中文摘要：

利用多巴胺的聚合及还原特性,制备聚多巴胺包覆还原氧化石墨烯,在氮气保护下煅烧,制得氮原位掺杂石墨烯（C/N-Graphene）。应用扫描电镜（SEM）、透射电镜（TEM）、傅里叶变换红外（FT-IR）光谱表征该复合物的形貌和结构。应用滴涂及Nafion膜固定法制备C/N-Graphene修饰玻碳电极（C/N-Graphene/GCE）。该修饰电极对苯二酚3种异构体的氧化反应表现出优异的电催化性能和选择性,差分脉冲伏安法（DPV）峰电流与对苯二酚（HQ）、邻苯二酚（CC）、间苯二酚（RC）的浓度呈良好的线性关系,其线性范围分别为0.5~1 000μmol/L、0.5~460μmol/L和0.1~580μmol/L,检出限分别为0.251μmol/L、0.144μmol/L和0.072μmol/L。该方法应用于药厂废水和江水检测,3种苯二酚异构体回收率为97.0%~103.0%,相对标准偏差（RSD）小于5%（n=5）,结果表明C/N-Graphene/GCE修饰电极适用于污染水样的快速检测。

英文摘要：

Polydopamine coated graphene oxide was prepared, and calcined under the nitrogen protection to obtain nitrogen doped graphene nanocomposite（C/N-Graphene）. The morphology and structure of C/ N-Graphene were characterized by scanning electron microscopy, transmission electron microscopy, and Fourier transform infrared spectroscopy. C/N-Graphene was modified onto glassy carbon electrode as the working electrode （C/N-Graphene/GCE） to detect dihydroxybenzene isomer. A good linear relationship between differential pulse voltammetry peak current and the concentration of hydroquinone （HQ）, catechol（CC） ,resorcinol（RC） was observed. Dihydroxybenzene isomer could be detected simultaneously with a wide linear range and low detection limits. The concentration of HQ, CC, RC in pharmaceutical wastewater and river water could be determined, the recovery was 97. 0%-103. 0% with the relative standard deviation less than 5%（n= 5）. This indicates C/N-Graphene/GCE electrode could be used for the rapid determination of dihydroxybenzene isomers in waste.