以天然鳞片石墨为原料,采用改进的Hummers法制备了氧化石墨(GO),以GO和硫氰酸铵为前驱体,采用一步水热法制备了硫氮共掺杂石墨烯(SNG)。X射线衍射、扫描电子显微镜和拉曼光谱分析结果显示,硫和氮成功掺入石墨烯晶格中,SNG表面褶皱明显且形成了三维孔道结构。通过交流阻抗、循环伏安法和差分脉冲伏安法考察了对苯二酚(HQ)、邻苯二酚(CC)和间苯二酚(RC)在修饰玻碳电极(SNG-180/GCE)上的电化学行为。结果表明:硫氮共掺杂能有效改善石墨烯的电化学性能,修饰电极实现了对HQ、CC和RC的同时检测,线性范围在5.5～43.06μmol/L和90.91～245.28μmol/L之间,检出限为1.83μmol/L(信噪比为3)。
Graphite oxide (GO) was prepared by a modified Hummers method with the graphite as raw materials,and then the sulfer and nitrogen co-doped graphene (SNG) were fabricated by one-step hydrothermal method using GO and ammonium thiocyanate as the precursors.The scanning electron microscopy (SEM),X-ray diffraction (XRD) and Raman were used to characteristic the morphology and structure of SNG.The results shown that the S and N were successfully doped into graphene lattice,co-doped graphene with the surface wrinkled,and formed the 3D porous architecture.The electrochemical behavior of HQ,CC and RC on the SNG modified electrode (SNG-180/GCE) were investigated by electrochemical impedance spectroscopy (EIS),cyclic voltammetry (CV) and differential pulse voltammetry (DPV) techniques.The results indicated that the electrochemistry property of graphene could be effectively improved by co-doping,the modified electrode can be used for the simultaneous determination of HQ,CC and RC,and the linear response ranges were 5.5～43.06μmol/L and 90.91～245.28μmol/L with the detection limits (S/N=3) were1.83μmol/L.
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基金资助
甘肃省科技计划资助(18JR3RG203)
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