Voltammetric sensing of Pb(II) using a glassy carbon electrode modified with composites consisting of Co 3 O 4 nanoparticles, reduced graphene oxide and chitosan
作者： Yinxiu Zuo , Jingkun Xu , Fengxing Jiang , Xuemin Duan , Limin Lu
DOI: 10.1016/J.JELECHEM.2017.07.046
关键词: Scanning electron microscope 、 Nanocomposite 、 Nuclear chemistry 、 Adsorption 、 Nanoparticle 、 Oxide 、 Chemistry 、 Chitosan 、 Analytical chemistry 、 Graphene 、 X-ray photoelectron spectroscopy
摘要: Abstract A sensitive Pb(II) sensor was fabricated based on Co3O4/reduced graphene oxide/chitosan (Co3O4/rGO/chitosan) nanocomposite modified glassy carbon electrode (GCE). The Co3O4/rGO material synthesized through in situ growth of Co3O4 nanoparticles (NPs) GO and subsequent hydrazine reduction process. Scanning electron microscopy (SEM) transmission (TEM) show that NPs with a diameter around 100 nm are attached rGO sheets. structures compositions were further characterized by X-ray photoelectron spectroscopy (XPS) diffraction (XRD). Many experimental parameters, such as pH value, deposition time potential optimized. Under optimal conditions, the calibration plot for Pb(II), data acquired at − 0.556 V (vs. SCE) is linear concentration range from 1.0 to 200.0 nM. Combining good conductivity high surface area rGO, strong adsorption ability NPs, excellent complex-forming chitosan, nanocompsite provides senor detection limit 0.35 nM. Moreover, positively charged chitosan can interact negatively increase stability nanocomposite. hybrid new opportunity vegetable analysis.
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