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BiOBr0.2I0.8/graphene composite visible-light-induced photocatalyst and preparation method thereof

A graphene composite and visible light technology, which is applied in the field of photocatalysis, can solve the problems of bismuth oxyhalide solid solution/graphene composite visible light catalyst, and achieve high visible light catalytic activity, uniform particle size, and simple preparation process.

Inactive Publication Date: 2013-07-03
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, there is no report of bismuth oxyhalide solid solution / graphene composite visible light catalyst.

Method used

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  • BiOBr0.2I0.8/graphene composite visible-light-induced photocatalyst and preparation method thereof
  • BiOBr0.2I0.8/graphene composite visible-light-induced photocatalyst and preparation method thereof
  • BiOBr0.2I0.8/graphene composite visible-light-induced photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (a) Disperse 0.050 g of graphite oxide in 7 ml of dehydrated ethanol solution, and ultrasonicate for 2 h to obtain a suspension of graphene oxide;

[0028] (b) At room temperature, dissolve 0.0617 g of sodium bromide and 0.8224 g of potassium iodide in 4 ml of dehydrated ethylene glycol;

[0029] (c) 1.4552 g of bismuth nitrate is dissolved in 35 ml of ethylene glycol;

[0030] (d) Slowly add the solution obtained in step (b) dropwise to the solution obtained in step (c), and continue to stir for 1h;

[0031] (e) slowly adding the suspension obtained in step (a) dropwise to the solution obtained in step (d);

[0032] (f) After stirring the solution obtained in step (e) for 1 h, transfer it to a polytetrafluoroethylene-lined autoclave, and conduct a crystallization reaction at 160 °C for 12 h;

[0033] (g) The resulting solid product was filtered, washed, and dried at 100°C for 24 h to obtain 10.0% BiOBr with a mass percentage of graphene 0.2 I 0.8 / Graphene composit...

Embodiment 2

[0036] Operation process is except following difference, all the other are with embodiment 1.

[0037]Disperse 0.025 g of graphite oxide in 5 ml of ethanol and sonicate for 2 h. Finally, BiOBr with a graphene content of 5.0 wt.% was obtained 0.2 I 0.8 / Graphene composite visible light catalyst.

[0038] The XRD result of the sample can be found in figure 1 , the TEM result of the sample is similar to that of Example 1, and the ultraviolet-visible absorption spectrum is shown in Figure 4 , photocatalytic performance see Figure 5 .

Embodiment 3

[0040] Operation process is except following difference, all the other are with embodiment 1.

[0041] Disperse 0.075 g of graphite oxide in 9 ml of ethanol and ultrasonicate for 2 h. Finally, BiOBr with a graphene content of 15.0 wt.% was prepared 0.2 I 0.8 / Graphene composite visible light catalyst.

[0042] The XRD result of the sample can be found in figure 1 , the TEM result of the sample is similar to that of Example 1, and the ultraviolet-visible absorption spectrum is shown in Figure 4 , photocatalytic performance see Figure 5 .

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Abstract

The invention relates to a BiOBr0.2I0.8 / graphene composite visible-light-induced photocatalyst and a preparation method thereof and belongs to the field of photocatalysis technology. BiOBr0.2I0.8 is microspheres composed of a large quantity of nanoflakes; the microspheres are 1.0 mum in diameter and are uniformly distributed on graphene flakes; and the mass percent of graphene is 5.0-15.0%. Firstly, graphite oxide is ultrasonically dispersed in absolute ethyl alcohol to obtain a suspension of graphene oxide; secondly, while stirring, adding the suspension of graphene oxide to a certain amount of ethylene glycol solution of sodium bromide, potassium iodide and bismuth nitrate; thirdly, the suspension of graphene oxide is transferred into a high pressure reactor with a polytetrafluoroethylene liner to be subjected to crystallization reaction for 12-16 h at 160-180 degrees; and finally, the obtained solid product is filtered, washed and dried to obtain the BiOBr0.2I0.8 / graphene composite visible-light-induced photocatalyst.

Description

technical field [0001] The present invention relates to a kind of BiOBr 0.2 I 0.8 The invention discloses a graphene / graphene composite visible light catalyst and a preparation method thereof, belonging to the technical field of photocatalysis. Background technique [0002] In recent years, energy shortage and environmental pollution have increasingly become major issues threatening human survival and health. Photocatalytic technology is a new green environmental management technology that uses semiconductors as catalysts to degrade organic environmental pollutants using solar energy. It directly utilizes solar energy, does not need artificial energy, can completely mineralize various organic pollutants that are difficult to biodegrade, and has no secondary pollution, so it has a good application prospect. The current commercial photocatalyst is mainly TiO 2 , but TiO 2 Photocatalysts have a wide band gap (Eg = 3.2 eV), can only be excited by ultraviolet light in sunlig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/06
Inventor 刘红苏芸陈振靳智通
Owner SHANGHAI UNIV
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