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Preparation method and application of carbon nanotube/ titanium dioxide/carboxymethyl chitosan nanometer composite electrochemical sensing material

A technology of carboxymethyl chitosan and nano-titanium dioxide, which is applied in the field of nano-composite materials and functional materials, can solve the problems of poor electrochemical sensing, poor dispersion, and easy aggregation, and achieve the effect of optimizing electrochemical performance

Inactive Publication Date: 2016-07-27
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a kind of preparation method and application of carbon nanotube / titanium dioxide / carboxymethyl chitosan nanocomposite electrochemical sensing material, improve carbon nanotube in the nanocomposite material by the method of sol-gel reaction It is easy to agglomerate, poor dispersion, and thus poor electrochemical sensing; by changing the mass fraction of carbon nanotubes and titanium dioxide in the composite material, the electrochemical sensing material with the best characteristics is obtained, and finally the detection of dichloride in food is obtained. Electrochemical sensor material for insect residue detection

Method used

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  • Preparation method and application of carbon nanotube/ titanium dioxide/carboxymethyl chitosan nanometer composite electrochemical sensing material
  • Preparation method and application of carbon nanotube/ titanium dioxide/carboxymethyl chitosan nanometer composite electrochemical sensing material

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Embodiment 1

[0023] A preparation method of carbon nanotube / titanium dioxide / carboxymethyl chitosan nanocomposite electrochemical sensing material is characterized in that it is completed by the following multi-step reactions, and the schematic diagram of the preparation process is as follows figure 1 shown. Specific steps are as follows:

[0024]Step (1): ultrasonically disperse a certain amount of dried multi-walled carbon nanotubes in absolute ethanol for 1-2 hours to form a liquid A, dissolve a certain amount of tetrabutyl titanate in absolute ethanol to form a liquid B, Slowly add solution B to solution A. During the process of dropping, add a certain amount of glacial acetic acid solution, 95% ethanol and 0.1M nitric acid solution in sequence, add ammonia water dropwise to adjust the pH to about 7, and keep stirring for 6 hours. , forming uniform nanometer MWCNTsTiO 2 Mix the solution and let it stand for 24 hours. After the solvent evaporates, the required gel is obtained; collect...

Embodiment 2

[0034] On the basis of Example 1, the ratio of MWCNTs and nano titanium dioxide used in the experimental step (1) b was adjusted to 50%:50%;

[0035] Step (2): The MWCNTsTiO prepared in step (1) 2 0.04g of the nanocomposite was dispersed into an aqueous solution of 0.16g carboxymethyl chitosan (CMCS); that is, the MWCNTsTiO in step (2) 2 And the ratio of CMCS is adjusted to 20%: 80%, other steps are identical with embodiment 1, obtain MWCNTsTiO 2 / CMCS nanocomposite electrochemical sensing materials.

Embodiment 3

[0037] On the basis of Example 1, the ratio of MWCNTs and nano-titanium dioxide used in the experimental step (1) b was adjusted to 33%: 67%; in step (2), MWCNTsTiO 2 The ratio adjustment with CMCS is 15%: 85%, and other steps are identical with embodiment 1, obtain MWCNTsTiO 2 / CMCS nanocomposite electrochemical sensing materials. see test results Figure 5 Curve a in (A).

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Abstract

The invention discloses a preparation method and application of a carbon nanotube / titanium dioxide / carboxymethyl chitosan nanometer composite electrochemical sensing material. In the method, the electrochemical performance of multi-walled carbon nanotubes (MWCNTs), the electro-catalytic performance of nanometer titanium dioxide (TiO2) and film-forming capacity of carboxymethyl chitosan (CMCS) are combined, and the MWCNTs@TiO2 / CMCS nanometer composite material is prepared through an in-situ sol / gel reaction and a solution blending method. An MWCNTs@TiO2 nanometer composite is prepared from MWCNTs and tetrabutyl titanate first, then the prepared nanometer composite and CMCS are compounded and assembled into a thin film according to a certain proportion, the thin film is used as a sensing element for detecting the residual amount of pesticide in food, and finally the electrochemical sensor material capable of detecting the residual amount of dipterex in food is obtained by adjusting and regulating the proportion of carbon nanotubes and titanium dioxide in the conductive composite material.

Description

technical field [0001] The invention belongs to the technical field of nanocomposite materials and functional materials, and specifically relates to a method for preparing MWCNTsTiO by in-situ sol-gel method 2 Methods and applications of CMCS nanocomposite electrochemical sensing materials. Background technique [0002] Trichlorfon is an organophosphorus pesticide widely used in agricultural production. It can inhibit the activity of acetylcholinesterase, leading to a large accumulation of the neurotransmitter acetylcholine in the body, thereby causing a series of neurological reactions, such as nausea, headache, weakness , chest tightness and other poisoning symptoms, serious can lead to death. After using trichlorfon pesticide, you cannot wash your face and hands with alkaline detergents such as soap, otherwise it will cause poisoning and even death. This is because trichlorfon can become highly volatile dichlorvos in alkaline solution, and the toxicity of dichlorvos It ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/48G01N27/30
CPCG01N27/30G01N27/48
Inventor 罗延龄魏雪鹏杨丽华徐峰
Owner SHAANXI NORMAL UNIV
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