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A polypyrrole-modified nano bismuth oxybromide photocatalytic material and its preparation method and application

A photocatalytic material, bismuth oxybromide technology, applied in the field of photocatalysis, can solve the problems of difficult recovery of inorganic materials, unsatisfactory photocatalytic activity, poor catalytic effect, etc., to improve the ability of photocatalytic degradation of pollutants, excellent visible light Absorptive and conductive properties, effects of good chemical stability

Active Publication Date: 2020-10-13
XUCHANG UNIV
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Problems solved by technology

Nevertheless, the photocatalytic activity of BiOBr is still unsatisfactory, such as the rapid recombination of photogenerated charge carriers and the difficulty in recycling inorganic materials, which limit its practical application, and further improvement is needed.
[0003] In general, its photocatalytic activity can be effectively improved through effective microstructure control or efficient electron transfer pathways; for example, adding carbon-based materials with excellent optical and excellent electron transfer properties, including carbon nanotubes, carbon quantum dots , graphene and graphene quantum dots can accelerate and delay the recombination of electron-hole species in semiconductors while improving the microstructure, but the BiOBr-based photocatalytic materials in the prior art still have the problem of poor catalytic effect

Method used

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  • A polypyrrole-modified nano bismuth oxybromide photocatalytic material and its preparation method and application
  • A polypyrrole-modified nano bismuth oxybromide photocatalytic material and its preparation method and application
  • A polypyrrole-modified nano bismuth oxybromide photocatalytic material and its preparation method and application

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preparation example Construction

[0036] The present invention also provides a preparation method of the polypyrrole-modified nano-bismuth oxybromide photocatalytic material described in the above technical scheme, comprising the following steps:

[0037] Dispersing flaky nano-bismuth oxybromide in dilute acid aqueous solution containing cetyltrimethylammonium bromide and ammonium persulfate to obtain a dispersion;

[0038] Under an ice bath, after dropping the pyrrole monomer into the dispersion liquid, the in-situ solution polymerization reaction is carried out to obtain the polypyrrole-coated and modified nano-bismuth oxybromide photocatalyst material.

[0039]In the present invention, the preparation method of the flaky nano-bismuth oxybromide is preferably: dissolving bismuth nitrate and potassium bromide in dilute nitric acid aqueous solution, and performing one-step photochemical reaction treatment under simulated sunlight irradiation to obtain flaky nano-bromide Bismuth oxide, the mass fraction of the ...

Embodiment 1

[0054] (1) in the 15mL dilute nitric acid that mass fraction is 3%, add 0.8mmol bismuth nitrate pentahydrate and 0.8mmol potassium bromide respectively, after all dissolving, carry out photoreaction under the irradiation of 500W xenon lamp, reaction time is controlled at 0.5h, After the reaction is finished, centrifugation, multiple washings, and vacuum drying are performed to obtain flaky nano-bismuth oxybromide.

[0055] (2) Weigh 0.0182g of cetyltrimethylammonium bromide and 0.0228g of ammonium persulfate, add it to 5mL of dilute hydrochloric acid with a concentration of 1mol / L, after uniform dissolution, mix the 25mg flake bromine obtained by the above reaction Bismuth oxide was dispersed in it, and then 0.35mL of pyrrole monomer was added dropwise in an ice bath, and then reacted and polymerized at room temperature (25°C) for 18h. The product was centrifuged, washed and vacuum-dried to obtain a brown polypyrrole-modified nano bromide oxide Bismuth composite (BiOBr / Ppy). ...

Embodiment 2

[0064] (1) in the 15mL dilute nitric acid that mass fraction is 3%, add 0.8mmol bismuth nitrate pentahydrate and 0.8mmol potassium bromide respectively, after all dissolving, carry out photoreaction under the irradiation of 500W xenon lamp, reaction time is controlled at 0.5h, After the reaction is finished, centrifugation, multiple washings, and vacuum drying are performed to obtain flaky nano-bismuth oxybromide.

[0065] (2) Weigh 0.0182g of cetyltrimethylammonium bromide and 0.0228g of ammonium persulfate, add 5mL of dilute hydrochloric acid with a concentration of 1mol / L, after uniform dissolution, mix the 15mg flake bromine obtained by the above reaction Bismuth oxide was dispersed in it, and then 0.35mL of pyrrole monomer was added dropwise in an ice bath, and then reacted and polymerized at room temperature (25°C) for 18h. The product was centrifuged, washed and vacuum-dried to obtain a brown polypyrrole-modified nano bromide oxide Bismuth composite material, named BiOB...

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Abstract

The invention provides a polypyrrole modified nano bismuth oxybromide photocatalytic material as well as a preparation method and application thereof, and belongs to the field of photocatalysis. In the present invention, polypyrrole is used as a carbon-nitrogen coexisting heterocyclic conjugated conductive polymer, possesses both excellent visible light absorption and electric conduction characteristics, and possesses good chemical stability in most solvent systems, therefore, good recycling performance is achieved, and polypyrrole is adopted in functional modification on a bismuth oxybromidesemiconductor; the light absorption performance of the bismuth oxybromide semiconductor can be effectively improved; the electron transfer between mutual interfaces of semiconductor materials is accelerated; the efficiency of photo-induced electron hole separation under illumination is effectively improved, the efficiency of electron hole separation is greatly influenced by covalent attraction andmatching degree between interface bonding, and the efficiency of active free radical generation is further influenced, so that a novel efficient composite photocatalytic material is obtained, and thephotocatalytic degradation capability of the novel efficient composite photocatalytic material is improved.

Description

technical field [0001] The invention relates to the technical field of photocatalysis, in particular to a polypyrrole-modified nano-bismuth oxybromide photocatalytic material and a preparation method and application thereof. Background technique [0002] Among many semiconductor photocatalysts, the great potential of bismuth oxybromide semiconductors with a suitable band gap (2.80eV) in environmental pollution control has attracted widespread attention, the main reason being that it has the ability to act under visible light or simulated sunlight. Good photocatalytic redox activity and environmental friendliness. Nevertheless, the photocatalytic activity of BiOBr is still unsatisfactory, such as the rapid recombination of photogenerated charge carriers and the difficulty in recycling inorganic materials, which limit its practical application, and further improvement is needed. [0003] In general, its photocatalytic activity can be effectively improved through effective mic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/06B01J27/08C02F1/30C02F101/30
CPCB01J27/08B01J31/06B01J35/004C02F1/30C02F2101/308C02F2101/40C02F2305/10
Inventor 铁伟伟郑朝何伟伟岳红伟朱聪旭
Owner XUCHANG UNIV
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