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a mno 2 /Graphene nanocomposite material and its prepared electrode

A nanocomposite material and graphene composite technology, which is applied in the fields of material preparation and electrochemical analysis, can solve the problem of high detection limit of caffeic acid detection electrode, and achieve the effects of good storage stability, low detection limit and high sensitivity

Active Publication Date: 2017-08-25
HENGYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The primary technical problem to be solved by the present invention is, in order to overcome the problem of high detection limit of the caffeic acid detection electrode in the prior art, to provide a kind of MnO used to prepare the caffeic acid detection electrode 2 / Graphene Nanocomposite

Method used

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  • a mno <sub>2</sub> /Graphene nanocomposite material and its prepared electrode
  • a mno <sub>2</sub> /Graphene nanocomposite material and its prepared electrode
  • a mno <sub>2</sub> /Graphene nanocomposite material and its prepared electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Example 1 MnO 2 / Preparation of graphene nanocomposites

[0056] A kind of MnO 2 / The preparation method of graphene nanocomposite material, comprises the steps:

[0057] S11. Combining mesoporous carbon with KMnO 4 Mix, add deionized water and stir for 12 hours to obtain a suspension;

[0058] S12. Add concentrated sulfuric acid to the suspension, and continue to stir for 1.2h to obtain a mixture;

[0059] S13. Heating the mixture to 85°C and maintaining a constant temperature for 1.5h to obtain a reaction solution;

[0060] S14. Dilute the reaction solution 5 times with deionized water, cool to room temperature, and precipitate;

[0061] S15. Collect the resulting precipitate with a filter membrane with a pore size of 0.25 mm, wash and dry to obtain the MnO 2 / graphene nanocomposites;

[0062] Mesoporous carbon, KMnO described in step S11 4 The dosage ratio of mixing and deionized water is 1g: 12g: 450mL;

[0063] The concentrated sulfuric acid described in...

Embodiment 2

[0066] Example 2 MnO 2 / Preparation of graphene nanocomposites

[0067] A kind of MnO 2 / The preparation method of graphene nanocomposite material, comprises the steps:

[0068] S11. Combining mesoporous carbon with KMnO 4 Mix, add deionized water and stir for 8 hours to obtain a suspension;

[0069] S12. Add concentrated sulfuric acid to the suspension, and continue to stir for 2h to obtain a mixture;

[0070] S13. Heating the mixture to 90° C. and maintaining the constant temperature for 2 hours to obtain a reaction solution;

[0071] S14. Dilute the reaction solution 6 times with deionized water, cool to room temperature, and precipitate;

[0072] S15. Collect the resulting precipitate with a filter membrane with a pore size of 0.20 mm, wash and dry to obtain the MnO 2 / graphene nanocomposites;

[0073] Mesoporous carbon, KMnO described in step S11 4 The dosage ratio of deionized water is 1g: 10g: 600mL;

[0074] The concentrated sulfuric acid described in step S...

Embodiment 3

[0076] Example 3 MnO 2 / Preparation of graphene nanocomposites

[0077] A kind of MnO 2 / The preparation method of graphene nanocomposite material, comprises the steps:

[0078] S11. Combining mesoporous carbon with KMnO 4 Mix, add deionized water and stir for 24 hours to obtain a suspension;

[0079] S12. Add concentrated sulfuric acid to the suspension, and continue to stir for 0.5h to obtain a mixture;

[0080] S13. Heating the mixture to 75°C and maintaining a constant temperature for 0.5h to obtain a reaction solution;

[0081] S14. Dilute the reaction solution 3 times with deionized water, cool to room temperature, and precipitate;

[0082] S15. Collect the resulting precipitate with a filter membrane with a pore size of 0.30 mm, wash and dry to obtain the MnO 2 / graphene nanocomposites;

[0083] Mesoporous carbon, KMnO described in step S11 4 The dosage ratio of mixing and deionized water is 1g: 8g: 400mL;

[0084] The concentrated sulfuric acid described in ...

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Abstract

The invention relates to the technical field of material preparation and electrochemical analysis, and specifically discloses a MnO2 / graphene nanometer composite material and an electrode prepared from the MnO2 / graphene nanometer composite material. The preparation method comprises: S11, mixing mesoporous carbon and KMnO4, adding deionized water, and stirring for 8-24 h to obtain a suspension; S12, adding concentrated sulfuric acid to the suspension, and continuously stirring for 0.5-3 h to obtain a mixture; S13, heating the mixture to a temperature of 70-90 DEG C, and maintaining the constant temperature for 0.5-3 h to obtain a reaction liquid; S14, diluting the reaction liquid by 3-8 times by using deionized water, cooling to a room temperature, and generating precipitate; and S15, collecting the generated precipitate by using a filtration membrane with a pore size of 0.20-0.5 mm, washing, and drying to obtain the MnO2 / graphene nanometer composite material. According to the present invention, the electrode prepared from the MnO2 / graphene nanometer composite material can be used for quantitatively detecting the caffeic acid content in beverages, food or medicine, and has advantages of low detection limit, high sensitivity, good stability, strong anti-interference and the like.

Description

technical field [0001] The invention relates to the technical field of material preparation and electrochemical analysis, in particular to a MnO 2 / Graphene nanocomposite materials and electrodes prepared therefrom. Background technique [0002] Nanomaterials have excellent catalytic effects, and the modified electrodes prepared by using them are widely used in the analysis and detection of food safety, biopharmaceuticals, clinical medicine, environmental monitoring and other fields; this is because the nanomaterial modified electrodes not only have high sensitivity and low detection limit , and also has the advantages of simple preparation, convenient operation, short time consumption and low cost, and can realize fast and economical analysis and detection. [0003] Caffeic acid, also known as 3,4-dihydroxycinnamic acid, is an organic acid and phenolic compound. Caffeic acid widely exists in natural herbal plants. As an important pharmaceutical intermediate, it has signif...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G45/02G01N27/30
CPCC01G45/02C01P2004/03C01P2004/80C01P2006/40G01N27/308
Inventor 李俊华童超英刘梦琴张复兴许志锋
Owner HENGYANG NORMAL UNIV
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