碳纳米管修饰电极同时测定邻苯二酚和对苯二酚

Simultaneous Determination of Catechol and Hydroquinone at a Carbon Nanotubes Modified Electrode

用十二烷基磺酸钠（SDS）分散碳纳米管（CNTs）,通过层层组装（LBL）聚二甲基二烯丙基氯化铵（PDDA）和CNTs构筑PDDA/CNTs多层膜电极.利用紫外-可见光谱法对PDDA/CNTs多层膜的组装过程进行监测,用循环伏安法（CV）和差分脉冲伏安法（DPV）研究了邻苯二酚和对苯二酚同时存在时PDDA/CNTs多层膜电极上的电化学行为.结果表明,碳纳米管修饰电极对邻苯二酚和对苯二酚有较好的电催化活性和电分离作用,邻苯二酚和对苯二酚无需经过分离即可同时被检出.在修饰电极上的线性范围如下：邻苯二酚为2.0×10-6~1.4×10-4mol/L,线性相关系数R=0.9991;对苯二酚为2.0×10-6~1.4×10-4mol/L,线性相关系数R=0.9987.

In this paper,carbon nanotubes（CNTs） were dispersed by the use of sodium dodecyl sulfate（SDS）.Through layer-by-layer assembly of poly dimethyldiallylammonium chloride（PDDA） and CNTs,PDDA/CNTs multilayer films modified electrode was fabricated on the gold electrodes.PDDA/CNTs multilayer films were characterized by UV-Vis spectroscopy.The electrochemical behavior of the PDDA/CNTs multilayer modified electrode was studied by the cyclic voltammetry（CV） and differential pulse voltammetric（DPV） in the coexistence of the catechol and hydroquinone.The PDDA/CNTs multilayer modified electrode shows the strong electrocatalytic behaviour and electro-separation.The isomers of catechol and hydroquinone were detected at the same time without the separation.The linear range for the determination of catechol and hydroquinone： catechol is 2.0×10-6—1.4 ×10-4 mol/L with the correction coefficient of 0.9991;hydroquinone is 2.0×10-6—1.4×10-4 mol/L with the correction coefficient of 0.9987.