A Novel Highly Sensitive Electrochemical Nitrite Sensor Based on a AuNPs/CS/Ti3C2 Nanocomposite

Abstract

Nitrite is common inorganic poison, which widely exists in various water bodies and seriously endangers human health. Therefore, it is very necessary to develop a fast and online method for the detection of nitrite. In this paper, we prepared an electrochemical sensor for highly sensitive and selective detection of nitrite, based on AuNPs/CS/MXene nanocomposite. The characterization of the nanocomposite was demonstrated by scanning electron microscopy (SEM), a transmission electron microscope (TEM), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). Under the optimized conditions, the fabricated electrode showed good performance with the linear range of 0.5–335.5 μM and 335.5–3355 μM, the limit of detection is 69 nM, and the sensitivity is 517.8 and 403.2 μA mM−1 cm−2. The fabricated sensors also show good anti-interference ability, repeatability, and stability, and have the potential for application in real samples.

Polyaniline-Supported Nickel Oxide Flower for Efficient Nitrite Electrochemical Detection in Water

“…The World Health Organization (WHO) recommended that the amount of nitrite in drinking water must be less than 3 mg L −1 . Consequently, an increase in nitrite concentration levels causes methemoglobin to be produced and reduces red blood cell oxygen-carrying capacity [ 3 ]. Moreover, nitrite can generate carcinogenic nitroso compounds, such as N-nitrosamines in the intestine and stomach [ 4 ].…”

The enhanced electrocatalytic performance of nanoscopic Cu6Pd12Fe12 heterometallic molecular box encaged cytochrome c

“…The entries in Table 1 show the excellent capabilities of the Cyt-c@Cu-HMHMB composite for the electrochemical sensing of nitrite. 40,[69][70][71][72][73][74][75][76] The practical value of an electrochemical sensor is significantly influenced by the reproducibility and repeatability of its estimates. The reproducibility of the Cytc@Cu-HMHMB nanocomposite-based electrode towards the detection of nitrite was assessed via DPV analysis.…”

Highly Sensitive Graphene-Based Electrochemical Sensor for Nitrite Assay in Waters

“…Among these, due to its rapidity, sensibility and low costs, the electrochemical aproach has become one of the most popular and extensively used analytical tools [26]. To create electrochemical sensors with increased sensitivity and accuracy for nitrite detection, different nanomaterials have been embedded on electrode surfaces: nickel/PDDA/reduced graphene oxide [27], Ag-Fe 3 O 4 -graphene oxide magnetic nanocomposites [28], Fe 3 O 4 -reduced graphene oxide composite [29], metalorganic framework derived rod-like Co@carbon [30], La-based perovskite-type lanthanum aluminate nanorod-incorporated graphene oxide nanosheets [31], cobalt oxide decorated reduced graphene oxide and carbon nanotubes [32], gold-copper nanochain network [33], carbon nanotube (CNTs), chitosan and iron (II) phtalocyanine (C 32 H 16 FeN 8 ) composite [34]; gold nanoparticles/chitosan/MXenes nanocomposite [35], worm-like gold nanowires and assembled carbon nanofibers-CVD graphene hybrid [36]; photochemically-made gold nanoparticles [37], or graphene nanoparticles [38]. Among these, the special properties of graphene are unequivocal and long-time recognized [39], justifying their extensive applicability and usage in sensors technology [40,41].…”