mV, oxidation peak current reaches 8 times of that at a glassy carbon electrode. The influences of the accumulation time, the pH value and scan rate on the oxidation of p-chlorophenol have also been studied. The relationship between the current and concentration of p-chlorophenol was studied by chronoamperometry. The peak current is linearly proportional to the concentration of p-chlorophenol in the range from 2.0× 10^-7 to 2.0 ×10^-4 mol/L, and the detection limit is 8.8 ×10^-8 mol/L （S/N = 3）. Having been placed for 7 days in atmosphere, the oxidation peak current of p-ehlorophenol at the MWNTs/GC electrode still retains 96.2% of the original current which indicates the MWNTs/GC electrode possesses good stability.