Methyl Parathion Detection Using SnS₂/N, S–Co-Doped Reduced Graphene Oxide Nanocomposite

Abstract

The rapid and ultralow detection of toxic organophosphate chemicals is a well-known, important step to reduce adverse health issues and yet also remains challenging. Here, we show electrochemical detection of methyl parathion (MP) using SnS 2 nanosheets supported in a N, S-codoped reduced graphene oxide nanocomposite (SnS 2 /NS−RGO) in a neutral medium. The SnS 2 /NS−RGO is obtained by one-pot hydrothermal synthesis and modified onto a glassy carbon electrode (GCE) for electrochemical MP detection ability. The effects of SnS 2 in NS−RGO showed a substantial reduction in the electron resistivity and increase in the acceleration of electron mobility. The cyclic voltammetry investigation of SnS 2 /NS−RGO to the MP detection showed a superior electrochemical detection property, while unmodified GCE, SnS 2 , and NS−RGO yielded unsatisfactory results. Thus, the SnS 2 /NS−RGO showed the best performance in terms of the sensitivity (4.033 μA μM −1 cm −2 ), limit of detection (0.17 nM), accuracy, and stability. In practical detection, the SnS 2 /NS−RGO sensing retained satisfactory recovery of MP added in river water and black grape samples.

Novel Additive Manufactured Multielectrode Electrochemical Cell with Honeycomb Inspired Design for the Detection of Methyl Parathion in Honey Samples

“…For the analytical monitoring, the first redox process (R1) was used. This response mechanism presented in Figure C can be attributed to the reversible reduction (R1) of hydroxylamine (NHOH) which is converted to nitro (NO) in the MP that involves 2 e – and 2H + , as observed in the literature. , To present a high signal for the quantification of the analyte of interest, the square wave voltammetry technique was chosen.…”

Rational design of a novel MOF-based ternary nanocomposite for effectively monitoring harmful organophosphates in foods and the environment

“…Notably, the irreversible reduction peak of MP that appeared in the first circle was chosen here to compare the electrocatalytic property due to the 4e − and 4H + transport making a more sensitive peak current. 42 From Fig. 3C, a higher cathodic peak current signal for MP was observed owing to the superior electrocatalytic performance of PtNPs/UiO-66-NH 2 /MWCNTs (115.4 μA), while the corresponding cathodic peak currents for bare GCE, PtNPs/GCE and UiO-66-NH 2 /MWCNTs/GCE were only 11.8, 24.0, and 62.3 μA, respectively.…”

Polypyrrole‐Reinforced N,S‐Doping Graphene Foam for Efficient Solar Purification of Wastewater

“…Obviously, the concentrations of primary ions (Fe 3þ , Cu 2þ , Cr 6þ , Na þ , K þ ) in the wastewater have been reduced by two to six orders of magnitude after evaporation by N,S-GO/PPy foam, which is below the salinity level defined by the World Health Organization (WHO) for safe drinking water. [16] Especially, the purified water evaporated from the K 2 Cr 2 O 7 /H 2 SO 4 solution exhibited neutral (pH ¼ 7) and extremely low ion concentration of toxic Cr 6þ ions as 0.004 mg L À1 , which is much lower than the value of maximum contaminant limits of WHO (0.1 mg L À1 ) and the permissible limit (0.05 mg L À1 ) for potable water. [24] The photos of wastewaters before, after evaporation and collected purification water are shown in Figure 3c.…”

“…[ 15 ] The disorder degrees and electronic conductive of the GO would be improved by doping the N and S atoms, resulting in a more active sites and larger solar absorption. [ 16 ] This indicates that the N,S‐GO would possess a higher photothermal conversion efficiency and excellent stability for treating wastewater. However, for treating solutions with heavy metal ions such as Cr 6+ , Pb 2+ , and Cu 2+ , the toxic ions remain at the condensed solutions and hardly remove after solar evaporation.…”