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Iodine-doped nano-Bi4O5Br2 visible-light-induced photocatalyst, preparation method and application thereof

A bi4o5br2, visible light technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve problems such as the limitation of separation efficiency of photogenerated electron-hole pairs, and achieve easy recycling and reuse, and easy availability of raw materials. , the effect of low energy consumption

Active Publication Date: 2017-11-03
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pure phase Bi 4 o 5 Br 2 Although it has good photocatalytic activity, its separation efficiency of photogenerated electron-hole pairs is still limited. Therefore, the development of Bi with narrower band system and higher photogenerated carrier separation efficiency 4 o 5 Br 2 Based catalysts are still a challenging job

Method used

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  • Iodine-doped nano-Bi4O5Br2 visible-light-induced photocatalyst, preparation method and application thereof
  • Iodine-doped nano-Bi4O5Br2 visible-light-induced photocatalyst, preparation method and application thereof
  • Iodine-doped nano-Bi4O5Br2 visible-light-induced photocatalyst, preparation method and application thereof

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Effect test

Embodiment 1

[0029] The preparation method of iodine-doped nanometer visible light catalyst comprises the steps:

[0030] 1) Weigh 1mmol bismuth nitrate and dissolve it in 50mL ethylene glycol, stir to obtain solution A;

[0031] 2) Add 0.5 mmol of potassium bromide to solution A to obtain mixed solution B;

[0032] 3) Add 0.35 mmol potassium iodide to the mixed solution B obtained in step 2), stir and dissolve fully to obtain solution C;

[0033] 4) Put the mixed solution C obtained in step 3) into a microwave reactor and react with 400W power for 4 minutes;

[0034]5) After the microwave reaction mixture was cooled to room temperature, the precipitate was taken out and washed with deionized water and ethanol for 2 to 3 times, and then dried at 60°C for 12 hours to obtain iodine-doped Bi 4 o 5 Br 2 visible light catalyst.

[0035] The resulting I-doped Bi 4 o 5 Br 2 Visible photocatalysts were characterized by XRD, SEM-EDS, and DRS, and the results are shown in Figures 1 to 3 sh...

Embodiment 2

[0039] The preparation method of iodine-doped nanometer visible light catalyst comprises the steps:

[0040] 1) Weigh 5mmol bismuth nitrate and dissolve it in 50mL ethylene glycol, stir to obtain solution A;

[0041] 2) Add 2.5 mmol of potassium bromide to solution A to obtain mixed solution B;

[0042] 3) Add 5 mmol potassium iodide to the mixed solution B obtained in step 2), stir and dissolve fully to obtain solution C;

[0043] 4) Put the mixed solution C obtained in step 3) into a microwave reactor and react with 400W power for 8 minutes;

[0044] 5) After the microwave reaction mixture was cooled to room temperature, the precipitate was taken out and washed with deionized water and ethanol for 2 to 3 times, and then dried at 100°C for 4 hours to obtain iodine-doped Bi 4 o 5 Br 2 visible light catalyst.

[0045] Use the iodine doped Bi of the present invention 4 o 5 Br 2 The degradation test of butylparaben and bisphenol A under visible light irradiation shows tha...

Embodiment 3

[0047] The preparation method of iodine-doped nanometer visible light catalyst comprises the steps:

[0048] 1) Weigh 1mmol bismuth nitrate and dissolve it in 50mL ethylene glycol, stir to obtain solution A;

[0049] 2) Add 0.5 mmol of potassium bromide to solution A to obtain mixed solution B;

[0050] 3) Add 0.1 mmol potassium iodide to the mixed solution B obtained in step 2), stir and dissolve fully to obtain solution C;

[0051] 4) Put the mixed solution C obtained in step 3) into a microwave reactor and react with 200W power for 10 minutes;

[0052] 5) After the microwave reaction mixture was cooled to room temperature, the precipitate was taken out and washed with deionized water and ethanol for 2 to 3 times, and then dried at 60°C for 12 hours to obtain iodine-doped Bi 4 o 5 Br 2 visible light catalyst.

[0053] Use the iodine doped Bi of the present invention 4 o 5 Br 2 The degradation test of butylparaben and bisphenol A under visible light irradiation shows ...

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Abstract

The invention discloses a preparation method of an iodine-doped nano-Bi4O5Br2 visible-light-induced photocatalyst. The preparation method includes the following steps that 1, bismuth salt is dissolved in polyhydric alcohols, wherein the molar concentration of Bi<3+> in a solution A is 0.02-0.1 mol / L; 2, bromine salt is added into the solution A, wherein the molar ratio of Bi<3+> in a solution B to Br- is 2 to 1; 3, iodized salt is added into the solution B, wherein the molar ratio of I in a solution C to Br- is 0.2-2 to 1; 4, the solution C is put into a microwave reactor for microwave reaction for 2-10 minutes, wherein the power of the microwave reactor is 200-800 W; 5, a reaction product is subjected to cooling and drying treatment, the iodine-doped nano visible-light-induced photocatalyst is obtained. The Bi4O5Br2 is subjected to iodine-doped modification to prepare the novel visible-light-induced photocatalyst having stronger visible-light response capability so that sunlight can be better utilized in actual industrial life to efficiently degrade organic pollutants in the environment.

Description

Technical field: [0001] The invention belongs to the field of semiconductor photocatalytic materials, in particular to an iodine-doped nano Bi 4 o 5 Br 2 Visible light catalyst, preparation method and application. Background technique: [0002] In the past many years, semiconductor photocatalysts have received extensive attention due to their potential applications in solar energy conversion and environmental purification. Many semiconductors, such as TiO 2 , because of its stable chemical properties, high photostability, high photosensitivity, non-toxicity, low price, and chemical friendliness, it has been widely used in photocatalysis and photoelectrochemistry. However, this semiconductor photocatalyst has a wide band gap, only responds to the ultraviolet light field and has a low photon quantum efficiency, and in sunlight, ultraviolet light only accounts for 4%, which severely limits the application of photocatalytic technology in practical industries and Large-scale...

Claims

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Application Information

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IPC IPC(8): B01J27/06A62D3/30A62D101/28
CPCA62D3/30B01J27/06A62D2101/28B01J35/39
Inventor 肖信卢明莉南俊民左晓希
Owner SOUTH CHINA NORMAL UNIVERSITY
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