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Hydroxypropyl /carbon nanotube decoration electrochemical sensor and preparation method and application thereof

A technology of hydroxypropyl chitosan and carbon nanotubes, applied in the direction of material electrochemical variables, can solve problems such as difficulties, limited application scope, easy agglomeration, etc., and achieve the effects of low cost, improved sensitivity, and high sensitivity

Inactive Publication Date: 2010-08-18
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the strong van der Waals force between carbon nanotubes, they are easy to agglomerate, insoluble in water and general organic solvents, and it is very difficult to directly use them in electrochemical sensors (modified electrodes).
[0005] Chitosan is a natural polysaccharide, its molecule has both hydrophilic groups and hydrophobic groups and -NH with coordination ability 2 , -OH, so it can not only adsorb metal ions but also non-metallic substances, such as polychlorinated biphenyls, proteins, nucleic acids, halogens, phthalic acid, etc.; free amino groups in chitosan can combine with H+ from the solution to become Positively charged chitosan polyelectrolyte is dissolved, but chitosan itself is insoluble in water and general organic solvents, which greatly limits its application range

Method used

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  • Hydroxypropyl /carbon nanotube decoration electrochemical sensor and preparation method and application thereof
  • Hydroxypropyl /carbon nanotube decoration electrochemical sensor and preparation method and application thereof
  • Hydroxypropyl /carbon nanotube decoration electrochemical sensor and preparation method and application thereof

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Embodiment 1

[0040] The electrochemical sensor of the present invention comprises glassy carbon electrodes, such as figure 1 The glassy carbon electrode shown includes a glassy carbon substrate 2 , an electrode lead 3 electrically connected to the glassy carbon substrate 2 and an insulating layer 4 , and the surface of the glassy carbon substrate 2 is coated with a responsive film 1 .

[0041] The preparation method of the electrochemical sensor is as follows:

[0042] (1) 5 g of multi-walled carbon nanotubes were refluxed and oxidized in concentrated nitric acid for 5 hours, then washed with twice distilled water to neutrality and dried to obtain multi-walled carbon nanotubes with functional groups such as carboxyl and hydroxyl groups at the end groups;

[0043] (2) Preparation of hydroxypropyl chitosan: Weigh 1 g of sodium hydroxide solid, put it in a beaker, add 50 ml of distilled water to dissolve it, and add isopropanol to make it fully dispersed. Put into there-necked flask, add 4g...

Embodiment 2

[0048] The electrochemical sensor of the present invention comprises glassy carbon electrodes, such as figure 1 The glassy carbon electrode shown includes a glassy carbon substrate 2 , an electrode lead 3 electrically connected to the glassy carbon substrate 2 and an insulating layer 4 , and the surface of the glassy carbon substrate 2 is coated with a responsive film 1 .

[0049] The preparation method of the electrochemical sensor is as follows:

[0050] (1) 5 g of multi-walled carbon nanotubes were refluxed and oxidized in concentrated nitric acid for 5 hours, then washed with twice distilled water to neutrality and dried to obtain multi-walled carbon nanotubes with functional groups such as carboxyl and hydroxyl groups at the end groups;

[0051] (2) preparation of hydroxypropyl chitosan: except that the addition of propylene oxide is 15ml, other is as embodiment 1;

[0052] (3) 5 mg of the above-mentioned multi-walled carbon nanotubes with multifunctional groups and 0.1...

Embodiment 3

[0056] The electrochemical sensor of the present invention comprises glassy carbon electrodes, such as figure 1 The glassy carbon electrode shown includes a glassy carbon substrate 2 , an electrode lead 3 electrically connected to the glassy carbon substrate 2 and an insulating layer 4 , and the surface of the glassy carbon substrate 2 is coated with a responsive film 1 .

[0057] The preparation method of the electrochemical sensor is as follows:

[0058] (1) 5 g of multi-walled carbon nanotubes were refluxed and oxidized in concentrated nitric acid for 5 hours, then washed with twice distilled water to neutrality and dried to obtain multi-walled carbon nanotubes with functional groups such as carboxyl and hydroxyl groups at the end groups;

[0059] (2) preparation of hydroxypropyl chitosan: as embodiment 1;

[0060] (3) 2 mg of the above-mentioned multi-walled carbon nanotubes with multifunctional groups and 0.07 g hydroxypropyl chitosan are dissolved in 10 ml of acetic ac...

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Abstract

The invention discloses a hydroxypropyl / carbon nanotube decoration electrochemical sensor which mainly comprises a glassy carbon electrode, and the surface of the glassy carbon electrode is coated with a response film; the preparation method of the response film is as follows: a carbon nanotube and hydroxypropyl are added into acetic acid solution, and then homogeneous and light black hydroxypropyl / carbon nanotube compound dispersion liquid is prepared through an ultrasonic dispersion method; and the dispersion liquid is coated on the glassy carbon electrode, evaporated at room temperature to prepare the response film. The invention also discloses a preparation method of an electrochemical sensor and application of the electrochemical sensor in detecting zinc ions. The electrochemical sensor of the invention has simple and easy manufacturing method and low cost, and has high sensitivity in determining the zinc ions.

Description

technical field [0001] The invention relates to a hydroxypropyl chitosan / carbon nanotube modified electrochemical sensor, a preparation method and application thereof. Background technique [0002] Zinc is an essential trace element for the human body. It is a component or coenzyme of the six major coenzymes and 200 metalloenzymes in the human body, and plays a broad role in the metabolism of the whole body. When zinc is lacking, it will cause loss of appetite, growth retardation, pica and dermatitis, etc.; in addition, when the zinc content in the water is 2mg / L, the water begins to have a peculiar smell, and when the content is 5mg / L, the water becomes milky; Zinc-containing wastewater will also have toxic effects on aquatic organisms after being discharged into natural water bodies, so the determination of trace zinc is of great significance in both life sciences and environmental sciences. [0003] At present, polarographic adsorption method, spectrophotometric method, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/26G01N27/30G01N27/48
Inventor 庞雪辉魏琴张洁隋卫平谭福能解建东
Owner UNIV OF JINAN
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