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Electrochemical sensor for detecting bisphenol A, preparation method and application thereof

A sensor and electrochemical technology, applied in the direction of material electrochemical variables, nanotechnology for sensing, nanotechnology, etc., can solve the problems of poor selectivity, stability, and low sensitivity, and achieve good stability and expand electrocatalysis The effect of high area and detection sensitivity

Inactive Publication Date: 2014-03-19
CAPITAL NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned electrochemical sensors still have disadvantages such as poor selectivity, poor stability, and low sensitivity, so improving the above-mentioned performance is the key to the development of new electrochemical sensors.

Method used

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  • Electrochemical sensor for detecting bisphenol A, preparation method and application thereof
  • Electrochemical sensor for detecting bisphenol A, preparation method and application thereof
  • Electrochemical sensor for detecting bisphenol A, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The first step, glassy carbon electrode pretreatment:

[0037] (a) The glassy carbon electrode is sequentially polished to a mirror surface with 1.0 μm, 0.3 μm and 0.05 μm alumina powder on a polishing cloth;

[0038] (b) ultrasonically clean the glassy carbon electrode twice in secondary water for 2-5 minutes each time, and then dry it;

[0039] (c) Put the glassy carbon electrode at 0.1mol·L -1 In the potassium ferricyanide solution, a cyclic voltammetry scan was performed between -0.4 and +0.7 V until a typical cyclic voltammetry pattern was obtained, resulting in a clean glassy carbon electrode.

[0040] In the second step, the electrode surface is modified with aminated carbon nanotubes:

[0041] Disperse the aminated carbon nanotubes in DMF and disperse them ultrasonically to obtain a DMF dispersion of the aminated carbon nanotubes with a concentration of 1 g. L -1 ;

[0042] Add 10 μL of the dispersion liquid dropwise to the clean glassy carbon electrode pre...

Embodiment 2

[0072] According to the steps of Example 1, only the amount of the dispersion used in the second step was replaced from 10 μL to 5 μL;

[0073] The concentration of glutamic acid used in the third step was replaced by 0.1mol. L -1 , the number of scanning circles is replaced by 6 circles to 3 circles, and the electrochemical sensor provided by the present invention is obtained.

[0074] The electrochemical sensor includes a glassy carbon electrode; on the surface of the glassy carbon electrode, there are aminated multi-walled carbon nanotubes and a network composed of polyglutamic acid (n is 1000-15000) shown in formula I in sequence from inside to outside Polyglutamic acid film; the thickness of the aminated carbon nanotube is 15-150nm; the outer diameter is 8-15nm; the inner diameter is 2-4nm; the length is 50μm; the thickness of the polyglutamic acid film is 5nm.

[0075] Utilize the electrochemical sensor obtained in this embodiment to carry out the detection of bispheno...

Embodiment 3

[0082] According to the step of Example 1, only the concentration of the DMF dispersion in the second step is replaced by 0.7g. L -1 ;

[0083] In the third step, the concentration of the phosphate buffer solution of glutamic acid is replaced by 0.015mol. L -1 , and the number of scanning circles was replaced by 10 circles to obtain the electrochemical sensor provided by the present invention.

[0084] The electrochemical sensor includes a glassy carbon electrode; on the surface of the glassy carbon electrode, there are aminated multi-walled carbon nanotubes and a network composed of polyglutamic acid (n is 1000-15000) shown in formula I in sequence from inside to outside Polyglutamic acid film; the thickness of the aminated carbon nanotube is 15-150nm; the outer diameter is 8-15nm; the inner diameter is 2-4nm; the length is 50μm; the thickness of the polyglutamic acid film is 5nm.

[0085] Utilize the electrochemical sensor obtained in this embodiment to carry out the det...

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Abstract

The invention discloses an electrochemical sensor for detecting bisphenol A, a preparation method and application thereof. The electrochemical sensor includes a glassy carbon electrode, the surface of which is provided with aminated carbon nanotubes and a polyglutamic acid membrane from the inside out in order. The polyglutamic acid membrane is a membrane composed of the polyglutamic acid as shown in formula I. According to the invention, the aminated carbon nanotubes are dispersed in an organic solvent, the dispersed solution is added to the glassy carbon electrode surface in a dropwise manner, and the solvent is evaporated, thus obtaining the aminated carbon nanotube modified glassy carbon electrode. The aminated carbon nanotube modified glassy carbon electrode is subjected to polymerization in a glutamic acid solution so as to obtain the electrochemical sensor constructed by the glassy carbon electrode modified by a polyglutamic acid film and aminated carbon nanotube composite nanomaterial. The electrochemical sensor for detecting bisphenol A has the advantages of excellent sensitivity and stability, a minimum detection limit of 0.02 micromolL<-1>, and can be used for actual sample bisphenol A detection.

Description

technical field [0001] The invention relates to an electrochemical sensor for detecting bisphenol A, a preparation method and application thereof. Background technique [0002] As an important chemical raw material, bisphenol A (BPA) is widely used in the production of epoxy resin and polycarbonate plastics. At present, traces of bisphenol A have been found in baby bottles, plastic beverage bottles, and metal-packaged foods. The important reason why bisphenol A has attracted widespread attention is that it exhibits estrogenic properties in vivo and / or in vitro, and becomes an endocrine disruptor. Even trace amounts can cause various diseases, such as affecting the development of male and female reproductive organs, causing Reproductive dysfunction, resulting in decreased sperm quality and birth defects (Environmental Health Perspective2007, 115: 80). The European Union believes that baby bottles containing bisphenol A can induce precocious puberty. From March 2, 2011, baby...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30G01N27/48B82Y15/00
Inventor 林雨青刘康玉刘晨昱李博尹璐
Owner CAPITAL NORMAL UNIVERSITY
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