Key Laboratory Bioelectrochemistry & Enviromental Analysis of Gansu Province, College of Chemistry & Chemical Engineering, Northwest Normal University, Lanzhou, PR China.
Colloids Surf B Biointerfaces. 2011 Nov 1;88(1):292-6. doi: 10.1016/j.colsurfb.2011.07.004. Epub 2011 Jul 12.
MWNTs-IL-Gel/GCE, a glassy carbon electrode modified with multiwalled carbon nanotubes (MWNTs) and ionic liquids (IL), was developed to serve as a sensor for simultaneous determination of Hydroquinone (HQ) and catechol (CC) in this paper. The modified GCE showed two well-defined redox waves for HQ and CC in both CV and DPV with a peak potential separation of ca. 0.1 V, which was large enough for simultaneous detection. The results revealed that the oxidation of HQ and CC with the enhancement of the redox peak current and the decrease of the peak-to-peak separation exhibit excellent electrocatalytic behaviors. A high sensitivity of 1.8×10(-7)M with detection limits of 6.7×10(-8)M and 6.0×10(-8)M (S/N=3) for HQ and CC were obtained. Moreover, the constants of apparent electron transfer rate of HQ and CC at MWNTs-IL-Gel/GCE were calculated as 7.402 s(-1) and 8.179 s(-1), respectively, and the adsorption quantity of HQ and CC was 1.408×10(-6) mol cm(-2) with chronocoulometry. The developed sensor can be applied to determinate directly of HQ and CC in aqueous solution.
MWNTs-IL-Gel/GCE，一种修饰玻碳电极的多壁碳纳米管 (MWNTs) 和离子液体 (IL)，被开发出来作为传感器，用于同时测定水样中的对苯二酚 (HQ) 和邻苯二酚 (CC)。修饰后的 GCE 在 CV 和 DPV 中均显示出 HQ 和 CC 的两个定义明确的氧化还原波，峰电位分离约为 0.1 V，足以进行同时检测。结果表明，HQ 和 CC 的氧化伴随着氧化峰电流的增强和峰-峰分离的减小，表现出优异的电催化行为。HQ 和 CC 的灵敏度分别高达 1.8×10(-7)M 和 6.7×10(-8)M（S/N=3），检测限分别为 6.7×10(-8)M 和 6.0×10(-8)M。此外，HQ 和 CC 在 MWNTs-IL-Gel/GCE 上的表观电子转移速率常数分别计算为 7.402 s(-1)和 8.179 s(-1)，通过计时库仑法计算出 HQ 和 CC 的吸附量分别为 1.408×10(-6)mol cm(-2)。所开发的传感器可直接用于测定水样中的 HQ 和 CC。
Colloids Surf B Biointerfaces. 2011-7-12
Colloids Surf B Biointerfaces. 2009-11-1
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