MOF-derived Co3O4/FeCo2O4 incorporated porous biomass carbon: Simultaneous electrochemical determination of dopamine, acetaminophen and xanthine

A novel sensing system was constructed by biomass carbon/MOF-derived Co3O4/FeCo2O4 (BC/Co3O4/FeCo2O4) composite decorated with glassy carbon electrode (GCE) for exploiting to determine dopamine (DA), acetaminophen (AC), and xanthine (XA) simultaneously. The BC/Co3O4/FeCo2O4 composite was synthesized via a facile in-situ growth process and calcination treatment, coupled with hydrothermal reaction. This composite could appreciably enlarge the electrochemically active surface area of as-prepared sensor to promote electron transfer resulting in enhanced response signals. Applying BC/Co3O4/FeCo2O4/GCE sensor under the optimum conditions, the differential pulse voltammetry (DPV) current responses vs. concentration are linear in the wider ranges of 0.1–250 μM, 0.1–220 μM, and 0.5–280 μM, along with low detection limits (LOD, S/N = 3) of 0.04587 μM, 0.02886 μM, and 0.1209 μM for DA, AC and XA correspondingly. Moreover, the proposed sensor exhibited a satisfying selectivity, stability and reproducibility as well. Finally, this sensor had been utilized to detect DA, AC and XA successfully in real samples with satisfactorily apparent recoveries, providing a promising application for further sensing analysis.