苯并噻唑和铁氧化物纳米粒子修饰的磁性棒碳糊电极上肼的电催化氧化反应:同时检测肼和苯酚

doi:10.1016/S1872-2067(15)61046-4

摘要/Abstract

摘要：

开发了一种磁性Fe₃O₄纳米粒子和2-(3,4-二羟苯基)苯并噻唑(DPB)修饰的磁性棒碳糊电极(MBCPE)用于电化学检测肼. 首先将DPB自组装在Fe₃O₄纳米粒子上, 然后将此复合物吸附于设计的MBCPE上. MBCPE电极将磁性纳米粒子吸引到电极表面. 所得新型电极具有高的导电性和大的有效比表面积, 因而对肼的电催化氧化反应有非常大的电流响应. 采用伏安法、扫描电镜、电化学阻抗谱、红外光谱和紫外-可见光谱对修饰电极进行了表征. 采用伏安法研究了在磷酸盐缓冲溶液(pH = 7.0)中MBCPE/Fe₃O₄NPs/DPB电极上肼的电化学行为. 作为电化学传感器, MBCPE/Fe₃O₄NPs/DPB电极对肼氧化反应表现出极高的电催化活性. 在DPB存在下, 肼的氧化电势下降, 但其催化电流增加. 电催化电流与肼浓度在0.1-0.4和0.7-12.0 μmol/L二个区间内表现出线性关系, 检测限为18.0 nmol/L. 另外, 研究了MBCPE/Fe₃O₄NPs/DPB电极同时检测肼和苯酚的性能. 伏安实验结果显示, 苯酚的线性区域为100-470 μmol/L, 检测限为24.3 μmol/L. 采用此电极检测了水样品中的肼和苯酚.

关键词: 修饰电极, 电催化氧化, 肼, 苯酚, 磁性棒修饰碳糊电极, 四氧化三铁纳米粒子

Abstract:

A magnetic bar carbon paste electrode (MBCPE) modified with Fe₃O₄ magnetic nanoparticles (Fe₃O₄NPs) and 2-(3,4-dihydroxyphenyl) benzothiazole (DPB) for the electrochemical determination of hydrazine was developed. The DPB was firstly self-assembled on the Fe₃O₄NPs, and the resulting Fe₃O₄NPs/DPB composite was then absorbed on the designed MBCPE. The MBCPE was used to attract the magnetic nanoparticles to the electrode surface. Owing to its high conductivity and large effective surface area, the novel electrode had a very large current response for the electrocatalytic oxidation of hydrazine. The modified electrode was characterized by voltammetry, scanning electron microscopy, electrochemical impedance spectroscopy, infrared spectroscopy, and UV-visible spectroscopy. Voltammetric methods were used to study the electrochemical behaviour of hydrazine on MBCPE/Fe₃O₄NPs/DPB in phosphate buffer solution (pH = 7.0). The MBCPE/ Fe₃O₄NPs/DPB, acting as an electrochemical sensor, exhibited very high electrocatalytic activity for the oxidation of hydrazine. The presence of DPB was found to reduce the oxidation potential of hydrazine and increase the catalytic current. The dependence of the electrocatalytic current on the hydrazine concentration exhibited two linear ranges, 0.1-0.4 μmol/L and 0.7-12.0 μmol/L, with a detection limit of 18.0 nmol/L. Additionally, the simultaneous determination of hydrazine and phenol was investigated using the MBCPE/Fe₃O₄NPs/DPB electrode. Voltammetric experiments showed a linear range of 100-470 μmol/L and a detection limit of 24.3 μmol/L for phenol, and the proposed electrode was applied to the determination of hydrazine and phenol in water samples.

Key words: Modified electrode, Electerocatalytic oxidation, Hydrazine, Phenol, Magnetic bar modified carbon paste electrode, Fe₃O₄ nanoparticle

Ali Benvidi, Shahriar Jahanbani, Bibi-Fatemeh Mirjalili, Reza Zare. 苯并噻唑和铁氧化物纳米粒子修饰的磁性棒碳糊电极上肼的电催化氧化反应:同时检测肼和苯酚[J]. 催化学报, 2016, 37(4): 549-560.

Ali Benvidi, Shahriar Jahanbani, Bibi-Fatemeh Mirjalili, Reza Zare. Electrocatalytic oxidation of hydrazine on magnetic bar carbon paste electrode modified with benzothiazole and iron oxide nanoparticles: Simultaneous determination of hydrazine and phenol[J]. Chinese Journal of Catalysis, 2016, 37(4): 549-560.

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