Method for simultaneously detecting three isomers of benzenediol on basis of sensor of thionine functionalized carbon nanotube

Abstract

The invention discloses a method for simultaneously detecting three isomers of benzenediol on basis of a sensor of a thionine functionalized carbon nanotube. The method comprises the following steps of: carrying out chemical reaction on a carboxylated multiwalled carbon nanotube and thionine with amino to form an amidated carbon nanotube, and modifying the amidated carbon nanotube on a glassy carbon electrode to form a modification layer so as to simultaneously detecting the three isomers of the benzenediol. Researches show that by modifying the electrode through the multiwalled carbon nanotube / thionine, the electrochemical response of the isomers of the benzenediol is greatly increased, and a feasible method is provided for simultaneously detecting the three isomers of the benzenediol.

Description

[0001] technical field [0002] The invention relates to a sensor based on thionine functionalized carbon nanotubes for simultaneously detecting three isomers of quinone. Background technique [0003] Due to their large specific surface area, ultra-lightweight and high mechanical toughness, adsorption performance, electrical properties, thermal stability and other properties, carbon nanotubes have become a hot research topic in the fields of physics, chemistry, materials and biology. The unique atomic structure of carbon nanotubes makes them exhibit metal or semiconductor properties. Using this unique electronic property, carbon nanotubes can be used as modified electrodes. But its disadvantage is that it is easy to agglomerate in water and most organic solvents. [0004] Thionine is a biological dye, which can be used as an electron transfer medium in enzyme-based electrochemical sensors. It has good water solubility and electrical conductivity. The water solubility of th...

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But its disadvantage is that it is easy to agglomerate in water and most organic solvents

Although there are some methods for the simultaneous quantitative determination of quinone isomers, such as chromatography and spectrometry, due to the expensive instruments used in the method, large consumption of reagents, and high requirements for sample pretreatment, it is difficult for the simultaneous detection of quinone in wastewater. The three isomers of phenol have certain limitations

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