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A kind of preparation method and application of bismuth tungstate/expanded graphite flake nanocomposite material

A technology of expanded graphite sheets and composite materials, applied in chemical instruments and methods, chemical/physical processes, water treatment of special compounds, etc. The effect of enhancing and enhancing activity

Active Publication Date: 2017-11-07
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The problems existing in the application of clay are mainly reflected in the dispersion problem. For example, if the particle size of the loaded material is large, even on a benign carrier, the distribution will be uneven, agglomeration will occur, and the combination will be affected.

Method used

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  • A kind of preparation method and application of bismuth tungstate/expanded graphite flake nanocomposite material
  • A kind of preparation method and application of bismuth tungstate/expanded graphite flake nanocomposite material
  • A kind of preparation method and application of bismuth tungstate/expanded graphite flake nanocomposite material

Examples

Experimental program
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preparation example Construction

[0028] Preparation of expanded graphite:

[0029] According to the mass ratio of flake graphite, concentrated sulfuric acid, hydrogen peroxide and potassium dichromate is 10:30:5:1, take the sample, oxidize in a constant temperature water bath at 40℃, intercalate for 12 hours, and then press flake graphite 1:0.9HNO 3 Add nitric acid, intercalate twice, continue to react for 30 minutes, wash with water, dry, and instantaneously expand in a muffle furnace at 900°C to obtain expanded graphite.

Embodiment 1

[0031] First, weigh 0.17g of bismuth nitrate dissolved in 50ml of deionized water, magnetically stir for 30 minutes to obtain a white solution; then add 0.047g of sodium tungstate to the white solution, continue to magnetically stir for 30 minutes to mix to obtain a white mixed solution. Add 0.2g of expanded graphite to the solution and continue magnetic stirring for 10 minutes to obtain a black turbid solution; put the above solution into a 100ml polytetrafluoroethylene reactor, and then hydrothermally react at 180°C for 24h; after the reaction, take out the reactor to obtain the lower black precipitate. The upper layer is a clear solution; the black precipitate is washed with deionized water and absolute ethanol, then dried at 80°C, and ground to obtain a bismuth tungstate / expanded graphite sheet-layer nanostructure composite material.

[0032] X-ray powder diffraction experiment was performed on the obtained sample, and its morphology and structure were observed under a transmi...

Embodiment 2

[0040] Weigh 0.17g of bismuth nitrate dissolved in 50ml of deionized water, and magnetically stir for 30 minutes to obtain a white solution; then add 0.05g of sodium tungstate to the white solution, continue to magnetically stir for 30 minutes to mix to obtain a white mixed solution into the solution Add 0.3g of expanded graphite and continue magnetic stirring for 10 minutes to obtain a black turbid solution; put the above solution into a 100ml polytetrafluoroethylene reactor, and then hydrothermally react at 170℃ for 18h; after the reaction, take out the reactor to obtain a black precipitate in the lower layer and a clear upper layer Solution: Wash the black precipitate with deionized water and absolute ethanol, then dry at 70° C., and grind to obtain a bismuth tungstate / expanded graphite sheet-layer nanostructure composite material. The subsequent tests are as in Example 1.

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Abstract

The invention belongs to the technical field of supported composites and particularly relates to a preparation method and an application of a nanomaterial taking bismuth tungsten as an active component. Bismuth nitrate, sodium tungstate and expanded graphite are added to deionized water while stirring, then the mixture is transferred to a reaction kettle to have a heat preservation reaction under the hydrothermal condition, water washing, alcohol washing, drying and grinding are performed, and thus the bismuth tungstate / expanded graphite sheet nanocomposite is obtained. The composite is high in catalytic activity and can be applied to photocatalytic degradation of organic matters; besides, the reduction of the particle size of single bismuth tungstate particles on a supporter is effectively controlled, and agglomeration is fully avoided when prepared small-particle bismuth tungstate is supported on other clay supporters.

Description

Technical field [0001] The invention belongs to the technical field of supported composite materials, and particularly relates to a preparation method and application of a nano material using expanded graphite nanosheets as a carrier and bismuth tungstate as an active component. Background technique [0002] Bismuth Tungstate (Bi 2 WO 6 ) Is a layered structure with dielectric, luminescence, and isolation of conductors, and bismuth tungstate has photocatalytic properties under visible light, and can photodegrade water and photodegrade organic pollutants under visible light. Therefore, bismuth tungstate (Bi 2 WO 6 ) Has good application prospects in many related fields, and it is also a good choice to load it on clay as a composite material. [0003] Clay has strong adsorption capacity, good thermal stability, acid and alkali resistance, rheological properties, filling properties, and has good ion exchange, salt resistance, gelation resistance, pulping and high temperature phase chan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/31C02F1/30C02F101/38
CPCB01J23/31B01J35/004C02F1/30C02F2101/40C02F2305/10
Inventor 李霞章朱伟张作松陆晓旺左士祥姚超陈志刚
Owner CHANGZHOU UNIV