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A method for regulating the catalytic activity of manganese dioxide nanozyme

A technology of catalytic activity and manganese dioxide, which is applied in chemical instruments and methods, catalyst activation/preparation, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of no reported catalytic activity methods, and the method is simple , mild and environmentally friendly conditions, and short preparation process

Active Publication Date: 2022-04-05
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore by adjusting the MnO 2 The ratio of each valence state of the surface Mn element can adjust its catalytic activity, but this method of designing catalytic activity has not been reported

Method used

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  • A method for regulating the catalytic activity of manganese dioxide nanozyme
  • A method for regulating the catalytic activity of manganese dioxide nanozyme
  • A method for regulating the catalytic activity of manganese dioxide nanozyme

Examples

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Embodiment 1

[0025] A method for regulating the catalytic activity of manganese dioxide nanozymes without changing the MnO 2 Under the premise of crystal form and morphology, by adjusting the MnO 2 Adjusting MnO by Ratio of Various Valence States of Mn Element on the Surface of Nanomaterials 2 Catalytic activity, according to the following steps:

[0026] a. Weigh α-MnO 2 Add 0.2g of nanorods to 40mL of 0.5g / L sodium periodate solution, ultrasonically react in a constant temperature water bath at 25°C for 3 hours, and then centrifuge and wash with ultrapure water for several times;

[0027] b. Put the product obtained in above a into an oven for drying after centrifugal washing.

Embodiment 2

[0029] A method for regulating the catalytic activity of manganese dioxide nanozyme, as follows:

[0030] The preparation steps were the same as in Example 1, except that the concentration of the sodium periodate solution was 0.2 g / L.

Embodiment 3

[0032] A method for regulating the catalytic activity of manganese dioxide nanozyme, as follows:

[0033] The preparation steps were the same as in Example 1, except that the reaction was carried out in an ultrasonic constant temperature water bath for 5 hours.

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Abstract

The invention discloses a method for regulating the catalytic activity of manganese dioxide nanozyme, which is characterized in that the MnO 2 On the premise of crystal form and morphology, adjust the ratio of each valence state of Mn element on the surface of MnO2 nanomaterials to adjust the MnO 2 The catalytic activity of the catalyst can be adjusted from -30% to +15%. MnO 2 Nanomaterials and periodate are mixed and stirred according to a certain ratio for 3 to 10 hours, and the product is centrifuged and washed and dried, which can increase the Mn 4+ / Mn 3+ value and reducibility to improve MnO 2 Catalytic performance; the MnO 2 Nanomaterials and sodium borohydride aqueous solution are mixed and stirred according to a certain ratio for 3 to 10 hours, and the product is centrifuged and washed for several times and then dried, which can reduce the Mn 4+ / Mn 3+ value and reducibility to reduce MnO 2 catalytic performance. The method is simple to operate, low in cost, and can obtain ideal catalytic activity MnO 2 .

Description

technical field [0001] The invention relates to the field of preparation of nanomaterials, in particular to the design of nanozymes, in particular to a method for regulating the catalytic activity of manganese dioxide nanozymes. Background technique [0002] As a new generation of artificial mimic enzymes, nanozymes are expected to replace natural enzymes and play a role in biology, medicine, agriculture, environmental governance, national defense and security. Since the first nanozyme was reported internationally (Gao L Z, Zhuang J, Nie L, et al. Intrinsic peroxidase-like activity of ferromagnetic nanoparticles. NatNanotechnol, 2007, 2(9): 577-583.), more and more Many nanozymes have emerged one after another. Discuss the catalytic mechanism of nanozymes and reveal the intrinsic relationship between the physicochemical properties and catalytic properties of nanozymes. By adjusting the confinement effect of the catalyst, changing the electronic state on the surface and the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/34B01J37/12B01J37/16
CPCB01J23/34B01J37/12B01J37/16
Inventor 何丹农孟艳霞张兆坤朱元杰周如鑫赵昆峰王萍朱君
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH