An electrochemical sensor for detecting vanillin and a preparation method and application thereof

Abstract

This invention belongs to the field of electrochemical sensors and discloses an electrochemical sensor for detecting vanillin, its preparation method, and its application. NiMoO4 powder is prepared, and NiMoO4@CoWO4 is prepared using NiMoO4 powder, Co(NO3)2·6H2O, and Na2WO4·2H2O. A bare glassy carbon electrode (GCE) is polished to a mirror finish on chamois leather using 0.05μm and 0.30μm alumina powders, respectively. After rinsing with water and ethanol, it is dried for later use. 4.0–10.0 mg of the prepared NiMoO4@CoWO4 composite material, 0.5–2.0 mg of polyvinylidene fluoride, and 0.8–2.0 mL of N-methylpyrrolidone solution are weighed and ultrasonically vibrated for 0.5–2.0 h. 4–10 μL of the above solution is drop-coated onto the surface of the glassy carbon electrode and dried to obtain NiMoO4@CoWO4 / GCE. The NiMoO4@CoWO4 composite material-modified electrode is used as the working electrode, Ag / AgCl as the reference electrode, and platinum wire as the counter electrode. This invention exhibits high sensitivity and a wide detection range for vanillin detection, along with good selectivity. The preparation process is simple and the conditions are easy to control, significantly improving the electrochemical performance of the composite material. It can be used for the determination of vanillin in food and food additives, showing promising application prospects.

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