Journal
RARE METALS
Volume 40, Issue 7, Pages 1727-1737Publisher
NONFERROUS METALS SOC CHINA
DOI: 10.1007/s12598-020-01659-z
Keywords
Pb(II); Electrochemical detection; Au; g-C3N4; Surface plasmon resonance; Visible light
Funding
- Key Project of National Natural Science Foundation [U1901212]
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A plasmonic photo-assisted electrochemical sensor was developed with Au anchored on 2D g-C3N4/rGO nanosheets, showing high sensitivity for detecting trace lead ions under visible light illumination. The sensor had a low detection limit of 0.1 nmol·L-1 and showed promising practical application potential through interference studies and real soil sample detection.
In this paper, a plasmonic photo-assisted electrochemical sensor, Au anchored on two-dimensional (2D) graphitic carbon nitride (g-C3N4)/reduced graphene oxide (rGO) nanosheets (Au/g-C3N4/rGO), was facile fabricated. The morphology and structure of the composite are characterized by transmission electron microscope, X-ray photoelectron spectroscopy, X-ray diffraction and ultraviolet-visible spectrophotometer (UV-Vis). Based on the semiconductor of g-C3N4 and optical properties of surface plasmon resonance for Au, the as-prepared Au/g-C3N4/rGO showed high sensitivity for the detection of trace lead ion [Pb(II)] by differential pulse anodic stripping voltammetry in the presence of visible light illumination. Under optimized conditions, the limit of detection (signal-to-noise ratio (S/N) = 3) Pb(II) detection can be low to 0.1 nmol center dot L-1. In addition, the interference research and real soil sample detection were measured to confirm the possibility of practical applications.
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