Abstract
In this paper, a new nanocomposite AuNPs/MXene/ERGO was prepared for sensitive electrochemical detection of nitrite. The nanocomposite was prepared by a facile one-step electrodeposition, HAuCl4, GO and MXene mixed in PBS solution with the applied potential of −1.4 V for 600 s. The modified material was characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD) and cyclic voltammetry (CV). The electrochemical behavior of nitrite at the modified electrode was performed by CV and chronoamperometry. The AuNPs/MXene/ERGO/GCE showed a well-defined oxidation peak for nitrite at +0.83 V (Vs. Ag/AgCl) in 0.1 M phosphate buffer solution (pH 7). The amperometric responses indicated the sensor had linear ranges of 0.5 to 80 μM and 80 to 780 μM with the LOD (0.15 μM and 0.015 μM) and sensitivity (340.14 and 977.89 μA mM−1 cm−2), respectively. Moreover, the fabricated sensor also showed good selectivity, repeatability, and long-term stability with satisfactory recoveries for a real sample. We also propose the work that needs to be done in the future for material improvements in the conclusion.
Highlights
The demand of human beings for fish will reach 102 million tons by 2025, and aquaculture is one of the solutions to meet this projected requirement
Icp vs. v1/2 from 20 and 200 mV/s. These results reveal that the electrochemical oxidation of nitrite at Au nanoparticles (AuNPs)/MXene/ERGO/glass carbon electrode (GCE) is a typical diffusion-controlled process
These results reveal that the electrochemical oxidation of trite at AuNPs/MXene/ERGO/GCE is a typical diffusion-controlled process
Summary
The demand of human beings for fish will reach 102 million tons by 2025, and aquaculture is one of the solutions to meet this projected requirement. C@In2 O3 modified electrodes shows a linear range from 5 to 240 μM with a LOD of 0.08 μM for nitrite detection [20]. Muthumariappan et al [21] developed a nitrite sensor based on a GO/Mn3 O4 micro cubes modified screen-printed electrode, with a sensor performance of 0.1–1300 μM linear range with a. Jeena et al [23] proposed an electrochemical nitrite sensor based on M-molybdate modified GCE with a linear range of 0.9–325.2 μM, the fabricated sensor that can detect hydroquinone and Hg2+. These reports prove that a nanomaterial-modified electrode is effective for the detection of nitrite. 0.5–80 and 80–780, and the stability, repeatability and selectivity of the modified electrode are very satisfactory
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