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Application of hydroxypropyl chitosan/carbon nanotube modified electrochemical sensor

A technology of hydroxypropyl chitosan and carbon nanotubes, applied in the direction of material electrochemical variables, scientific instruments, instruments, etc., can solve the problems of limited application scope, easy agglomeration, difficulty, etc., and achieves improved sensitivity, high sensitivity, and cost. low cost effect

Inactive Publication Date: 2012-05-30
INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 bind H from the solution + It becomes a positively charged chitosan polyelectrolyte and dissolves, but chitosan itself is insoluble in water and general organic solvents, which greatly limits its application range

Method used

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  • Application of hydroxypropyl chitosan/carbon nanotube modified electrochemical sensor
  • Application of hydroxypropyl chitosan/carbon nanotube modified electrochemical sensor
  • Application of hydroxypropyl chitosan/carbon nanotube modified electrochemical sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Such as figure 1 As shown, the working electrode of the electrochemical sensor consists of 1 response film, 2 glassy carbon substrate, 3 electrode leads and 4 insulating layers.

[0045] The preparation method of the working electrode of the electrochemical sensor is as follows:

[0046] 1) Place 5 g of multi-walled carbon nanotubes in 20% nitric acid for reflux oxidation for 5 hours, then wash with double distilled water until neutral and dry to obtain multi-walled carbon nanotubes with functional groups such as carboxyl and hydroxyl groups at the end groups ;

[0047] 2) Preparation of hydroxypropyl chitosan: 1 g of sodium hydroxide solid was weighed, placed in a beaker, 50 ml of distilled water was added to dissolve it, and 25 g of isopropanol was added to fully disperse it. Put into there-necked flask, add 4g chitosan while stirring. After alkalization for 9 hours, 40ml of propylene oxide was added, and the mixture was heated under reflux at 45°C for 14 hours. ...

Embodiment 2

[0052] The working electrode of the electrochemical sensor consists of 1 response membrane, 2 glassy carbon substrate, 3 electrode leads and 4 insulating layers.

[0053] The preparation method of the working electrode of the electrochemical sensor is as follows:

[0054] 1) Place 5 g of multi-walled carbon nanotubes in 30% nitric acid for reflux oxidation for 6 hours, then wash with twice distilled water to neutrality and dry to obtain multi-walled carbon nanotubes with functional groups such as carboxyl and hydroxyl groups at the end groups ;

[0055] 2) Preparation of hydroxypropyl chitosan: 1 g of sodium hydroxide solid was weighed, placed in a beaker, 20 ml of distilled water was added to dissolve it, and 30 g of isopropanol was added to fully disperse it. Put into there-necked flask, add 3g chitosan while stirring. After alkalization for 10 h, 20 ml of propylene oxide was added, and the reaction was heated under reflux at 45° C. for 13 hours. After the product can be ...

Embodiment 3

[0059] The working electrode of the electrochemical sensor consists of 1 response membrane, 2 glassy carbon substrate, 3 electrode leads and 4 insulating layers.

[0060] The preparation method of the working electrode of the electrochemical sensor is as follows:

[0061] 1) Place 5 g of multi-walled carbon nanotubes in 40% nitric acid for reflux oxidation for 8 hours, then wash with double distilled water to neutrality and dry to obtain multi-walled carbon nanotubes with functional groups such as carboxyl and hydroxyl groups at the end groups ;

[0062] 2) Preparation of hydroxypropyl chitosan: 1 g of sodium hydroxide solid was weighed, placed in a beaker, 40 ml of distilled water was added to dissolve it, and 35 g of isopropanol was added to fully disperse it. Put into there-necked flask, add 1g chitosan while stirring. After alkalization for 9 hours, 10 ml of propylene oxide was added, and the mixture was heated under reflux at 45°C for 14 hours. After the product can be...

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Abstract

The invention relates to a sensor and an application thereof, and concretely relates to a hydroxypropyl chitosan / carbon nanotube modified electrochemical sensor and an application thereof. The electrochemical sensor which is obtained by treating a glassy carbon electrode as a working electrode and coating the surface of the glassy carbon electrode with a hydroxypropyl chitosan / carbon nanotube response film can be used to detect the content of Pb ions in wastewater. The working electrode of the electrochemical sensor of the present invention has the advantages of simple and easily implemented manufacturing method, low cost, and high sensitivity when the working electrode is used to detect the Pb ions.

Description

technical field [0001] The invention relates to a sensor and its application, more specifically to a hydroxypropyl chitosan / carbon nanotube modified electrochemical sensor and its application. Background technique [0002] Lead is a toxic metal that can accumulate in human and animal tissues. Among heavy metal pollution, lead is particularly prominent and highly toxic. Lead and its compounds are non-degradable pollutants that enter the human body through the enrichment of the food chain. , The impact of lead on the human body is systemic and multi-system, among which the nervous system, blood system and hematopoietic system are most harmful. It can cause anemia, nervous dysfunction and kidney damage, and often cause irreversible brain damage to children. my country's health standards stipulate that the lead content in surface water and drinking water should not exceed 0.05 mg / L. Therefore, the detection of lead content in wastewater is of great significance. [0003] At pre...

Claims

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Application Information

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IPC IPC(8): G01N27/413G01N27/30
Inventor 庞雪辉张洁魏琴隋卫平谭福能冉祥滨解建东侯保荣
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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