Tungsten oxide nanosheets, preparation method and catalysis application thereof

A technology of tungsten oxide and nanosheets, which is applied in the field of nanomaterials, can solve problems such as difficult preparation methods, and achieve the effects of uniform appearance, easy operation, and simple preparation methods

Inactive Publication Date: 2016-04-20
NANYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Regardless of tungsten oxide nanosheets or oxides with oxy

Method used

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  • Tungsten oxide nanosheets, preparation method and catalysis application thereof
  • Tungsten oxide nanosheets, preparation method and catalysis application thereof
  • Tungsten oxide nanosheets, preparation method and catalysis application thereof

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Experimental program
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Effect test

Embodiment 1

[0043] There is the tungsten oxide (WO) of oxygen hole of the present invention 3-x ) The preparation method step of nanosheet is:

[0044] (1) Dissolve 1 mmol of sodium tungstate dihydrate in 5 ml of water, stir for 5 minutes, and make a transparent solution;

[0045] (2) Add 5 milliliters of ethanol to the above solution, stir for 5 minutes;

[0046] (3) Add 5 milliliters of corresponding hydrochloric acid in above-mentioned solution, stir 5 minutes;

[0047] (4) Add corresponding 0.1 gram of polyethylene glycol to the above solution, stir for 5 minutes;

[0048] (5) Transfer the above mixture into a 50 ml or 100 ml autoclave lined with polytetrafluoroethylene, and react at 150°C for 10 hours; or transfer the above mixture into a 100 ml or 205 ml round bottom flask, and stir to reflux 1 hour; cool to room temperature;

[0049] (6) Pour the above-mentioned cooled reaction mixture into 500 milliliters of distilled water, collect the precipitate, wash with deionized water a...

Embodiment 2

[0051] There is the tungsten oxide (WO) of oxygen hole of the present invention 3-x) The preparation method step of nanosheet is:

[0052] (1) Dissolve 2 mmol of sodium tungstate dihydrate in 10 ml of water, stir for 10 minutes, and make a transparent solution;

[0053] (2) Add 10 milliliters of ethanol to the above solution, stir for 10 minutes;

[0054] (3) Add 10 milliliters of nitric acid to the above solution, stir for 10 minutes;

[0055] (4) Add 0.2 gram of polyethylene glycol 100000 to the above solution, and stir for 10 minutes;

[0056] (5) Transfer the above mixture into a 50 ml autoclave lined with polytetrafluoroethylene, react at 180°C for 10 hours, and cool to room temperature;

[0057] (6) Pour the above-mentioned cooled reaction mixture into 500 milliliters of distilled water, collect the precipitate, wash with deionized water and absolute ethanol successively, and vacuum-dry to obtain the blue tungsten oxide (WO) with oxygen holes. 3-x )Nanosheets.

Embodiment 3

[0059] There is the tungsten oxide (WO) of oxygen hole of the present invention 3-x ) The preparation method step of nanosheet is:

[0060] (1) Dissolve 5 mmol of sodium tungstate dihydrate in 20 ml of water, stir for 20 minutes, and make a transparent solution;

[0061] (2) Add 20 milliliters of ethanol or methanol to the above solution, and stir for 20 minutes;

[0062] (3) Add 20 milliliters of corresponding hydrochloric acid, nitric acid or sulfuric acid to the above solution, and stir for 20 minutes;

[0063] (4) add corresponding polyethylene glycol 0.5 gram surfactant in above-mentioned solution, stir 20 minutes;

[0064] (5) Transfer the above mixture into a 50ml or 100ml autoclave lined with polytetrafluoroethylene, and react at 180°C for 24 hours; or transfer the above mixture into a 100ml or 205ml round bottom flask, and stir to reflux 24 hours; cool to room temperature;

[0065] (6) Pour the above-mentioned cooled reaction mixture into 500 milliliters of distil...

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Abstract

The invention provides tungsten oxide nanosheets. According to the tungsten oxide nanosheets, size is 140-160 nanometers, thickness is 10-20 nanometers, color is from light green to blackish green, and a sample is insoluble in water, acid, alkali and conventional organic solvents, and has catalytic activity. The invention also provides a preparation method of the tungsten oxide nanosheets, which is characterized in that under acidic condition, sodium tungstate monohydrate is taken as a raw material, a proper amount of an additive is added in a solvent, and the tungsten oxide nanosheets can be directly synthesized by a solvothermal method or a direct heating method through one step. The invention also provides an application of the tungsten oxide nanosheets in aspects of catalytic oxidation of thioether, catalytic oxidation of secondary amine, catalysis of olefin epoxidation, and catalysis of visible light for degrading organic dye pollutants. The preparation method has the advantages of simple process, low cost, easy operation, high yield, and purity, and the catalytic reaction has the advantages of zero discharge and zero pollution.

Description

technical field [0001] The invention relates to nanometer materials, in particular to a tungsten oxide nanosheet, and also relates to a preparation method and catalytic application of the nanosheet. Background technique [0002] Tungsten oxide is a metal oxide semiconductor material, which has a wide range of applications. It can be used not only as a photoelectric material, but also as a photocatalyst. At the same time, tungsten oxide can also catalyze reactions such as oxidation and desulfurization. It is well known that their microscopic morphology, size, crystallinity, and specific surface area all have a significant impact on catalytic performance. The preparation of oxide nanomaterials with a single shape is quite difficult, and generally can only be obtained by high-temperature heat treatment. For example, Chinese Patent No. 201310252837.0 discloses a method for obtaining tungsten oxide nano-powders through high-temperature heat treatment at 520 ° C. Chinese Patent Ap...

Claims

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Application Information

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IPC IPC(8): B01J23/30C01G41/02C07C315/02C07C317/14C07C249/02C07C251/24C07D301/12C07D303/04A62D3/17A62D101/28
CPCA62D2101/28B01J23/30C01G41/02C01P2004/64C07C249/02C07C251/24C07C315/02C07C317/14C07D301/12C07D303/04
Inventor 鲍克燕毛武涛谢海泉刘光印罗保民李贝贝
Owner NANYANG NORMAL UNIV
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