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Bismuth compounded bismuth oxyiodide photocatalyst containing iodide ionic defects and preparation method of bismuth compounded bismuth oxyiodide photocatalyst

A technology of bismuth oxyiodide and photocatalyst, which is applied in the field of bismuth composite bismuth oxyiodide photocatalyst and its preparation, which can solve the problems of inability to change the transition excitation path of photogenerated electrons, inability to promote the transfer efficiency of photogenerated electrons, and low utilization rate of solar energy.

Inactive Publication Date: 2018-08-24
CHONGQING TECH & BUSINESS UNIV
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] However, the bismuth-based photocatalysts prepared by the prior art have low photon quantum conversion efficiency, narrow photoresponse range, and low utilization rate of solar energy (visible light), which hinder the application of photocatalytic technology.
The bismuth-based photocatalysts prepared in the prior art cannot build a defect intermediate energy level between the valence band and the conduction band, and cannot change the excitation path of the photo-generated electrons from the valence band to the conduction band transition, and thus cannot promote the improvement of the migration efficiency of the photo-generated electrons.

Method used

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  • Bismuth compounded bismuth oxyiodide photocatalyst containing iodide ionic defects and preparation method of bismuth compounded bismuth oxyiodide photocatalyst
  • Bismuth compounded bismuth oxyiodide photocatalyst containing iodide ionic defects and preparation method of bismuth compounded bismuth oxyiodide photocatalyst
  • Bismuth compounded bismuth oxyiodide photocatalyst containing iodide ionic defects and preparation method of bismuth compounded bismuth oxyiodide photocatalyst

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preparation example Construction

[0042] figure 1 A flow chart of a method for preparing a bismuth composite bismuth oxyiodide photocatalyst containing iodide ion defects shown in the embodiments of the present application, the method comprising:

[0043] S101, add deionized water to both beakers, drop bismuth nitrate pentahydrate and potassium iodide into the two beakers respectively, and magnetically stir bismuth nitrate pentahydrate and potassium iodide at room temperature to obtain bismuth nitrate pentahydrate solutions respectively and potassium iodide solution;

[0044] S102, under the condition of heating in a water bath, the potassium iodide solution is added dropwise to the bismuth nitrate pentahydrate solution, and the brick-red precipitate is obtained after the static precipitation is separated from the solution;

[0045] S103, centrifuging and washing the brick-red precipitate to obtain a first precipitate;

[0046] S104, drying the first precipitate to obtain a pure tetragonal bismuth oxyiodide ...

Embodiment 1

[0077] (1) Add bismuth nitrate pentahydrate and potassium iodide to a 50ml beaker containing 25mL deionized water and a 25ml beaker containing 10ml deionized water respectively, the molar ratio of the two additions is 1:1, and stir magnetically for 30 minutes at room temperature , obtain bismuth nitrate pentahydrate solution and potassium iodide solution respectively;

[0078] (2) Add the potassium iodide solution dropwise to the bismuth nitrate pentahydrate solution under the condition of heating in a water bath at 80°C, react for 2 hours, let the precipitation stand still and separate from the solution to obtain a brick-red precipitate;

[0079] (3) Washing the brick red precipitate with ethanol and deionized water respectively twice before and after each to obtain the first precipitate;

[0080] (4) Drying the first precipitate in an oven at 60° C. to obtain a pure tetragonal bismuth oxyiodide nanosheet photocatalyst.

[0081] The bismuth oxyiodide nanosheet photocatalyst ...

Embodiment 2

[0084] (1) Add bismuth nitrate pentahydrate and potassium iodide to a 50ml beaker containing 25mL deionized water and a 25ml beaker containing 10ml deionized water respectively, the molar ratio of the two additions is 1:1, and stir magnetically for 30 minutes at room temperature , obtain bismuth nitrate pentahydrate solution and potassium iodide solution respectively;

[0085] (2) Add the potassium iodide solution dropwise to the bismuth nitrate pentahydrate solution under the condition of heating in a water bath at 80°C, react for 2 hours, let the precipitation stand still and separate from the solution to obtain a brick-red precipitate;

[0086] (3) Washing the brick red precipitate with ethanol and deionized water respectively twice before and after each to obtain the first precipitate;

[0087] (4) drying the first precipitate in an oven at 60°C to obtain a pure tetragonal bismuth oxyiodide nanosheet photocatalyst;

[0088] (5) Weigh 0.70 gram of pure tetragonal bismuth o...

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Abstract

The invention discloses a bismuth compounded bismuth oxyiodide photocatalyst containing iodide ionic defects and a preparation method of the bismuth compounded bismuth oxyiodide photocatalyst. The bismuth compounded bismuth oxyiodide photocatalyst containing the iodide ionic defects is prepared through precipitation, centrifugal washing, magnetic stirring and other steps. According to the bismuthcompounded bismuth oxyiodide photocatalyst containing the iodide ionic defects and prepared with the method, a plurality of defect intermediate levels are formed between a valence band and a conduction band of the photocatalyst by constructing the iodide ionic defects, excitation and transmission paths of photo-induced electrons are changed, migration and transformation of photo-generated chargesare promoted, and recombination of photo-induced electron-hole pairs is inhibited. Visible light response range is enlarged, visible light utilization rate is increased, and finally, the NO removal rate of the prepared bismuth compounded bismuth oxyiodide photocatalyst containing the iodide ionic defects is increased. Besides, economic cost for producing the bismuth compounded bismuth oxyiodide photocatalyst containing the iodide ionic defects and prepared with the method is low.

Description

technical field [0001] The present application relates to the field of catalysts, in particular to a bismuth composite bismuth oxyiodide photocatalyst containing iodide ion defects and a preparation method thereof. Background technique [0002] With the advancement of human science and technology civilization, the industry has developed on a large scale, and automobiles have become more and more popular, and a large amount of nitrogen oxides have been discharged into the atmosphere. Nitrogen oxides are pollutants of photochemical smog, acid rain, and ozone layer destruction. Nitrogen oxides have become air pollutants that need to be solved urgently in countries all over the world. Visible light-driven photocatalysis, as an environmentally friendly green technology, has shown good application prospects in both environmental pollution purification and solar energy conversion. The photocatalytic method driven by visible light can oxidize nitrogen oxides under the action of pho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/06B01J37/10B01J37/03B01J37/16B01D53/94B01D53/56
CPCB01D53/9413B01J27/06B01J37/033B01J37/10B01J37/16B01J35/39
Inventor 董帆孙明禄雷奔李宇涵
Owner CHONGQING TECH & BUSINESS UNIV
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