电还原氧化石墨烯修饰电极检测苯二酚异构体

Determination of dihydroxybenzene isomers by electro-reduced graphene oxide modified electrode

基于氧化石墨烯修饰电极,通过简单的恒电位还原方式制备电还原氧化石墨烯修饰电极(r GO/GCE),采用循环伏安法(CV)和微分脉冲伏安法(DPV)研究了对苯二酚(HQ)、邻苯二酚(CT)、间苯二酚(RS)3种苯二酚异构体混合物在该电极上的电化学响应,并将检测条件逐步优化。结果表明,r GO/GCE可用于同时检测苯二酚的3种同分异构体,HQ、CT在r GO/GCE上的电位差为141.29 m V,CT、RS间的电位差为323.81 m V,线性范围分别为5.00×10^(-5)~2.00×10^(-3)、5.00×10^(-5)~2.00×10^(-3)、7.00×10^(-5)~3.00×10^(-3)mol/L,检出限分别达到3.57×10^(-7)、3.62×10^(-7)、3.55×10^(-6)mol/L。并将所制备电极应用于模拟水样,获得满意结果。

Electro-reduced graphene oxide modified electrode( rG O/GCE) is prepared by simple constant potentiometric reduction method using graphene oxide modified electrode as template. Cyclic voltammetry( CV) and differential pulse voltammetry( DPV) methods are used to study the electrochemical response of the dihydroxybenzene isomers mixture on the electrode,which including hydroquinone( HQ),catechol( CT) and resorcinol( RS),and the experimental conditions are optimized gradually.It is indicated that rG O/GCE can be used to detect simultaneously the three isomers of dihydroxybenzene.The potential difference in rG O/GCE is 141. 29 mV between HQ and CT,and 323. 81 mV between CT and RS.The linear concentration ranges of HQ,CT and RS are 5. 00 × 10-5-2. 00 × 10-3,5. 00×10-5-2. 00×10-3 and 7. 00×10-5-3. 00× 10-3 mol·L-1 respectively,and their detection limits are 5.00×10-5-2.00×10-3,5.00×10-5-3.55×10-6mol·L-1 separately.The satisfactory determination results are gained when the prepared electrodes are applied to simulated water samples.