基于还原氧化石墨烯/羧甲基纤维素/谷胱甘肽修饰电极的 Cd（II）超灵敏检测
Ultra sensitive detection of Cd (II) using reduced graphene oxide/carboxymethyl cellulose/glutathione modified electrode.
机构信息
Environmental Research Lab, PG and Research Department of Chemistry, Alagappa Government Arts College, Karaikudi, 630 003, Tamil Nadu, India.
School of Chemistry, Bharathidasan University, Thiruchirapalli, 620 024, Tamil Nadu, India.
出版信息
Carbohydr Polym. 2018 Oct 1;197:366-374. doi: 10.1016/j.carbpol.2018.06.024. Epub 2018 Jun 6.
The present work describes the electrochemical detection of Cd using reduced graphene oxide (rGO), carboxymethyl cellulose (CMC) and glutathione (GSH) modified glassy carbon electrode (GCE) by Square Wave Anodic Stripping Voltammetry (SWASV). The prepared nanocomposite was characterized by X-ray diffraction (XRD), RAMAN, Scanning Electron Microscopy (SEM), Fourier Transform Infrared (FTIR) and X-ray photoelectron spectroscopy (XPS), Cyclic Voltammetry (CV) and Electrochemical Impedance Spectroscopy (EIS). The influence of experimental parameters such as effect of pH, choice of supporting electrolyte, deposition time and deposition potential, were optimized. Under the optimized conditions, the linear relationship between the current intensity and Cd concentration (2-20 nM) was I (μA) = -6.78 (c/nM) + 4.547 (R = 0.996). The detection limit and sensitivity achieved for the modified electrode were 0.05 nM and 4.5 μA/nM respectively. Finally, rGO/CMC/GSH/GCE was successfully demonstrated for the detection of Cd in real samples, and the results were compared with AAS analysis.
本工作通过方波阳极溶出伏安法（SWASV）描述了使用还原氧化石墨烯（rGO）、羧甲基纤维素（CMC）和谷胱甘肽（GSH）修饰的玻碳电极（GCE）电化学检测 Cd。通过 X 射线衍射（XRD）、拉曼光谱（RAMAN）、扫描电子显微镜（SEM）、傅里叶变换红外光谱（FTIR）和 X 射线光电子能谱（XPS）、循环伏安法（CV）和电化学阻抗谱（EIS）对制备的纳米复合材料进行了表征。优化了实验参数的影响，如 pH 值的影响、支持电解质的选择、沉积时间和沉积电位。在优化条件下，电流强度与 Cd 浓度（2-20 nM）之间呈线性关系 I（μA）=-6.78（c/nM）+4.547（R=0.996）。修饰电极的检测限和灵敏度分别为 0.05 nM 和 4.5 μA/nM。最后，成功地将 rGO/CMC/GSH/GCE 用于实际样品中 Cd 的检测，并将结果与 AAS 分析进行了比较。
Zotero 插件