论文部分内容阅读
开发了一种磁性Fe_3O_4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Fe_3O_4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/Fe_3O_4NPs/DPB电极上肼的电化学行为.作为电化学传感器,MBCPE/Fe_3O_4NPs/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0.7–12.0μmol/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/Fe_3O_4NPs/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100–470μmol/L,检测限为24.3μmol/L.采用此电极检测了水样品中的肼和苯酚.
A magnetic Fe3O4 nanoparticle and 2- (3,4-dihydroxyphenyl) benzothiazole (DPB) modified magnetic rod carbon paste electrode (MBCPE) were developed for the electrochemical detection of hydrazine.First, DPB was self-assembled in Fe_3O_4 nanoparticles, and then the complex was adsorbed on the designed MBCPE .MBCPE electrode to attract magnetic nanoparticles to the electrode surface. The resulting new electrode has a high conductivity and large effective surface area, and thus the electrocatalytic oxidation of hydrazine The results showed that the modified electrode was characterized by voltammetry, scanning electron microscopy, electrochemical impedance spectroscopy, infrared spectroscopy and UV-Vis spectroscopy. The electrochemical behavior of hydrazine on the MBCPE / Fe 3 O 4 NPs / DPB electrode was investigated.As an electrochemical sensor, the MBCPE / Fe 3 O 4 NPs / DPB electrode exhibited high electrocatalytic activity for the hydrazine oxidation.The oxidation potential of hydrazine decreased in the presence of DPB, But its catalytic current increased.The electrocatalytic current and hydrazine concentration showed a linear relationship in the two intervals of 0.1-0.4 and 0.7-12.0μmol / L with a detection limit of 18.0 nmol / L. In addition, the MBCPE / Fe 3 O 4 NPs / DPB electrode Simultaneous detection of hydrazine and The results of voltammetry showed that the linear range of phenol was 100-470μmol / L and the detection limit was 24.3μmol / L. Hydrazine and phenol were detected in this water sample using this electrode.