Mesoporous manganese oxide nano-enzyme with spherical yolk-eggshell structure, and preparation method and application thereof

A manganese oxide, nano-enzyme technology, applied in the field of nano-materials, can solve problems such as poor catalytic performance

Pending Publication Date: 2021-09-14
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] For traditional nano-enzyme materials, such as metal oxides, nano-carbon materials, etc., although the material has certain nano-enzyme catalytic properties, it is limited by the shape of the material (such as solid shape, large-scale shape, etc.) , the catalytic performance of the material is poor. Up to now, the preparation of mesoporous manganese oxide materials with egg yolk-eggshell hollow structure and the application of nanozymes have not been reported.

Method used

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  • Mesoporous manganese oxide nano-enzyme with spherical yolk-eggshell structure, and preparation method and application thereof
  • Mesoporous manganese oxide nano-enzyme with spherical yolk-eggshell structure, and preparation method and application thereof
  • Mesoporous manganese oxide nano-enzyme with spherical yolk-eggshell structure, and preparation method and application thereof

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preparation example Construction

[0042] Concrete preparation method comprises the following steps:

[0043] (1) Dissolve Pluronic F127 in alkaline ethanol / water solution, stir at room temperature until Pluronic F127 is completely dissolved, add tannic acid and formaldehyde solution, and stir for 24 hours to obtain a tannic acid oligomer precursor; Add Mn to the above solution 2+ Ion aqueous solution, after stirring for 12 hours, put the reaction system in a hydrothermal kettle at 100°C for 12 hours, and after the completion of the hydrothermal treatment, collect by centrifugation and dry to obtain manganese-tannic acid-formaldehyde polymer balls;

[0044] (2) Roast the above-mentioned manganese-tannic acid-formaldehyde polymer balls in an air atmosphere, the roasting temperature is 300°C, the roasting time is 3h, and the heating rate is 2°C / min to obtain spherical egg yolk-eggshell structure mesoporous Manganese oxide nanoenzyme material.

[0045] The oxidase-like catalytic application of the spherical egg ...

Embodiment 1

[0048] Synthesis of spherical egg yolk-eggshell structure mesoporous manganese oxide nanozyme material:

[0049] (1) Accurately weigh 0.30g of Pluronic F127 in 45.4mL of alkaline ethanol / water solution, wherein the ratio of water, ethanol and ammonia water (2.5%) is 34mL: 8mL: 3.4mL, after Pluronic F127 is completely dissolved , to obtain a clear and transparent solution. Accurately weigh 0.20g of tannic acid and 8mL of pure water to prepare a 0.025g / mL aqueous solution of tannic acid, add it to the above solution, then add 3.8mL of formaldehyde solution (3.7wt%), stir fully for 24h, and obtain a brown Opaque solution. Accurately weigh 0.06gMnSO 4 ·H 2 O in 2mL of pure water to make 0.03g / mL of MnSO 4 Add the aqueous solution to the above solution, stir for 12 hours, transfer the obtained brown solution to a 100mL hydrothermal kettle, and heat it in an oven at 100°C for 12 hours. Acid-formaldehyde polymer ball powder.

[0050] (2) Place the above-mentioned manganese-tann...

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Abstract

The invention discloses a mesoporous manganese oxide nano-enzyme with a spherical yolk-eggshell structure, and a preparation method and application thereof. Manganese-tannic acid-formaldehyde polymer spheres are roasted in an air atmosphere, so that the mesoporous manganese oxide nano-enzyme with the spherical yolk-eggshell structure is obtained. The mesoporous manganese oxide nano-enzyme is uniform in particle size distribution (70 nm), and has a high specific surface area (127 m<2>/g), a mesoporous structure (the aperture is 5.8 nm) and the yolk-eggshell structure. The mesoporous manganese oxide nano-enzyme with the spherical yolk-eggshell structure has oxidase-like activity and can catalytically oxidize 3, 3', 5, 5'-tetramethyl benzidine (TMB) to generate a color reaction, and the Michaelis constant (Km) of the material with TMB as a substrate is 97 mmol/L. The material also has oxidability, can be used for colorimetric detection of reduced biomolecules (such as glutathione, cysteine and ascorbic acid), and has good selectivity.

Description

technical field [0001] The invention belongs to the field of nanometer materials, and relates to a spherical egg yolk-eggshell structure mesoporous manganese oxide nanozyme and its preparation method and application. Background technique [0002] Nanoenzyme material is a kind of artificially synthesized nanomaterials with catalytic properties similar to natural enzymes, mainly including carbon materials, metal materials, metal oxide materials and metal organic framework materials. These nanomaterials function as natural enzymes. Although the catalytic activity of nanozyme materials is not as good as that of natural enzymes, their stability is worse than that of natural enzymes, and they are not easily affected by extreme temperature, extreme pH and organic solvents. At the same time, nano-enzyme materials are cheap and easy to store, which overcomes the problems faced by natural enzymes in the practical application process, and has broad application prospects in biomedicine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J35/08B01J35/10B01J37/08B01J37/10G01N21/31
CPCB01J23/34B01J35/0013B01J35/08B01J35/008B01J35/1019B01J35/1038B01J35/1061B01J37/10B01J37/086G01N21/31
Inventor 魏晶冯尤优秦婧成东冯冰溪
Owner XI AN JIAOTONG UNIV
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