Abstract
A Nb4C3Tx (MXene)-modified glassy carbon electrode was used for the electrochemical detection of Pb2+ ions in aqueous media. The sensing platform was evaluated by anodic stripping analysis after optimizing the influencing factors such as pH, deposition potential, and time. The large interlayer spacing, high c lattice parameter and higher conductivity of Nb4C3Tx compared to other MXenes enhance the electrochemical detection of Pb2+. The developed sensor can reach a detection limit of 12 nM at a potential ∼−0.6 V. Additionally, the developed sensor showed promising selectivity in the presence of Cu2+ and Cd2+, and stability for at least 5 cycles of continuous measurements with good repeatability. This work demonstrates the potential applications of Nb4C3Tx towards the development of effective electrochemical sensors.
Highlights
Lead (Pb) is a common heavy metal, used in a variety of industrial processes and anthropogenic activities.[1]
We evaluate the electrochemical performance of Nb2CTx and Nb4C3Tx on the glassy carbon electrode (GCE) and their application as sensing platform for the detection of Pb2+ in the aqueous media
The high resolution transmission electronic microscopy (TEM) (HR-TEM) images of DL-Nb2CTx and DL-Nb4C3Tx shown in the inset shows the dspacing $11.5 Aand $15 A, respectively.[36]
Summary
Lead (Pb) is a common heavy metal, used in a variety of industrial processes and anthropogenic activities.[1]. We evaluate the electrochemical performance of Nb2CTx and Nb4C3Tx on the glassy carbon electrode (GCE) and their application as sensing platform for the detection of Pb2+ in the aqueous media. Square wave anodic stripping voltammetry (SWASV) measurements were used to detect Pb2+ in acetate buffer solution (0.1 M, pH 5.0) containing different concentration Pb2+.
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