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Preparation method of nanosheet self-assembled C-doped (BiO)2CO3 microsphere visible light catalyst

A technology of self-assembly and nanosheets, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve problems such as low crystallinity of bismuth oxycarbonate, unstable structure, and unsatisfactory photocatalytic activity

Active Publication Date: 2012-09-19
江苏碧峰环保科技有限公司
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Problems solved by technology

[0005] 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, bismuth oxycarbonate microflower material with hierarchical structure is obtained, but the crystallinity of bismuth oxycarbonate prepared by this method is not high, the structure is unstable, and the photocatalytic activity is not ideal enough.
The Chinese patent document whose patent publication number is CN102275987A discloses a kind of bismuth oxycarbonate material and preparation method thereof of nano-micron plate, first prepares urea aqueous solution, then mixes it with bismuth nitrate pentahydrate, and then mixes the obtained mixed solution under pressure The temperature 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 plate bismuth oxycarbonate material is obtained, but the shape of the bismuth oxycarbonate prepared by this method is uncontrollable, which makes the photocatalytic less active
[0006] Existing literature has reported (BiO) 2 CO 3 Without doping, the bandgap width is 3.1-3.5eV, it cannot absorb visible light, and it has photocatalytic activity only under ultraviolet light irradiation, which limits (BiO) 2 CO 3 Applications of bismuth-like photocatalysts

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  • Preparation method of nanosheet self-assembled C-doped (BiO)2CO3 microsphere visible light catalyst
  • Preparation method of nanosheet self-assembled C-doped (BiO)2CO3 microsphere visible light catalyst
  • Preparation method of nanosheet self-assembled C-doped (BiO)2CO3 microsphere visible light catalyst

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Embodiment example 1

[0036] Dissolve 0.46g of sodium carbonate in 75mL of deionized water, add 0.0580g of glucose to it, then add 1.6g of bismuth citrate (the molar ratio of bismuth citrate to sodium carbonate is 0.926:1, the molar ratio of bismuth citrate to glucose Ratio is 12.476:1, bismuth citrate concentration is 0.0536mol / L), after stirring for 30 minutes, the mixed solution obtained is moved into a 100mL autoclave, and reacted at 180°C for 24 hours. After the reaction, the reaction product was taken out, the reaction product was centrifuged, filtered, washed twice with water and washed with ethanol twice, and then dried the obtained solid at 80°C to obtain C-doped (BiO) 2 CO 3 catalyst of light.

[0037] Doping the resulting C (BiO) 2 CO 3 The photocatalyst was analyzed by UV-vis DRS, the results are as follows figure 1 as shown, figure 1 C-doped (BiO) prepared for Example 1 of the present invention 2 CO 3 The UV-vis DRS spectrum of the photocatalyst, the results show that, with undo...

Embodiment example 2

[0040] Dissolve 0.46g of sodium carbonate in 75mL of deionized water, add 0.1160g of glucose to it, then add 1.6g of bismuth citrate (the molar ratio of bismuth citrate to sodium carbonate is 0.926:1; the molar ratio of bismuth citrate to glucose The ratio is 6.238:1; the bismuth citrate concentration is 0.0536mol / L), after stirring for 30 minutes, the resulting mixed solution was moved into a 100mL autoclave, and reacted at 180°C for 24 hours. After the reaction, the reaction product was taken out, the reaction product was centrifuged, filtered, washed twice with water and washed with ethanol twice, and then dried the obtained solid at 80°C to obtain C-doped (BiO) 2 CO 3 catalyst of light.

[0041] image 3 For the UV-vis DRS collection of illustrative plates of the photocatalyst that the embodiment of the present invention 2 prepares, the result shows, with undoped (BiO) 2 CO 3 In contrast, due to the effect of C doping, the C doped (BiO) prepared in this example 2 CO ...

Embodiment example 3

[0044] Dissolve 0.46g of sodium carbonate in 75mL of deionized water, add 0.20g of glucose to it, then add 1.6g of bismuth citrate (the molar ratio of bismuth citrate to sodium carbonate is 0.926:1; the molar ratio of bismuth citrate to glucose The ratio is 3.618:1; the bismuth citrate concentration is 0.0536mol / L), after stirring for 30 minutes, the resulting mixed solution was moved into a 100mL autoclave, and reacted at 180°C for 24 hours. After the reaction, the reaction product was taken out, the reaction product was centrifuged, filtered, washed twice with water and washed with ethanol twice, and then dried the obtained solid at 80°C to obtain C-doped (BiO) 2 CO 3 catalyst of light.

[0045] Figure 5 For the UV-vis DRS collection of illustrative plates of the photocatalyst that the embodiment of the present invention 3 prepares, the result shows, with undoped (BiO) 2 CO 3 In contrast, due to the effect of C doping, the C doped (BiO) prepared in this example 2 CO 3...

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Abstract

The invention discloses a preparation method of a nanosheet self-assembled C-doped (BiO)2CO3 microsphere visible light catalyst, which comprises the following steps: (1) dissolving a bismuth-containing precursor, a soluble carbonate and a doping carbon source in a water solution, stirring for 30 minutes, transferring the obtained mixed solution into a high-pressure hydrothermal kettle, and carrying out hydrothermal reaction at 120-250 DEG C for 3-100 hours; and (2) after the hydrothermal reaction finishes, cooling, filtering out the precipitate, respectively washing the precipitate with deionized water and ethanol, and drying to obtain the nanosheet self-assembled C-doped (BiO)2CO3 microspheres. According to the C-doped (BiO)2CO3 prepared by the method disclosed by the invention, the doping C element reduces the energy gap of (BiO)2CO3, and the (BiO)2CO3 has visible light catalytic activity. The experimental result proves that the NO removal rate of the bismuthyl carbonate photocatalyst disclosed by the invention is 30-45%, which indicates that the bismuthyl carbonate photocatalyst has high visible light catalytic activity.

Description

technical field [0001] What the present invention relates to is a kind of nanosheet self-assembled C-doped (BiO) 2 CO 3 Preparation method of microsphere visible light catalyst. Background technique [0002] Environmental pollution and energy shortage are the major challenges facing mankind at present, and the use of solar energy to solve global environmental and energy problems has attracted more and more attention from scholars at home and abroad. Photocatalysis can directly use the visible light in solar energy to degrade and mineralize various pollutants in water and air, and can convert low-density solar light energy into high-density chemical energy and electrical energy. Energy and other aspects have great application potential. [0003] The key to the application of photocatalytic technology to the environment and energy is to develop high-efficiency photocatalytic materials. However, the existing photocatalytic materials have low light quantum conversion efficie...

Claims

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Application Information

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IPC IPC(8): B01J27/232B01D53/86B01D53/56
Inventor 董帆盛重义金瑞奔周斌
Owner 江苏碧峰环保科技有限公司
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