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Preparation method of ultrafine tungsten trioxide material

A technology of tungsten trioxide and sodium tungstate, applied in the nano field, can solve the problems of dispersion and serious agglomeration of ultrafine tungsten trioxide, and achieve the effect of solving the problem of impurities

Inactive Publication Date: 2018-11-20
吴亚良
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems in the prior art, the present invention provides a method for preparing ultrafine tungsten trioxide material, which solves the serious problem of agglomeration of ultrafine tungsten trioxide in the prior art, and precipitates tungsten trioxide through methanol electrolysis, and through Electrolysis to passivate tungsten trioxide to achieve the purpose of dispersion

Method used

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  • Preparation method of ultrafine tungsten trioxide material
  • Preparation method of ultrafine tungsten trioxide material

Examples

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Embodiment 1

[0031] A method for preparing an ultrafine tungsten trioxide material, comprising the steps of:

[0032] Step 1: Add sodium tungstate to distilled water and stir ultrasonically until it is completely dispersed, then add methylcellulose and stir ultrasonically at low temperature until completely dissolved to obtain an aqueous solution of sodium tungstate;

[0033] Step 2, add concentrated hydrochloric acid to the sodium tungstate aqueous solution and mechanically stir until completely dispersed, then add absolute ethanol and stir evenly to obtain a mixed solution;

[0034] Step 3, adding the mixed solution into the reaction kettle to stand for heating for 1 hour, then ultrasonically dispersing at a constant temperature for 2 hours, and after filtering while hot, use anhydrous ethanol to clean the filtrate at a constant temperature ultrasonically for several times to obtain a gel;

[0035] Step 4, put the gel into anhydrous methanol and ultrasonically disperse it evenly, then ca...

Embodiment 2

[0046] A method for preparing an ultrafine tungsten trioxide material, comprising the steps of:

[0047] Step 1: Add sodium tungstate to distilled water and stir ultrasonically until it is completely dispersed, then add methylcellulose and stir ultrasonically at low temperature until completely dissolved to obtain an aqueous solution of sodium tungstate;

[0048] Step 2, add concentrated hydrochloric acid to the sodium tungstate aqueous solution and mechanically stir until completely dispersed, then add absolute ethanol and stir evenly to obtain a mixed solution;

[0049] Step 3, adding the mixed solution into the reaction kettle and standing for heating for 3 hours, then ultrasonically dispersing at a constant temperature for 4 hours, and after filtering while hot, use absolute ethanol to clean the filtrate at a constant temperature and ultrasonically for several times to obtain a gel;

[0050] Step 4, put the gel into anhydrous methanol and ultrasonically disperse it evenly,...

Embodiment 3

[0061] A method for preparing an ultrafine tungsten trioxide material, comprising the steps of:

[0062] Step 1: Add sodium tungstate to distilled water and stir ultrasonically until it is completely dispersed, then add methylcellulose and stir ultrasonically at low temperature until completely dissolved to obtain an aqueous solution of sodium tungstate;

[0063] Step 2, add concentrated hydrochloric acid to the sodium tungstate aqueous solution and mechanically stir until completely dispersed, then add absolute ethanol and stir evenly to obtain a mixed solution;

[0064] Step 3, adding the mixed solution into the reaction kettle to stand for heating for 2 hours, then ultrasonically dispersing at a constant temperature for 3 hours, and after filtering while hot, use absolute ethanol to clean the filtrate at a constant temperature and ultrasonically for several times to obtain a gel;

[0065] Step 4, put the gel in anhydrous methanol and ultrasonically disperse it evenly, then ...

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Abstract

The invention discloses a preparation method of an ultrafine tungsten trioxide material. The preparation method comprises the following steps: step one, adding sodium tungstate into distilled water and carrying out ultrasonic stirring until a mixture is completely dispersed, then adding methyl cellulose and carrying out low-temperature ultrasonic stirring until the mixture is completely dissolvedto obtain an aqueous solution of sodium tungstate; step two, adding concentrated hydrochloric acid into the aqueous solution of the sodium tungstate, and carrying out mechanical stirring until the mixture is completely dispersed; adding absolute ethyl alcohol and uniformly stirring to obtain a mixed solution; step three, adding a mixed solution into a reaction kettle, standing, carrying out heating reaction for 1 to 3 hours, then carrying out thermostatic ultrasonic dispersion for 2 to 4 hours, filtering in a hot state, and carrying out thermostatic ultrasonic cleaning on filtrate with the absolute ethyl alcohol for multiple times to obtain gel; and step four, putting the gel into the absolute ethyl alcohol, and carrying out uniform ultrasonic dispersion and then electrolytic reaction for2 to 8 hours; and then adding distilled water, continuously carrying out the electrolytic reaction for 1 to 2 hours and filtering to obtain ultrafine tungsten trioxide. According to the preparation method disclosed by the invention, tungsten trioxide is separated by electrolyzing methanol and is passivated by electrolyzing, so that the aim of dispersion is achieved.

Description

technical field [0001] The invention belongs to the field of nanotechnology, and in particular relates to a preparation method of an ultrafine tungsten trioxide material. Background technique [0002] As a transition metal compound, tungsten trioxide has semiconducting properties and is a potential sensitive material that is sensitive to a variety of gases; ultrafine tungsten trioxide has significant surface effects because of its large specific surface area. Electromagnetic waves have a strong absorption capacity and can be used as excellent solar energy absorbing materials and recessive materials. In addition to good photochromic properties and gas-sensing properties, tungsten trioxide has special catalytic properties and is widely used in chemical and petrochemical industries, such as the oxidation of methanol to formaldehyde and the oxidation of propylene to acrolein. The diameter is mostly in micron or submicron level. [0003] In industry, tungsten oxide is generally...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01J33/00B01J35/00B01J37/06B01J37/34
CPCB01J23/30B01J33/00B01J37/06B01J37/343B01J37/348B01J35/39
Inventor 吴亚良
Owner 吴亚良
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