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A composite modified electrode and its application in simultaneous determination of 2,7-naphthalenediol and bisphenol-a in water

A technology for modifying electrodes and complexes, applied in the fields of material preparation and electrochemical analysis, can solve problems such as inability to measure at the same time, and achieve the effects of low detection limit, strong anti-interference, and high sensitivity

Active Publication Date: 2022-08-02
HUNAN POLYTECHNIC OF ENVIRONMENT & BIOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The primary technical problem to be solved by the present invention is to provide a β-cyclodextrin / graphene composite modified electrode in order to overcome the inability to simultaneously measure the content of 2,7-naphthalenediol and bisphenol A in water in the prior art ; The β-cyclodextrin / graphene composite modified electrode can simultaneously determine the content of 2,7-naphthalenediol and bisphenol A in water

Method used

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  • A composite modified electrode and its application in simultaneous determination of 2,7-naphthalenediol and bisphenol-a in water
  • A composite modified electrode and its application in simultaneous determination of 2,7-naphthalenediol and bisphenol-a in water
  • A composite modified electrode and its application in simultaneous determination of 2,7-naphthalenediol and bisphenol-a in water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1 Preparation of β-cyclodextrin / graphene composite modified electrode

[0039] S1. Preparation of β-cyclodextrin / graphene composite (CD-GN);

[0040] S2. ultrasonically dispersing the β-cyclodextrin / graphene complex in DMF to make a dispersion of 1 mg / mL;

[0041] S3. Take 5 μL of dispersion and drop it on the surface of the pretreated glassy carbon electrode (3.0mm in diameter) to make it evenly distributed, and then dry it under an infrared lamp to obtain a β-cyclodextrin / graphene composite modified electrode (CD-GN / GCE);

[0042] The β-cyclodextrin / graphene composite described in step S1 is prepared by the following method:

[0043] S11. prepare a β-cyclodextrin dispersion (dispersed with water) with a concentration of 1.0 mmol / L and a graphene DMF dispersion with a concentration of 0.5 mg / mL;

[0044] S12. Add the β-cyclodextrin dispersion liquid dropwise to the graphene DMF dispersion liquid (the volume ratio of the β-cyclodextrin solution and the graphe...

Embodiment 2

[0057] Example 2 Detection performance of β-cyclodextrin / graphene composite modified electrode

[0058] Using the β-cyclodextrin / graphene composite modified electrode prepared in Example 1 or the β-cyclodextrin modified electrode or graphene modified electrode or glassy carbon electrode prepared in Comparative Examples 1 and 2 as the working electrode, A three-electrode system was formed with a platinum sheet auxiliary electrode and a saturated calomel reference electrode, and was connected to a CHI660D electrochemical workstation (Shanghai Chenhua Instrument Co., Ltd.) for electrochemical performance detection.

[0059] The complex-modified electrode involved in the above was scanned for 20 segments in a potential range of -1.0-1.0V in a potential range of -1.0-1.0V with a scan speed of 0.1V / s to activate the electrode; after each measurement, it was soaked in ethanol solution for 60s. Rinse to remove the phenolic oxide film deposited on the modified electrode surface.

[00...

Embodiment 3

[0070] Embodiment 3 Determination method of 2,7-naphthalenediol and bisphenol A content in Xiangjiang water sample

[0071] (1) The β-cyclodextrin / graphene composite modified electrode prepared in Example 1 is used as the working electrode, the platinum electrode is used as the counter electrode, and the saturated calomel electrode is used as the reference electrode to form a three-electrode system, and the three-electrode system is connected. to the electrochemical workstation;

[0072] (2) The oxidation peak current values ​​of 2,7-naphthalenediol and bisphenol A in the Xiangjiang water sample were measured by differential pulse voltammetry, and the 2,7-naphthalenediol was converted according to the linear equation (described in Example 2) The concentration of phenol and bisphenol A, and then the content of 2,7-naphthalenediol and bisphenol A in the sample is obtained; the detection conditions of the differential pulse voltammetry are: PBS with pH=5.0; the enrichment potenti...

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Abstract

The invention relates to the technical fields of material preparation and electrochemical analysis, and specifically discloses a composite modified electrode and its application in simultaneous determination of the contents of 2,7-naphthalenediol and bisphenol A in water. The β-cyclodextrin / graphene composite modified electrode is prepared by the following methods: S1. preparing the β-cyclodextrin / graphene composite; S2. compounding the β-cyclodextrin / graphene The substance is ultrasonically dispersed in an organic solvent to prepare a dispersion; S3. The dispersion is added dropwise to the surface of the glassy carbon electrode, and after drying, a β-cyclodextrin / graphene composite modified electrode is obtained. The composite modified electrode can simultaneously measure the content of 2,7-naphthalenediol and bisphenol A in water, and has the advantages of low detection limit, high sensitivity and strong anti-interference.

Description

technical field [0001] The invention relates to the technical field of material preparation and electrochemical analysis, in particular to a composite modified electrode and its application in simultaneous determination of the content of 2,7-naphthalenediol and bisphenol A in water. Background technique [0002] 2,7-Naphthalenediol (NAP) is an important monomer in the fields of medicine, dyes, fibers, etc. It is strongly irritating and corrosive to skin, eyes and respiratory tract. Bisphenol A (PBA) is an estrogen-like hormone that can disrupt endocrine. It can quickly and intactly enter the cell membrane, affecting the level and metabolism of human hormones, resulting in disorders of the endocrine system. The high toxicity and potential mutagenicity of these two phenols will seriously threaten human health. 2,7-Naphthalenediol and bisphenol A can infiltrate into the surface water layer from industrial waste and filtrate from landfills to pollute water sources. The method ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/30G01N27/48
CPCG01N27/308G01N27/48
Inventor 贺灵芝李俊华曹建平陈爱军蒋云凯
Owner HUNAN POLYTECHNIC OF ENVIRONMENT & BIOLOGY
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