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Bismuth subcarbonate photocatalyst and preparation method thereof

A photocatalyst, bismuth oxycarbonate technology, applied in the field of photocatalysis, can solve the problems of high electron-hole pair recombination rate, low crystallinity of bismuth oxycarbonate, uncontrollable form of bismuth oxycarbonate, etc. The effect of improving photocatalytic performance and inhibiting recombination

Active Publication Date: 2012-07-04
铜陵博雅渡业新材料科技有限公司
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Problems solved by technology

However, TiO 2 There are still the following deficiencies in the use of photocatalytic materials for indoor air pollution control: TiO 2 The recombination rate of electron-hole pairs is high, and the photon quantum efficiency is low; commonly used TiO 2 The preparation process of catalytic materials often requires high temperature treatment, which consumes a lot of energy and is difficult to realize industrial application
The Chinese patent document with the patent publication number CN101817555A discloses a bismuth oxycarbonate microflower material with a hierarchical structure and a preparation method thereof. In the method, bismuth nitrate is first dissolved in dilute nitric acid, and then excessive carbonic acid is added dropwise. In sodium solution, obtain bismuth oxycarbonate microflower material with graded structure, but the bismuth oxycarbonate crystallinity that this method prepares is not high, and structure is unstable, and photocatalytic activity is not ideal enough; In order to improve the stability of bismuth oxycarbonate photocatalyst , the patent publication number is that the Chinese patent document of CN102275987A discloses a kind of nano-micron plate bismuth oxycarbonate material and preparation method thereof, first prepare urea aqueous solution, then it is mixed with bismuth nitrate pentahydrate, then the mixed solution obtained is in The pressure is above 3MPa and the temperature is 100°C to 200°C for 1 hour to 4 hours. After the reaction is completed, the nano-micron bismuth oxycarbonate material is obtained, but the shape of the bismuth oxycarbonate prepared by this method is uncontrollable, making the light Catalytic activity is low

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  • Bismuth subcarbonate photocatalyst and preparation method thereof
  • Bismuth subcarbonate photocatalyst and preparation method thereof
  • Bismuth subcarbonate photocatalyst and preparation method thereof

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preparation example Construction

[0036] The invention provides a kind of preparation method of bismuth oxycarbonate photocatalyst, comprises the following steps:

[0037] A bismuth source and a soluble carbonate are subjected to a hydrothermal reaction in an aqueous solution to obtain a bismuth oxycarbonate photocatalyst;

[0038] The bismuth source is bismuth citrate or bismuth ammonia citrate.

[0039] In the present invention, a bismuth source and a soluble carbonate are first dissolved in water to obtain a mixed solution; the bismuth source is bismuth citrate or bismuth ammonium citrate. In the present invention, the aqueous solution of soluble carbonate is preferably firstly prepared, and then a bismuth source is added to the aqueous solution of soluble carbonate to obtain a mixed solution. In the present invention, the soluble carbonate is preferably sodium carbonate, sodium bicarbonate, potassium carbonate or potassium bicarbonate, more preferably sodium carbonate or potassium bicarbonate; the water is ...

Embodiment 1

[0052] 0.23g sodium carbonate was dissolved in 75mL deionized water to obtain a sodium carbonate solution with a mass concentration of 0.3%, to which 1.6g bismuth citrate was added, and after stirring for 30 minutes, the resulting mixed solution was moved into a 100mL hydrothermal kettle, The reaction was carried out at 180° C. for 24 hours. After the reaction, the reaction product was taken out, centrifuged, filtered, washed twice with water and washed with ethanol twice, and then dried at 80° C. to obtain a bismuth oxycarbonate photocatalyst.

[0053] The present invention carries out XRD analysis to the bismuth oxycarbonate photocatalyst that obtains, and the result shows, the bismuth oxycarbonate photocatalyst that present embodiment prepares has stable and complete (BiO) 2 CO 3 Crystal structure; the present invention carries out SEM scanning analysis to the bismuth oxycarbonate photocatalyst that obtains, and the result is as follows figure 1 as shown, figure 1 For th...

Embodiment 2

[0056] 0.46g sodium carbonate is dissolved in 75mL deionized water, obtains the sodium carbonate solution that mass concentration is 0.61%, adds 1.6g bismuth citrate wherein, after stirring for 30 minutes, the mixed solution obtained is moved in the 100mL hydrothermal kettle, in React at 180°C for 24 hours. After the reaction, the reaction product was centrifuged, filtered, washed with water and ethanol twice, and then dried at 80° C. to obtain a bismuth oxycarbonate photocatalyst.

[0057] The present invention carries out X-ray diffraction analysis to the bismuth oxycarbonate photocatalyst that obtains, and the result shows, the bismuth oxycarbonate catalyst that present embodiment prepares has stable and complete (BiO) 2 CO 3 Crystal structure; The present invention carries out TEM scanning analysis to the bismuth oxycarbonate photocatalyst that obtains, and the result is as follows figure 2 as shown, figure 2 For the TEM image of the bismuth oxycarbonate photocatalyst...

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Abstract

The invention provides a bismuth subcarbonate photocatalyst which is a bismuth subcarbonate nanometer sheet or a microsphere formed by the bismuth subcarbonate nanometer sheet. The bismuth subcarbonate photocatalyst provided by the invention is obtained by carrying out hydrothermal reaction on a bismuth source and soluble carbonate in an aqueous solution, wherein the bismuth source is bismuth citrate or bismuth citrate ammonia. The bismuth subcarbonate photocatalyst takes the bismuth citrate or the bismuth citrate ammonia as the bismuth source, and the nanometer sheet shaped bismuth subcarbonate or the microsphere formed by the bismuth subcarbonate nanometer sheet is obtained in a hydrothermal reaction mode. The morphology obtained by the bismuth subcarbonate photocatalyst can accelerate the separation and transmission of the photoproduction electrons and holes of the bismuth subcarbonate photocatalyst so as to inhibit the composition of the electrons and holes and accelerate the diffusion and transfer of reactants and reaction products; reflection is generated between rays and a nanometer layer; and the use ratio of the light source is increased so as to improve the catalytic activity of the bismuth subcarbonate photocatalyst. An experiment result shows that the removal rate on NO by the bismuth subcarbonate photocatalyst provided by the invention is 20-50%.

Description

technical field [0001] The invention relates to the technical field of photocatalysis, in particular to a bismuth oxycarbonate photocatalyst and a preparation method thereof. Background technique [0002] About 70% to 90% of people's life is spent indoors (such as living rooms, classrooms, conference rooms, offices, cars, etc.). Volatile organic compounds such as nitrogen oxides, formaldehyde, and benzene series are ubiquitous in indoor air, which are toxic and carcinogenic, will damage blood components and cardiovascular system, cause gastrointestinal disorders, etc., and seriously affect human health. Moreover, due to the airtightness of modern buildings, the problem of indoor air pollution in buildings is becoming more and more prominent, and the cases of sick building syndrome caused by this are increasing day by day. The health problems caused by indoor air pollutants are attracting more and more attention from the general public, and it is imminent to develop efficien...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/232B01J35/08B01J37/10
Inventor 董帆郑旭煦傅敏孙艳娟
Owner 铜陵博雅渡业新材料科技有限公司
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