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Graphite electrode modified by beta-cyclodextrin and preparation method and application thereof

A graphite electrode and cyclodextrin technology, which is applied to electrochemical variables of materials, material analysis by electromagnetic means, and measurement devices, etc., can solve the problems of long detection period and complex processing, and achieve the effect of short detection period and simple processing.

Active Publication Date: 2019-11-26
XI'AN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a graphite electrode modified by β-cyclodextrin, which solves the problems of complex processing and long detection period in the existing instruments for detecting o-methoxyaniline

Method used

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  • Graphite electrode modified by beta-cyclodextrin and preparation method and application thereof
  • Graphite electrode modified by beta-cyclodextrin and preparation method and application thereof
  • Graphite electrode modified by beta-cyclodextrin and preparation method and application thereof

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Embodiment 1

[0105] This embodiment discloses a preparation method of a graphite electrode modified by β-cyclodextrin, which uses a pencil lead as a graphite rod, and is specifically implemented according to the following steps:

[0106] Step 1, prepare five pencil lead electrodes; specifically:

[0107] Step 1.1, cut the pencil lead into five 1.6cm-long pieces, each pencil lead was ultrasonically washed in nitric acid water (the ratio of nitric acid to water is 1:1), absolute ethanol and double distilled water for 5 minutes respectively, dry for later use;

[0108] Step 1.2, put the electrode prepared in step 1.1 into the paraffin melt for 20 minutes, take it out and dry it for later use;

[0109] Step 1.3, cut the copper wire into small pieces about 7cm long, scrape off the paint about 1cm long on the surface of both ends of the copper wire, after polishing, wind the end of the pencil lead processed in step 1.2, and fix it with AB glue.

[0110] Step 1.4, grind the electrode prepared i...

Embodiment 2

[0118] This embodiment discloses a preparation method of a graphite electrode modified by β-cyclodextrin, which uses a pencil core as a graphite rod, and implements according to the following steps:

[0119] Step 1, prepare pencil lead electrode (same as embodiment 1),

[0120] Step 2, preparation of β-cyclodextrin modified pencil lead electrode

[0121] Step 2.1, respectively prepare the concentration of 1.0×10 -4 mol L -1 , 1.5×10 -3 mol L -1 , 3.0×10 -3 mol L -1 , 6.0×10 -3 mol L -1 , 9.0×10 -3 mol L -1 , 1.2×10 -2 mol L -1 β-cyclodextrin, pH=6.80 disodium hydrogen phosphate-citric acid buffer solution.

[0122] In step 2.2, the pencil lead electrode prepared in step 1 was connected and energized according to the traditional three-electrode working system device, and polymerized in five solutions with different β-CD concentrations in step 2.1 under cyclic voltammetry (scanning voltage 0.2~ 1.0V, scan rate 50mV s -1 , enrichment time of 2 min, and number of pol...

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Abstract

A graphite electrode modified by beta-cyclodextrin comprises a graphite rod with a copper wire wound at one end and a paraffin layer on the end surface of the other end, wherein the surface of the graphite rod is provided with a beta-cyclodextrin modification layer through electro-polymerization. A preparation method of the graphite electrode modified by beta-cyclodextrin is characterized by placing the graphite electrode in a buffer solution containing the beta-cyclodextrin and powering on the graphite electrode to obtain the graphite electrode modified by beta-cyclodextrin. A method for detecting o-methoxyaniline by using the graphite electrode modified by beta-cyclodextrin is characterized by connecting the graphite electrode modified by beta-cyclodextrin according to a three-electrodeworking system, and then, placing the graphite electrode in a solution to be detected to detect peak current; and calculating the o-methoxyaniline according to relationship between the peak current and concentration of the o-methoxyaniline. The graphite electrode is modified by the beta-CD through the electropolymerization method, and preparation conditions are optimized through differential pulsevoltammetry; and the prepared graphite electrode modified by beta-cyclodextrin is applied to detect the o-methoxyaniline with simple processing and short detection cycle.

Description

technical field [0001] The invention belongs to the technical field of analysis and detection materials, and in particular relates to a graphite electrode modified by β-cyclodextrin, a preparation method of the graphite electrode, and a method for detecting o-methoxyaniline by using the prepared graphite electrode. Background technique [0002] O-methoxyaniline, also known as 2-methoxyaniline, can be used as an intermediate in the preparation of dyes and medicines. It is toxic and sensitizing, and can cause allergic reactions in the respiratory system and skin. At present, methods for detecting o-methoxyaniline include gas-mass spectrometry, dispersive solid-phase extraction purification / liquid chromatography-tandem mass spectrometry, zero current potential method, etc., but chromatography and mass spectrometry have expensive instruments and complicated pretreatment , The detection period is long, and the shortcomings of high requirements for operating skills. [0003] β-cy...

Claims

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Application Information

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IPC IPC(8): G01N27/30G01N27/48
CPCG01N27/308G01N27/48
Inventor 马明明梁娟丽刘佳
Owner XI'AN POLYTECHNIC UNIVERSITY
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