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A biobr-based heterojunction with visible light catalytic activity and its preparation method

A catalytic activity, visible light technology, applied in the direction of illumination water/sewage treatment, etc., can solve the problems to be further improved, and achieve the effect of electron transfer and catalytic activity improvement, low cost, and simple preparation process.

Active Publication Date: 2016-04-20
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in the above patents only Bi 24 o 31 Cl 10 With visible light activity, BiOCl has a wide band gap (3.2eV), and can only absorb ultraviolet light, so it only transfers Bi 24 o 31 Cl 10 The role of photogenerated electrons, so the catalytic activity of the heterojunction needs to be further improved

Method used

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  • A biobr-based heterojunction with visible light catalytic activity and its preparation method
  • A biobr-based heterojunction with visible light catalytic activity and its preparation method
  • A biobr-based heterojunction with visible light catalytic activity and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Pure BiOBr was prepared as follows:

[0023] ①Mix 0.01mol of bismuth nitrate with 0.008mol of 2-bromoethylamine hydrobromide, 0.005mol of tetramethylammonium bromide and 0.003mol of urea, and heat to melt to form an ionic liquid;

[0024] ②Heating the ionic liquid described in step ① on an electric furnace until the ionic liquid burns, and the combustion produces a large amount of smoke and emits a large amount of heat;

[0025] ③Collect the solid produced after complete combustion in step ②, cool and grind to obtain a powder, which is designated as sample A.

[0026] Sample A was tested by XRD, UV-VisDRS and SEM respectively, and the test patterns were as follows Figure 1 to Figure 3 shown. figure 1 XRD patterns show that the powder is pure BiOBr. From figure 2 It can be seen from the figure that the pure BiOBr prepared in this example has absorption in the visible light region, using α(hν)=a(hν-E g ) 2 The formula calculates that its forbidden band width is ab...

Embodiment 2

[0029] Follow the steps below to prepare BiOBr / Bi 24 o 31 Br 10 Heterojunction:

[0030] ① Mix 0.01mol bismuth nitrate with 0.0060mol 2-bromoethylamine hydrobromide, 0.001mol tetraethylammonium bromide and 0.005mol urea and heat until melted to form an ionic liquid;

[0031] ②Heating the ionic liquid described in step ① on an electric furnace until the ionic liquid burns, and the combustion produces a large amount of smoke and emits a large amount of heat;

[0032] ③Collect the solid produced after complete combustion in step ②, cool and grind to obtain a powder, which is designated as sample B.

[0033] Carry out XRD and UV-VisDRS test to sample B, its pattern see respectively figure 1 and figure 2 ,use figure 1 Its peak intensity and BiOBr and Bi 24 o 31 Br 10 The RIR value can be calculated to get BiOBr and Bi 24 o 31 Br 10 The mass fractions were 91.8% and 8.2%, respectively. Depend on figure 2 Using α(hν)=a(hν-E g ) 2 The formula calculates that its forb...

Embodiment 3

[0036] Follow the steps below to prepare BiOBr / Bi 24 o 31 Br 10 Heterojunction:

[0037] ① Mix and heat 0.01mol bismuth nitrate, 0.0060mol 2-bromoethylamine hydrobromide and 0.008mol urea until melted to form an ionic liquid;

[0038] ②Heating the ionic liquid described in step ① on an electric furnace until the ionic liquid burns, and the combustion produces a large amount of smoke and emits a large amount of heat;

[0039] ③Collect the solid produced after complete combustion in step ②, cool and grind to obtain a powder, which is designated as sample C.

[0040] Carry out XRD and UV-VisDRS test to sample C, its pattern see respectively figure 1 and figure 2 ,use figure 1 Its peak intensity and BiOBr and Bi 24 o 31 Br 10 The RIR value can be calculated to get BiOBr and Bi 24 o 31 Br 10 The mass fractions were 85.2% and 14.8%, respectively. Depend on figure 2 Using α(hν)=a(hν-E g ) 2 The formula calculates that its forbidden band width is about 2.53eV.

[00...

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Abstract

The invention discloses a visible-light catalytic activity BiOBr-based heterojunction material which is prepared from BiOBr and Bi24O31Br10 at a mass ratio of (28%-100%):(0%-72%). A preparation method of the BiOBr-based heterojunction material comprises the following steps: (1) mixing bismuth nitrate, urea, and one or more than one of tetramethyl ammonium bromide, tetraethyl ammonium bromide, 2-bromoethylamine hydrobromide and 3-bromopropylamine hydrobromide at a mass ratio of 1:(0.1-1.0):(0.1-1.0) to obtain a mixture, and heating the mixture until melting so as to obtain an ionic liquid; (2) heating the ionic liquid obtained in the step (1) until burning; and (3) collecting a solid generated after complete burning in the step (2), and cooling and grinding the solid to obtain the BiOBr-based heterojunction material. The preparation method is simple without requiring complicated equipment, and is short in time, high in yield, low in cost and suitable for industrial large-batched production.

Description

technical field [0001] The invention relates to a method for synthesizing BiOBr-based heterojunction nanomaterials with visible light catalytic activity, and belongs to the field of material synthesis. Background technique [0002] With the increasingly serious environmental pollution and the increasing shortage of energy sources, the photocatalytic technology that can use sunlight has shown broad application prospects in the fields of efficient degradation of organic pollutants, photolysis of water to produce hydrogen, and solar cells. The development of highly efficient photocatalysts is a key factor in determining the feasibility of photocatalytic technologies. Nano-TiO 2 Since it was reported in 1972, it has been widely researched and applied due to its advantages of high efficiency, non-toxicity, good stability and low cost. However, the commonly used anatase TiO 2 The bandgap width is wide (3.2eV), and it can only absorb ultraviolet light below λ<387nm. This part...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/06C02F1/30
Inventor 李发堂王庆王晓静郝影娟刘瑞红
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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