Bio‐based Nanomaterial in Carefully Designed Carbon Paste Electrode for the Detection of Methyl Orange

Abstract

Abstract Al 2 O 3 is an electrical insulator material with high thermal conductivity and low toxicity. In this study, we combined the properties of Al 2 O 3 and orange peel (OP) to form a hydrothermally synthesized nanomaterial, resulting in an excellent nanocomposite (AlOP) with favorable electrochemical properties compared to those of their separate materials. AlOP exhibited a compact morphology with relatively high porosity and varying shapes, attributed to the blending of aluminum oxide nanoparticles in the OP matrix. The structural properties of this nanocomposite have facilitated the modification of the carbon paste electrode (CPE) for the detection of methyl orange, an anionic dye of environmental significance. This electrochemical sensor has demonstrated high sensitivity, selectivity, stability, rapid response, and remarkable reproducibility for the detection of methyl orange (MO) with detection limits of 3.23×10 −8 and 1.26×10 −7 mol. L −1 in deionized and spring waters with molarities of 2 to 1.2 μM. Therefore, the developed CPE/AlOP sensor has the capacity for detecting anionic dye from multiple systems without affecting its efficiency.