Synthetic method of tungsten trioxide/ZIF-8 composite catalyst

Active Publication Date: 2020-09-25
HENAN NORMAL UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

It is reported that tungsten trioxide nanosheets have a high redox potential, however, the surface area of ​​tungsten trioxide is very low, and the adsorption capacity is extremely limited

Method used

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  • Synthetic method of tungsten trioxide/ZIF-8 composite catalyst
  • Synthetic method of tungsten trioxide/ZIF-8 composite catalyst
  • Synthetic method of tungsten trioxide/ZIF-8 composite catalyst

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preparation example Construction

[0026] A kind of synthetic method of tungsten trioxide / ZIF-8 composite catalyst, comprises the following steps at least:

[0027] (1) Disperse tungsten trioxide nanosheets in deionized water, add 2-methylimidazole aqueous solution and sonicate for 5-15min;

[0028] (2) Add 2-methylimidazole aqueous solution drop by drop, and stir for 8-15min;

[0029] (3) Add the zinc acetate aqueous solution prepared now, and stir at room temperature for 1.5-2.5 hours;

[0030] (4) Washing with washing solution and drying to obtain the target product.

[0031] Preferably, the preparation method of tungsten trioxide nanosheets is as follows: dissolving sodium tungstate dihydrate and polyvinylpyrrolidone in deionized water; then adding acetic acid dropwise to obtain a mixed solution, ultrasonicating the mixed solution for 30 minutes and putting it into high pressure Reaction in the kettle for 7-9h, the reaction temperature is 180-220°C, and the crude product is obtained after natural cooling ...

Embodiment 1

[0040] A synthesis method of tungsten trioxide / ZIF-8 composite catalyst, dissolving 660mg sodium tungstate dihydrate and 100mg polyvinylpyrrolidone (Fw=58000) in 12mL deionized water; then adding 1ml acetic acid dropwise to obtain a yellow-green mixed solution , put the mixed solution into an autoclave coated with Teflon liner to react for 7h after ultrasonication for 30 minutes. , and the powder was washed 6 times with deionized water and absolute ethanol to obtain a wet product, and the wet product was placed in a vacuum drying oven to dry to obtain tungsten trioxide nanosheets. Disperse 2.2mg of tungsten trioxide nanosheets in 8ml of deionized water, add 0.1ml of 2-methylimidazole aqueous solution (0.28mol / L) and sonicate for 5min; then add 0.9ml of 2-methylimidazole dropwise Aqueous solution (0.28mol / L), after stirring for 8-15min, add the newly prepared zinc acetate aqueous solution with a concentration of 0.1mol / L, and stir at room temperature for 1.5h; use deionized wat...

Embodiment 2

[0042] A synthesis method of tungsten trioxide / ZIF-8 composite catalyst, dissolving 660mg sodium tungstate dihydrate and 100mg polyvinylpyrrolidone (Fw=58000) in 12mL deionized water; then adding 1ml acetic acid dropwise to obtain a yellow-green mixed solution , put the mixed solution into an autoclave coated with polytetrafluoroethylene to react for 8 hours after ultrasonication for 30 minutes. , and the powder was washed 7 times with deionized water and absolute ethanol to obtain a wet product, and the wet product was placed in a vacuum drying oven to dry to obtain tungsten trioxide nanosheets. Disperse 2.2mg of tungsten trioxide nanosheets in 8ml of deionized water, and add 0.1ml of 2-methylimidazole aqueous solution (1.12mol / L) to it and sonicate for 10min; add 0.9ml of 2-methylimidazole aqueous solution drop by drop (1.12mol / L), stirred for 10min; added the newly prepared zinc acetate aqueous solution with a concentration of 0.4mol / L, stirred at room temperature for 2.5h,...

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Abstract

The invention belongs to the technical field of photocatalysis, and particularly relates to a tungsten trioxide/ZIF-8 composite catalyst synthesis method, which at least comprises: (1) dispersing tungsten trioxide nanosheets in deionized water, adding a 2-methylimidazole aqueous solution, and carrying out ultrasonic treatment for 5-15 min; (2) dropwise adding a 2-methylimidazole aqueous solution,and stirring the solution for 8-15 minutes; (3) adding a prepared zinc acetate aqueous solution, and stirring the solution for 1.5-2.5 hours at room temperature; and (4) washing the mixed solution with a washing solution, and drying the mixed solution to obtain the target product. Tungsten trioxide has a relatively high oxidation-reduction potential and the ZIF-8 is a crystalline porous material,has a relatively high specific surface area, a porous structure, rich Lewis base sites and relatively high adsorption capacity, so that the composite catalyst is capable of effectively improving the adsorption capacity of tungsten trioxide by utilizing respective advantages of ZIF-8 and Lewis base sites and combining ZIF-8 with the Lewis base sites to prepare a compound.

Description

technical field [0001] The invention relates to the technical field of photocatalysis, in particular to a synthesis method of a tungsten trioxide / ZIF-8 composite catalyst. Background technique [0002] Photocatalysis is the use of photoelectrons or holes generated by solar radiation to trigger the splitting of many chemical bonds under mild conditions. So far, photocatalysis has been used to decompose a variety of chemical bonds, such as C=O, C-C, C-H, N≡N . Generally speaking, the photocatalytic reaction mainly includes three steps: the first is the adsorption and activation of the reactant molecules on the surface of the photocatalyst; the second step is the transfer of the photocatalytic carrier between the reactant molecules and the photocatalyst; the third step is the product The parse escapes. First, the adsorption and activation of reactant molecules is the key step in the next photocatalytic reaction. The larger surface area and porous structure are conducive to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22B01J31/34
CPCB01J31/1815B01J35/004B01J31/34B01J2531/26Y02P20/52
Inventor 汪瑾潘家梁徐芳武大鹏高志勇王栋蒋凯
Owner HENAN NORMAL UNIV
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