MnCo2O4 decorated (2D/2D) rGO/g-C3N4-based Non-Enzymatic sensor for highly selective and sensitive detection of Chlorpyrifos in water and food samples

An effective and accurate detection of Chlorpyrifos (CPS), a well-known organophosphorus pesticide became essential in our modern world to control environmental pollution. Analytical detection of CPS is recommended for appropriate environmental supervision and to elude all health-related problems in smoke-stock spheres. To achieve this goal, an ecofriendly and one step combustion route for the synthesis of reduced graphene oxide-graphitic carbon nitride (rGO/g-C3N4) 2D/2D modified manganese cobaltite (MnCo2O4) nanocomposite was designed in this study. With the combination of properties like relatively larger surface area of rGO/g-C3N4 and excellent conductivity and good biocompatibility of rGO along with MnCo2O4 nanoparticles, a highly sen-sitive CPS sensor was aimed. The nanocomposite was identified using Powder x-ray diffraction (PXRD), Field emission scanning electron microscopy (FESEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), Transmission electron microscopy (TEM), Raman Spectroscopy and BET analysis. In the TEM image, a distinct surface of the g-C3N4 can be seen which acts as a bridge between rGO layers and MnCo2O4 nanoparticles. Highest conductivity of the nanocomposite was showcased using the electronic impe-dance spectroscopy (EIS) technique that supported the idea of being a potential sensor material. Under opti-mum environment, the designed non-enzymatic electrochemical sensor was able to sense CPS at lower detection limit (LOD) of 0.14 x 10(-12)M (0.322 x 10(-6) mu g/ml) with a wider range of 20 mu M to 30 pM at room temperature. Furthermore, the present sensor showed desirable selectivity and superior stability with good reproducibility indicating its effective sensing capability for environmentally toxic CPS pesticide.

Automated summary

An ecofriendly and one step combustion route was designed to synthesize a two-dimensional/two-dimensional modified manganese cobaltite nanocomposite for the highly sensitive detection of CPS pesticide. The properties of the nanocomposite were characterized using various analytical techniques, and its effective sensing capability for CPS at room temperature was demonstrated.