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Ferric oxide/bismuth oxybromide composite material and preparation method and application thereof

A technology of bismuth oxybromide and composite materials, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve the problem of easy recombination of visible light absorption efficiency, easy recombination of photogenerated electrons and holes, and unfavorable complexes. Photocatalytic performance and other problems, to overcome the low photoelectric conversion efficiency, improved photocatalytic performance, and superior photocatalytic performance.

Inactive Publication Date: 2016-02-24
SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most semiconductors have the following two problems: 1) the band gap is too wide, and the response to visible light is poor; 2) the response to visible light is good, but the photogenerated electrons-holes are easy to recombine
[0004] BiOBr is a new type of visible light catalyst, but the photogenerated electrons and holes of pure iron oxide and BiOBr are easy to recombine and the absorption efficiency of visible light is low, which is not conducive to improving the photocatalytic performance of the composite.
So far, the one-step hydrothermal synthesis of iron oxide / bismuth oxybromide (Fe 2 o 3 / BiOBr) composites have not been reported yet, therefore, to develop and provide a Fe with simple preparation process and excellent performance 2 o 3 / BiOBr composite material is very necessary

Method used

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  • Ferric oxide/bismuth oxybromide composite material and preparation method and application thereof
  • Ferric oxide/bismuth oxybromide composite material and preparation method and application thereof
  • Ferric oxide/bismuth oxybromide composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A preparation method of iron oxide / bismuth oxybromide composite material, comprising the following steps:

[0038] (1) the sodium hydroxide that takes by weighing 0.48g is dissolved in the water of 10mL and is made into the sodium hydroxide solution that concentration is 1.2mol / L, and the ferric nitrate nonahydrate that takes 1.616g is dissolved in the water of 90mL and makes ferric nitrate solution; Then add 10 mL of 1.2 mol / L sodium hydroxide solution into the ferric nitrate solution to obtain a 0.04 mol / L ferric hydroxide colloidal solution.

[0039] (2) Weigh 0.97g bismuth nitrate pentahydrate and disperse it in 25mL water to make bismuth nitrate solution, weigh 0.238gKBr and dissolve it in 10mL water to make KBr solution; then add 10mLKBr solution to the bismuth nitrate solution and stir for half an hour , to obtain a mixed solution, the pH value of the mixed solution is 1-2.

[0040] (3) Add 5mL of ferric hydroxide colloidal solution in step (1) to the mixed solu...

Embodiment 2

[0042] A preparation method of iron oxide / bismuth oxybromide composite material, comprising the following steps:

[0043] (1) the sodium hydroxide that takes by weighing 0.48g is dissolved in the water of 10mL and is made into the sodium hydroxide solution that concentration is 1.2mol / L, and the ferric nitrate nonahydrate that takes 1.616g is dissolved in the water of 90mL and makes ferric nitrate solution; Then add 10 mL of 1.2 mol / L sodium hydroxide solution into the ferric nitrate solution to obtain a 0.04 mol / L ferric hydroxide colloidal solution.

[0044] (2) Weigh 0.97g bismuth nitrate pentahydrate and disperse it in 25mL water to make bismuth nitrate solution, weigh 0.238gKBr and dissolve it in 10mL water to make KBr solution; then add 10mLKBr solution to the bismuth nitrate solution and stir for half an hour , to obtain a mixed solution, the pH value of the mixed solution is 1-2.

[0045] (3) Add 10mL of ferric hydroxide colloidal solution in step (1) to the mixed sol...

Embodiment 3

[0050] A preparation method of iron oxide / bismuth oxybromide composite material, comprising the following steps:

[0051] (1) the sodium hydroxide that takes by weighing 0.48g is dissolved in the water of 10mL and is made into the sodium hydroxide solution that concentration is 1.2mol / L, and the ferric nitrate nonahydrate that takes 1.616g is dissolved in the water of 90mL and makes ferric nitrate solution; Then add 10 mL of 1.2 mol / L sodium hydroxide solution into the ferric nitrate solution to obtain a 0.04 mol / L ferric hydroxide colloidal solution.

[0052] (2) Weigh 0.97g bismuth nitrate pentahydrate and disperse it in 25mL water to make bismuth nitrate solution, weigh 0.238gKBr and dissolve it in 10mL water to make KBr solution; then add 10mLKBr solution to the bismuth nitrate solution and stir for half an hour , to obtain a mixed solution, the pH value of the mixed solution is 1-2.

[0053] (3) Add 15mL of ferric hydroxide colloidal solution in step (1) to the mixed sol...

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Abstract

The invention belongs to the technical field of preparation of composite materials and discloses a ferric oxide / bismuth oxybromide composite material and a preparation method and application thereof. The ferric oxide / bismuth oxybromide composite material is formed by ferric oxide nano-clusters depositing on the surfaces of bismuth oxybromide nano-sheets. The preparation method comprises the steps of adding an alkali solution into a ferric nitrate solution to obtain a ferric hydroxide colloidal solution, adding a KBr solution into a bismuth nitrate solution, performing mixing to obtain a mixed solution, dropwise adding the ferric hydroxide colloidal solution into the mixed solution and performing hydrothermal reaction to obtain the ferric oxide / bismuth oxybromide composite material. The preparation method has the advantages of being simple in preparation process and low in cost, having very good environmental protection benefits and the like, the prepared composite material has excellent photocatalytic performance and is widely applied to the field of photocatalytic degradation of dye wastewater, and the higher catalytic efficiency can be obtained.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, and relates to a preparation method and application of a photocatalytic composite material, in particular to an iron oxide / bismuth oxybromide composite material, a preparation method and application thereof. Background technique [0002] At present, the large-scale application of organic dyes produces a large amount of toxic industrial wastewater, which will have a serious impact on the ecological environment if it is directly discharged into the water body without proper treatment. Moreover, some dyes are also potentially carcinogenic, and will directly endanger the health of humans and animals after entering the food chain. Traditionally, physical-chemical methods, electrochemical methods, biological methods, etc. have been used to treat dye wastewater. However, it has the disadvantages of low removal efficiency, secondary pollution and high cost. Considering the enviro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/128C02F1/30
CPCY02W10/37
Inventor 黄大伟温小菊牛承岗虢清伟邴永鑫崔恺张政科林健聪
Owner SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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