金属磷化物/硅烷偶联剂包覆石墨电极的制备及苯二酚异构体的检测应用  

Preparation of graphite electrode coated with metal phosphide/silane coupling ag ent and detection of hydroquinone isomers

作　　者：吴锐[1] 陈纪文[1] 马少宁[1] 段成茜 Wu Rui;Chen Ji-wen;Ma Shao-ning;Duan Cheng-qian(Yinchuan Energy Institute,Ningxia Yinchuan 750100,China;Basic Medical College,Ningxia Medical University,Ningxia Yinchuan 750004,China)

机构地区：[1]银川能源学院石油化工系,宁夏银川750100 [2]宁夏医科大学基础医学院,宁夏银川750004

出　　处：《炭素技术》2023年第3期43-47,58,共6页Carbon Techniques

基　　金：宁夏高等学校科学研究项目(NGY2018-252)。

摘　　要：将金属磷化物均匀地分散在硅烷偶联剂中,包覆石墨颗粒后并制成复合修饰炭糊电极,并采用X射线能谱分析、扫描电镜、电化学阻抗对其进行表征。结果标明,包覆石墨颗粒形成了紧密连接的椭球状,相比裸炭糊电极(CPE)Ret值减小了32倍。采用计时库仑法得到有效电极面积为0.058 cm^(2),相比CPE增大0.5倍。该复合修饰电极可用于对苯二酚3种异构体电化学行为研究。与CPE相比,电催化氧化明显增强。采用计时电流法得到3种苯二酚异构体在不同电极上的反应速率常数,结果进一步证明复合修饰电极电催化效果最好;采用方波伏安法测得到3种异构体响应电流与浓度在一定范围内呈线性关系,同时应用于河水的检测,RSD(相对偏差)在2.6%~4.2%之间,回收率达97.9%~103.6%。In this paper,the transition metal phosphates are uniformly dispersed in silane coupling agent,which was used to coat graphite to make modified carbon paste electrode.The composite was characterized by energy dispersive spectroscopy,scanning electron microscopy,electrochemical inpedance spectrum.As a result,closely connected ellipsoidal particles are formed.The Re value of the ellipsoidal particles is 32 times smaller than that of the carbon paste electrode(CPE).The effective electrode area obtained by chronocoulometry is 0.058 cm^(2),which is 0.5 times larger than that of CPE.The composite modified electrode can be simultaneously used to study the electrochemical behavior of three hydroquinone isomers.Compared with CPE,the electrocatalytic oxidation is significantly enhanced.The reaction rate constants of three hydroquinone isomers at different electrodes were obtained by chronoamperometry.The results indicated that the electrocatalysis effect of the composite modified electrode is the best.The response current of three isomers measured by square wave impulse voltammetry is linear with the concentration in a certain range.It is applied to the detection of river water,with their relative standard deviations of 2.6%~4.2% and recoveries of 97.9%~103.6%.

关 键 词：苯二酚异构体 硅烷偶联剂 修饰炭糊电极 

分 类 号：TM911.15[电气工程—电力电子与电力传动] O657.1[理学—分析化学]