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Modified electrode for detecting pyrocatechol and hydroquinone and preparation method thereof

A technology of hydroquinone and modified electrodes, which is applied in the field of electrochemical detection, can solve the problems of complex operating conditions, low sensitivity, and time-consuming, and achieve the effects of easy preparation conditions, simple preparation methods, and high sensitivity

Active Publication Date: 2014-07-02
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the methods for detecting such substances mainly include high performance liquid chromatography, gas chromatography, spectrophotometry, fluorescence method and electrochemiluminescence method. Limits its application in the detection of catechol and hydroquinone
[0003] The electrochemical method has the advantages of fast response, high sensitivity, good selectivity, low cost, easy operation, and time saving, which provides an ideal choice for the simultaneous detection of two isomers of catechol, but due to the It is too close to the oxidation peak of hydroquinone on the unmodified electrode, so it is difficult to realize the simultaneous detection of the two compounds using the unmodified bare electrode

Method used

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  • Modified electrode for detecting pyrocatechol and hydroquinone and preparation method thereof
  • Modified electrode for detecting pyrocatechol and hydroquinone and preparation method thereof
  • Modified electrode for detecting pyrocatechol and hydroquinone and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Blend 1 mg of graphene (G) and 1 mg of carboxylated multi-walled carbon nanotubes (MWCNTs) in 1 mL of double-distilled water, ultrasonically disperse, add 0.01 mL of a 20% PDDA aqueous solution to the dispersion), and ultrasonically disperse A uniform black dispersion (PDDA / MWCNTs / G) was obtained; the glassy carbon electrode (GCE) was sequentially polished with metallographic sandpaper and aluminum oxide powder on suede until the GCE was polished to a mirror surface, and then the surface of the GCE was treated with twice distilled water Rinse, put the GCE after preliminary cleaning in double-distilled water, wash it in an ultrasonic cleaner for 20s, and dry it at room temperature for later use; 2 Drop-coated on the surface of GCE and dried at room temperature to prepare PDDA / MWCNTs / G modified glassy carbon electrode.

[0038] Wherein the preparation method of graphene is Hummers method; The preparation method of the carboxylated multi-walled carbon nanotube is: take the...

Embodiment 2

[0040] Blend 3mg G and 1mg MWCNTs in 2mL double distilled water, ultrasonically disperse, add 0.04mL PDDA aqueous solution with a mass concentration of 20% to the dispersion), and ultrasonically disperse to obtain a uniform black dispersion (PDDA / MWCNTs / G); Grind the glassy carbon electrode (GCE) sequentially with metallographic sandpaper and aluminum oxide powder on suede until the GCE is polished to a mirror surface, then rinse the surface of the GCE with secondary distilled water, and place the GCE after preliminary cleaning on the secondary surface. Wash in distilled water for 60s in an ultrasonic cleaner, dry at room temperature, and set aside; 2 Drop-coated on the surface of GCE and dried at room temperature to prepare PDDA / MWCNTs / G modified glassy carbon electrode.

[0041] The preparation method of graphene and carboxylated multi-walled carbon nanotubes is the same as in Example 1.

Embodiment 3

[0043] Blend 1mg G and 3mg MWCNTs in 2mL double distilled water, ultrasonically disperse, add 0.02mL PDDA aqueous solution with a mass concentration of 20% to the dispersion), and ultrasonically disperse to obtain a uniform black dispersion (PDDA / MWCNTs / G); Grind the glassy carbon electrode (GCE) sequentially with metallographic sandpaper and aluminum oxide powder on suede until the GCE is polished to a mirror surface, then rinse the surface of the GCE with secondary distilled water, and place the GCE after preliminary cleaning on the secondary surface. Wash in distilled water for 40s in an ultrasonic cleaner, dry at room temperature, and set aside; 2 Drop-coated on the surface of GCE and dried at room temperature to prepare PDDA / MWCNTs / G modified glassy carbon electrode.

[0044] The preparation method of graphene and carboxylated multi-walled carbon nanotubes is the same as in Example 1.

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Abstract

The invention discloses a modified electrode for detecting pyrocatechol and hydroquinone. The modified electrode comprises a substrate electrode and phthalic acid ethylene glycol diacrylate-carboxylate multiwalled carbon nanotube-graphene which is attached to the substrate electrode. The invention also discloses a method for preparing the modified electrode. The modified electrode can be used for detecting the pyrocatechol and hydroquinone. The linear range of pyrocatechol detection is 5.0*10<-7>-4.0*10 mol / L, and the detection limit is 1.8*10<-8>mol L-1; the linear range of hydroquinone detection is 5.0*10<-7>-4.0*10<-4> mol / L, and the detection limit is 2.0*10<-8> mol L-1. The modified electrode is simple in preparation method, the preparation conditions are easily controlled and realized, the linear detection range is wide, the detection limit is low, and the detection method is high in stability and high in sensitivity.

Description

technical field [0001] The invention relates to a modified electrode capable of detecting catechol and hydroquinone and a preparation method thereof, belonging to the technical field of electrochemical detection. Background technique [0002] Catechol (CT) and hydroquinone (HQ) are isomers of quinone with similar structures and properties, which widely exist in people's daily life. Since the two often coexist in the environmental system and have high toxicity at low concentrations, it is particularly important to establish a detection method with good stability and high sensitivity. At present, the methods for detecting such substances mainly include high performance liquid chromatography, gas chromatography, spectrophotometry, fluorescence method and electrochemiluminescence method. Limit its application in the detection of catechol and hydroquinone. [0003] The electrochemical method has the advantages of fast response, high sensitivity, good selectivity, low cost, easy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30G01N27/48
Inventor 王宗花赵凯夏建飞宋岱珉张菲菲夏霖迟德玲李延辉夏延致夏临华
Owner QINGDAO UNIV
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