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. 2019 Oct 23;4(19):18398-18404.
doi: 10.1021/acsomega.9b02658. eCollection 2019 Nov 5.

Fabricated Electrochemical Sensory Platform Based on the Boron Nitride Ternary Nanocomposite Film Electrode for Paraquat Detection

Jiangyi Zhang  1 , Zhenfeng Lin  1 , Yuan Qin  1 , Yangzi Li  1 , Xin Liu  1 , Qi Li  1 , Huayu Huang  1
Affiliations

Fabricated Electrochemical Sensory Platform Based on the Boron Nitride Ternary Nanocomposite Film Electrode for Paraquat Detection

Jiangyi Zhang et al. ACS Omega. .

Abstract

Hexagonal boron nitride (BN), an effective diffusion material for mass transport, was functionalized with molybdenum disulfide (MoS2) and Au nanoparticles (Au NPs). Then, the working electrodes with developed nanomaterials were applied to construct an electrochemical paraquat sensor. BN was prepared using a solid-state synthesis method combined with solvent-cutting. The electrochemical properties of the BN/MoS2/Au NP-based glassy carbon electrode (GCE) were investigated using differential pulse voltammetry and cyclic voltammetry. An excellent response signal to paraquat was found from 0.1 to 100 μM with a limit of detection of 0.074 μM, and it had acceptable reproducibility (relative standard deviation = 2.99%, n = 5) and good anti-interference ability. The modified GCE showed superior performance owing to the synergistic effects among all three given nanomaterials. With the proposed method, paraquat in grass samples from an orchard was then investigated. The results of the electrochemical analysis agreed with those of experiments and obtained a 96.28% confidence level via high-performance liquid chromatography, exhibiting relatively high stability. Therefore, the fabricated sensor can be a candidate for the determination of paraquat.

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Conflict of interest statement

The authors declare no competing financial interest.

Figures

Figure 1
Figure 1
(A) XRD patterns of BN (blue) and MoS2 (red). (B) Raman spectra of BN (blue), MoS2 (red), and BN/MoS2/Au NPs (black).
Figure 2
Figure 2
SEM images of (A) BN by solvent cutting and (B) MoS2.
Figure 3
Figure 3
TEM images of (A) MoS2, (B) BN by solvent cutting, (C) Au NPs, and (D) BN/MoS2/Au NPs.
Figure 4
Figure 4
DPV signals of PB (0.1 M, pH = 8.5) with paraquat (50 μM) on nonmodified, BN, MoS2, Au NPs, and BN/MoS2/Au NP-modified GCE.
Figure 5
Figure 5
(A) CVs signals on BN/MoS2/Au NP-modified GCE with 50 μM paraquat in pH 8.5 PB at a scan rate ranging from 10 to 300 mV s–1. (B) Relationship between peak currents and square root of the scan rate.
Figure 6
Figure 6
(A) Paraquat responses detected by DPV in PB solution (0.1 M) at a series of pH values. (B) Effect of pH on the current of paraquat determination (50 μM) in PB (0.1 M, pH = 8.5).
Figure 7
Figure 7
Effects of the BN/MoS2/Au NP coating solution volumes on the peak current of paraquat (50 μM) in PB (0.1 M, pH = 8.5).
Figure 8
Figure 8
Effects of the accumulation time on the peak current of paraquat determination (50 μM) with 5 μL BN/MoS2/Au NPs modifying GCE in PB (0.1 M, pH = 8.5).
Figure 9
Figure 9
(A) DPV responses of paraquat in pH 8.5 at the BN/MoS2/Au NP GCE with increasing concentration: 0, 0.1, 0.5, 1, 5, 10, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 90, and 100 μM, respectively. (B) Dependence of the DPV peak current on increasing paraquat concentration.
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