Keggin type heteropoly acid-polypyrrole-graphene composite material modified electrode as well as preparation method and application thereof

Abstract

The invention discloses a preparation method of a Keggin type heteropoly acid-polypyrrole-graphene composite material modified electrode. The preparation method comprises the following steps: selecting a glassy carbon electrode and carrying out surface treatment on the glassy carbon electrode; dropping graphene dispersion liquid on the surface of the glassy carbon electrode and putting the glassy carbon electrode under an infrared lamp to be dried to prepare a graphene modified electrode; immersing the prepared graphene modified electrode into a sulfuric acid solution containing polypyrrole and Keggin type heteropoly acid; scanning by using a cyclic voltammetry; after scanning, taking out the graphene modified electrode and eluting with water for the second time; drying at room temperature to obtain the Keggin type heteropoly acid-polypyrrole-graphene composite material modified electrode. The Keggin type heteropoly acid-polypyrrole-graphene composite material modified electrode prepared by the preparation method has a sensitive inhibition effect based on an oxidization reduction reaction of folic acid on the Keggin type heteropoly acid and can be used for determining the folic acid; compared with a common electrode, the Keggin type heteropoly acid-polypyrrole-graphene composite material modified electrode has the advantages of small over-potential, high sensitivity, good stability, high reproducibility and the like; a preparation process is simple, raw materials are easy to obtain and the cost is low.

Description

technical field [0001] The invention relates to a Keggin type heteropolyacid-polypyrrole-graphene composite material modified electrode, as well as a preparation method and application of the modified electrode. Background technique [0002] Folic acid (FA) is a widely existing water-soluble vitamin, which is an important electroactive substance in the human hematopoietic system and plays a key role. When the human body lacks FA, it will cause a series of diseases such as: anemia, neurasthenia, congenital deformities, and also increase the probability of heart disease and stroke. Reports have shown that low levels of folic acid in pregnant women can cause fetal malformations and affect bone and brain development. Therefore, sensitive and accurate detection of FA has aroused people's great attention. At present, some traditional methods for detecting FA have been reported, such as: high performance liquid chromatography, spectrophotometry, fluorescence, etc. However, these...

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Problems solved by technology

Nevertheless, there are still some disadvantages in the direct electrochemical detection of FA using ordinary electrodes, such as large overpotential and slow electron transport rate, etc.

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