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- 2018
MnO2纳米棒-还原石墨烯复合修饰玻碳电极用于苋菜红的检测
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Abstract:
利用电化学还原法制备MnO2纳米棒-还原石墨烯复合修饰电极（MnO2 NRs-ErGO/GCE）用于苋菜红的检测。采用SEM和XRD分别对修饰电极材料进行微观形貌和成分结构表征。通过循环伏安法考察了苋菜红在裸电极、ErGO/GCE和MnO2 NRs-ErGO/GCE上的电化学行为，并对测定条件如pH值、富集电位、富集时间进行了优化。结果表明，MnO2 NRs-ErGO增大了GCE电化学活性面积，提高了苋菜红的电化学氧化响应。在最优的检测条件下，MnO2 NRs-ErGO/GCE线性扫描伏安法检测苋菜红线性范围为2.0×10-8~1.0×10-5 mol/L和1.0×10-5~4.0×10-4 mol/L，检测限为1.0×10-8 mol/L。MnO2 NRs-ErGO/GCE用于真实饮料样品检测，获得满意结果。 MnO2 nanorods-reduced graphene composite modified glassy carbon electrode (MnO2 NRs-ErGO/GCE) was prepared for the detection of amaranth using electrochemical reduction method. The surface morphology and crystal structure of the modified materials were characterized by SEM and XRD. The electrochemical behavior of amaranth on the bare electrode, ErGO/GCE and MnO2 NRs-ErGO/GCE modified electrodes were investigated by cyclic voltammetry, respectively. The determination conditions (including pH value, accumulation potential, and accumulation time) were optimized systematically. The results show that MnO2 NRs-ErGO increases the electrochemical active area of GCE and improves the electrochemical oxidation reaction of amaranth significantly. Under the optimum detection conditions, the peak current is found to be linear with amaranth concentrations in the range from 2.0×10-8-1.0×10-5 mol/L and 1.0×10-5-4.0×10-4 mol/L with a low detection limit of 1.0×10-8 mol/L. The satisfactory results are obtained in the analysis of actual beverage samples by using the proposed modified electrode. 国家自然科学基金（61703152）；湖南省自然科学基金（2016JJ4010；2018JJ3134）；衡阳师范学院省级平台开放基金（GD16K02）；湖南工业大学博士学科建设项目
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