Molecularly imprinted polymer/carbon nano-tube/basal electrode modified electrode and application thereof

A molecular imprinting and substrate electrode technology, which is used in the analysis of materials, electrochemical variables of materials, and material analysis by electromagnetic means.

Inactive Publication Date: 2010-06-16
EAST CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above method for detecting nitrobenzene compounds needs to be further improved in terms of selectivity and sensitivity

Method used

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  • Molecularly imprinted polymer/carbon nano-tube/basal electrode modified electrode and application thereof
  • Molecularly imprinted polymer/carbon nano-tube/basal electrode modified electrode and application thereof
  • Molecularly imprinted polymer/carbon nano-tube/basal electrode modified electrode and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0055] The present invention provides an embodiment of a specific preparation method of a molecularly imprinted polymer film, comprising the following steps:

[0056] (1) Using the compound to be detected as a template, using acrylamide as a functional monomer, using ethylene glycol dimethacrylate (EGDMA) as a crosslinking agent, and using azobisisobutyronitrile as an initiator, wherein the template molecule , The ratio between the functional monomer and the crosslinking agent is 1:4:16-1:5:25. If the amount of cross-linking agent is too high, the cross-linking degree increases, which can effectively maintain the stability of the imprinted hole space structure and ensure the specific recognition of template molecules; however, too high cross-linking is not conducive to the elution of template molecules, and also After the template molecule is eluted, the imprinted hole has poor accessibility, which is not conducive to the recombination of the template molecule.

[0057] (2) A...

Embodiment 1

[0111] The preparation of embodiment 1 electrode of the present invention

[0112] 1. Pretreatment of glassy carbon electrodes

[0113] Grinding and polishing the surface of the glassy carbon electrode, followed by 1mol / L NaOH solution, 1mol / L HNO 3 solution, ethanol and double distilled water sonication. Let dry at room temperature.

[0114] 2. Carbon nanotube layer modification

[0115] Use a micro-syringe to draw 2 μL of 1 mg / mL carbon nanotube solution (carbon nanotubes are purchased from Shenzhen Nanoport Co., Ltd., multi-walled carbon nanotubes, 100 μm; the solvent of the solution is N,N-dimethylformamide), Drop-coated on the surface of the glassy carbon electrode and let it dry for 10 minutes. A carbon nanotube film was formed on the surface of the glassy carbon electrode. Control the thickness to 100-120 μm.

[0116] 3. Preparation of electrolyte solution

[0117] 2.355g KH 2 PO 4 and 3.925gNa 2 HPO 4 Dissolve in appropriate amount of water, add distilled wa...

Embodiment 2～5

[0122] Embodiment 2~5 preparation of the electrode of the present invention

[0123] The electrode is prepared by a method similar to that of Example 1, the difference is shown in Table 1 below

[0124] Table 1: Preparation conditions of Examples 2 to 5

[0125]

[0126] Note: the abbreviations in Examples 1 to 5 are indicated as follows: 2,4,6-trinitrotoluene (TNT), 1,3,5-trinitrobenzene (TNB), 2,4-dinitrotoluene ( DNT), 1.3-dinitrobenzene (DNB), or combinations thereof.

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Abstract

The invention discloses a modified electrode, which is used for detecting nitrobenzene compounds. The modified electrode comprises a basal electrode, a carbon nano-tube (CNTs) film, and a molecularly imprinted polymer (MIP) membrane, wherein the carbon nano-tube (CNTs) film is coated on the surface of the basal electrode, and the molecularly imprinted polymer (MIP) membrane is coated on the surface of the carbon nano-tube film. The invention also discloses a method for preparing the electrode, an electrochemical system taking the electrode as a working electrode, and a method for detecting nitrocompounds in a sample by the electrochemical system. The electrode has the advantages of quick response speed, good stability and high sensitivity, and can selectively detect the nitrocompounds; and environment-friendly materials adopted by the electrode cannot cause the pollution.

Description

technical field [0001] The invention belongs to the field of analytical chemistry and detection of nitro explosives, more specifically, the invention relates to the preparation of a molecularly imprinted polymer / carbon nanotube / substrate electrode modified electrode, and the rapid determination of the selectivity of the electrode by using the electrode method for the determination of nitro compounds in samples). Background technique [0002] Since the September 11 incident, various terrorist incidents have emerged in an endless stream around the world, especially the terrorist attacks of the international terrorist forces with the "Al Qaeda" organization as the core. Far from being compared with traditional terrorist activities, it has caused great harm to international security. In various terrorist activities, explosion is one of the most commonly used methods by terrorists. At present, explosives are mainly nitrobenzene compounds, including 2,4,6-trinitrotoluene (TNT), ...

Claims

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Application Information

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IPC IPC(8): G01N27/30G01N27/36G01N27/333
Inventor 施国跃刘烨曲云鹤周天舒孙倩杨勤燕梁莹金利通
Owner EAST CHINA NORMAL UNIVERSITY
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