Preparation method and application of cobalt oxide/mesoporous carbon composite material electrochemical sensor

A composite material, graphitized mesoporous carbon technology, applied in the fields of material electrochemical variables, scientific instruments, analytical materials, etc., can solve the problems of low sensitivity and selectivity, expensive instruments, complicated sample preparation, etc. Simple operation and small size of the device

Inactive Publication Date: 2017-10-03
SHANGHAI OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are various methods for detecting nitrite content, such as spectrophotometry, chromatography, fluorescence photometry, chemiluminescence and capillary electrophoresis, but these methods have some disadvantages, such as expensive instruments and professional operation. Therefore, it is of great significance to find a simple, efficient and rapid method for the detection of nitrite in food to ensure food safety.

Method used

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  • Preparation method and application of cobalt oxide/mesoporous carbon composite material electrochemical sensor
  • Preparation method and application of cobalt oxide/mesoporous carbon composite material electrochemical sensor
  • Preparation method and application of cobalt oxide/mesoporous carbon composite material electrochemical sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1 Synthesis of Cobalt Oxide Particles and Graphitized Ordered Mesoporous Carbon Nanocomposites

[0033] Take 0.06g of cobalt nitrate hexahydrate and dissolve it in 2ml of pre-prepared phenolic resin solution, stir for 0.5h, and mark it as liquid A. 0.1g PS-b-PEO was dissolved in 5ml THF to make solution B. Add B dropwise to A and stir at room temperature for 2h. The resulting dark purple solution was transferred to a petri dish and evaporated at room temperature for 2 h. It was then transferred to a 50°C oven for 24 hours, and then the oven temperature was further raised to 100°C for 24 hours. Finally, a light yellow transparent composite film was obtained on a watch glass. The film was scraped off from the petri dish with a single-blade knife, placed in a tube furnace, and baked at 600°C for 3 hours under a nitrogen atmosphere, with a heating rate of 1.0°C / min. Obtain a black sample, named as Co / C-0.1-600, wherein 0.1 represents the concentration of the phe...

Embodiment 2

[0034] Example 2 Synthesis of Cobalt Oxide Particles and Graphitized Ordered Mesoporous Carbon Nanocomposites

[0035] Take 0.12g of cobalt nitrate hexahydrate and dissolve it in 2ml of pre-prepared phenolic resin solution, stir for 0.5h, and mark it as liquid A. 0.1g PS-b-PEO was dissolved in 5ml THF to make solution B. Add B dropwise to A and stir at room temperature for 2h. The resulting dark purple solution was transferred to a petri dish and evaporated at room temperature for 2 h. It was then transferred to a 50°C oven for 24 hours, and then the oven temperature was further raised to 100°C for 24 hours. Finally, a light yellow transparent composite film was obtained on a watch glass. The film was scraped off from the petri dish with a single-blade knife, placed in a tube furnace, and baked at 600°C for 3 hours under a nitrogen atmosphere, with a heating rate of 1.0°C / min. Obtain a black sample, named as Co / C-0.2-600, where 0.2 represents the concentration of the phenoli...

Embodiment 3

[0036] Example 3 Synthesis of cobalt oxide particles and graphitized ordered mesoporous carbon nanocomposites 0.35 g of cobalt nitrate hexahydrate was dissolved in 4 ml of pre-prepared phenolic resin solution and stirred for 0.5 h, marked as liquid A. 0.1g PS-b-PEO was dissolved in 5ml THF to make solution B. Add B dropwise to A and stir at room temperature for 2h. The resulting dark purple solution was transferred to a petri dish and evaporated at room temperature for 2 h. It was then transferred to a 50°C oven for 24 hours, and then the oven temperature was further raised to 100°C for 24 hours. Finally, a light yellow transparent composite film was obtained on a watch glass. The film was scraped off from the petri dish with a single-blade knife, placed in a tube furnace, and baked at 600°C for 3 hours under a nitrogen atmosphere, with a heating rate of 1.0°C / min. Obtain a black sample, named Co / C-0.3-600, wherein 0.3 represents the concentration of the phenolic resin solu...

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Abstract

The invention relates to the field of rapid detection of food safety and particularly relates to a preparation method and application of an electrochemical sensor based on a cobalt oxide/mesoporous carbon nanocomposite material and application of the electrochemical sensor in fast detection of nitrite content in a food. The preparation method of the electrochemical sensor comprises preparing a nanocomposite material carrying cobalt oxide particles and graphitized mesoporous carbon, and modifying a work electrode of the electrochemical sensor. The electrochemical sensor can detect a standard solution of nitrite, determine the linear relationship between the nitrite concentration and current, determine nitrite in the food and compare the nitrite content in the food and the linear relationship to obtain nitrite content of the food to be detected. The electrochemical sensor can determine nitrite content of a food, is easy to operate, has a fast detection rate and high detection sensitivity and provides a novel detection method for efficient and rapid detection of nitrite content in a food.

Description

technical field [0001] The invention belongs to the field of rapid detection of food safety, and specifically relates to the preparation and application of an electrochemical sensor based on cobalt oxide / mesoporous carbon nanocomposite materials, especially the rapid detection of nitrous acid in food by using the electrochemical sensor of the patent invention salt content. Background technique [0002] Nitrite is one of the active intermediates of the nitrogen cycle, which is ubiquitous in soil, water, food and various physiological systems, and is also a commonly used additive and preservative in the food industry. Especially in the meat processing industry, nitrite is often used as an additive to make meat color, enhance flavor, and have antibacterial and antiseptic effects. As a food additive allowed to be used, nitrite will not cause harm to the human body when used within a controlled and safe range. However, high doses of nitrite are very toxic. Human body intake of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30G01N27/36G01N27/48
CPCG01N27/308G01N27/36G01N27/48
Inventor 秦艳秀朱永恒刘源黄轶群宗洁
Owner SHANGHAI OCEAN UNIV
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