三维石墨烯/纳米银复合物修饰电极的制备及对岩白菜素的测定  

Preparation of three-dimensional graphene/nano-silver composite modified electrode and its application for determination of bergenin

作　　者：梁宁刚 李娟娟[1] 蔡卓[1] 叶丹妮[1] LIANC Ning-gang;LI Juan-juan;CAI Zhuo;YE Dan-ni(School of Chemistry and Chemical Engineering, Guangxi University,Nanning 530004, Chin)

机构地区：[1]广西大学化学化工学院,广西南宁530004

出　　处：《化学研究与应用》2018年第5期745-750,共6页Chemical Research and Application

基　　金：广西自然科学基金项目(2015GXNSFAA139239)资助

摘　　要：以水热合成法制备纳米银,并与三维石墨烯(3DGR)复合制得3DGR/Ag材料,再滴涂于玻碳电极(GCE)表面,制成3DGR/Ag/GCE修饰电极。采用紫外可见光谱法(UV-Vis)、扫描电镜(SEM)、X射线衍射法(XRD)、电化学交流阻抗谱(EIS)对修饰电极材料进行了表征。以循环伏安法(CV)、差分脉冲伏安法(DPV)和恒电位库伦分析法(CPC)研究了岩白菜素在该修饰电极上的电化学行为。实验结果表明:在0.20mol·L^(-1)Na_2HPO_4-NaH_2PO_4溶液(pH5.8)中,该修饰电极对岩白菜素的氧化反应有催化增敏作用,氧化峰电流与岩白菜素浓度在2.0×10^(-6)mol·L^(-1)~1.0×10^(-4)mol·L^(-1)范围内呈现良好的线性关系,检出限(S/N=3)为1.62×10^(-7)mol·L^(-1)。将3DGR/Ag/GCE用于岩白菜素片的测定,回收率在99.8%~106.8%之间。该方法灵敏度高,检出限低,操作简便,可用于实际样品的测定。Nano-silver was prepared by hydrothermal synthesis, and 3DGR/Ag was obtained by combining nano-silver with three-di- mensional graphene （3 DGR）and then coated on the glassy carbon electrode （GCE）to make 3 DGR/Ag/GCE modified electrode. The modified electrode materials were characterized by UV visible spectroscopy（ UV-Vis）, scanning electron microscopy（ SEM）, X-ray diffraction（XRD） and electrochemical impedance spectroscopy（EIS）. The electrochemical behavior of bergenin at the modified e- lectrode were studied by cyclic voltammetry（ CV）, differential pulse voltammetry（DPV） and controlled potential coulometry analysis method（CPC）. The experimental results showed that the modified electrode was sensitive to the oxidation reaction of bergenin in 0. 20mol·L^-2 Na2 HPO4-Nail2PO4 solution （pH5.8）, the peak current and bergenin content showed a good linear relationship in the range of 2. 0×l0 6mol · L^-1 -1.0×10^^-4mol · L^-1 range,the detection limit was 1.62×10 7 mol ·L^-7（S/N=3）. 3DGR/Ag/ GCE was used for the determination of bergenin in tablets, the recovery- was 99. 8 % - 106. 8%. The method was of high sensitivity-, low detection limit and simple operation, and could be used for the determination of bergenin in real samples.

关 键 词：修饰电极 纳米银 三维石墨烯 岩白菜素 

分 类 号：O657.1[理学—分析化学]