• 文献标题:   Voltammetric sensing of Pb(II) using a glassy carbon electrode modified with composites consisting of Co3O4 nanoparticles, reduced graphene oxide and chitosan
  • 文献类型:   Article
  • 作  者:   ZUO YX, XU JK, JIANG FX, DUAN XM, LU LM, XING HK, YANG TT, ZHANG YS, YE G, YU YF
  • 作者关键词:   differential pulse anodic stripping voltammetry, co3o4, reduced graphene oxide, pb ii, electrochemical detection
  • 出版物名称:   JOURNAL OF ELECTROANALYTICAL CHEMISTRY
  • ISSN:   1572-6657 EI 1873-2569
  • 通讯作者地址:   Jiangxi Sci Technol Normal Univ
  • 被引频次:   16
  • DOI:   10.1016/j.jelechem.2017.07.046
  • 出版年:   2017

▎ 摘  要

A sensitive Pb(II sensor was fahrirated osan) nanocomposite modified glassy carbon electrode (GCE). The Co3O4/rGO material was synthesized through in situ growth of Co3O4 nanoparticles (NPs) on GO and subsequent hydrazine reduction process. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) show that Co3O4 NPs with a diameter of around 100 nm are attached on rGO sheets. The structures and compositions of Co3O4/rGO were further characterized by X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD). Many experimental parameters, such as pH value, deposition time and deposition potential were optimized. Under optimal conditions, the calibration plot for Pb(II), with data acquired at -0.556 V (vs. SCE) is linear in the concentration range from 1.0 to 200.0 nM. Combining the good conductivity and high surface area of rGO, strong Pb(II) adsorption ability of Co3O4 NPs, and excellent Pb(II) complex-forming ability of chitosan, the nanocompsite provides a sensitive Pb(II) senor with a detection limit of 0.35 nM. Moreover, the positively charged chitosan can interact with the negatively charged rGO to increase the stability of Co3O4/rGO nanocomposite. The hybrid nanocomposite Pb(II) senor provides new opportunity for vegetable analysis.