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Visible-light catalytic activity BiOBr-based heterojunction and preparation method thereof

A catalytic activity, heterojunction technology, applied in the direction of chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve problems that need to be further improved, and achieve the transfer of electrons and the improvement of catalytic activity. Effect of photocatalytic activity and quantum efficiency improvement

Active Publication Date: 2014-12-10
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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  • Visible-light catalytic activity BiOBr-based heterojunction and preparation method thereof
  • Visible-light catalytic activity BiOBr-based heterojunction and preparation method thereof
  • Visible-light catalytic activity BiOBr-based heterojunction and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Pure BiOBr was prepared as follows:

[0023] ① Mix 0.01 mol of bismuth nitrate with 0.008 mol of 2-bromoethylamine hydrobromide, 0.005 mol of tetramethylammonium bromide and 0.003 mol 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-Vis DRS 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 that the pure BiOBr prepared in this example has absorption in the visible light region, and the use of α (h ν )=a(h ν -E g ) 2 The formula calculates that its forbidden band w...

Embodiment 2

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

[0030] ① Mix 0.01 mol of bismuth nitrate with 0.0060 mol of 2-bromoethylamine hydrobromide, 0.001 mol of tetraethylammonium bromide and 0.005 mol of 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-Vis DRS 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 use α (h ν )=a(h ν -E g ) 2 The formul...

Embodiment 3

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

[0037] ① Mix 0.01 mol of bismuth nitrate with 0.0060 mol of 2-bromoethylamine hydrobromide and 0.008 mol of urea and heat 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-Vis DRS 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 use α (h ν )=a(h ν -E g ) 2 The formula calculates that its forbidden band widt...

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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 (3.2 eV), and it can only absorb ultraviolet light below λ<387 nm. This pa...

Claims

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Application Information

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Patent Type & Authority Applications(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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