Electrochemical sensor based on laser-induced preparation of MnOx/rGO composites for simultaneous recognition of hydroquinone and catechol

In this study, a simple, efficient and low-cost method based on laser-induced graphene oxide and manganese gluconate (MG) was proposed to prepare manganese oxide/reduced graphene oxide (MnOx/rGO) composites for modifying screen-printed electrodes (SPE), which was used to simultaneously detect hydroquinone (HQ) and catechol (CC). It is characterized by SEM, TEM, XPS, etc. In-situ embedding manganese oxide within rGO superior electrochemical performance, low-cost and reusable, etc. Cyclic voltammetry (CV) was used to evaluate the electrochemical behavior of HQ and CC in the potential range from −0.2 to 0.6 V. The linear responses range was 0.5 to 200 μM, and the limits of detection (LOD) were 0.049 and 0.028 μM, respectively. MnOx/rGO nanocomposites can effectively detect hydroquinone and catechol in hazardous water pollutants by differential pulse voltammetry (DPV).