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BiOCl/Bi12O17Cl2@AgCl heterojunction visible-light photocatalyst, and preparation method and application thereof

A bi12o17cl2, heterojunction technology, applied in the field of photocatalysis, can solve the problems of reduced semiconductor band gap, low Cl/O ratio, enhanced visible light utilization ability, etc., to increase surface active sites, improve visible light catalytic activity, Effects of enhancing visible light absorption ability and photocatalytic activity and photochemical stability

Inactive Publication Date: 2017-07-14
CHONGQING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Recently, studies have shown that the lower the Cl / O ratio, the lower the bottom of the valence band of the semiconductor, which leads to a reduction in the semiconductor band gap and an enhanced ability to utilize visible light.

Method used

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  • BiOCl/Bi12O17Cl2@AgCl heterojunction visible-light photocatalyst, and preparation method and application thereof
  • BiOCl/Bi12O17Cl2@AgCl heterojunction visible-light photocatalyst, and preparation method and application thereof
  • BiOCl/Bi12O17Cl2@AgCl heterojunction visible-light photocatalyst, and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0060] 1.33g BiCl 3 The crystals were placed in 50 mL of absolute ethanol and stirred vigorously for 30 min, and then added to BiCl 3 12.6 mL of NaOH solution with a molar concentration of 2 mol / L was added dropwise to the absolute ethanol solution, and the stirring was continued for 4; the solution was centrifuged and washed, and the obtained product was dried at 60° C. for 10 h to obtain BiOCl / Bi 12 o 17 Cl 2 Binary heterojunction photocatalysts.

[0061] For the BiOCl / Bi 12 o 17 Cl 2 XRD analysis of the binary heterojunction photocatalyst, the results are as follows figure 1 As shown, the results show that the BiOCl / Bi 12 o 17 Cl 2 Binary heterojunction photocatalyst with BiOCl and Bi 12 o 17 Cl 2 Two crystal phases exist.

[0062] The BiOCl / Bi that the present invention will obtain 12 o 17 Cl 2 The binary heterojunction photocatalyst is used to remove NO, and the specific process is as follows: under the condition that the relative humidity is 70% and the o...

Embodiment 2

[0064] 1.33g BiCl 3 Crystals were placed in 30mL of absolute ethanol and vigorously stirred for 30min, and then added to BiCl 3 12.6 mL of NaOH solution with a molar concentration of 2 mol / L was added dropwise to the absolute ethanol solution, and the stirring was continued for 4 hours; the solution was centrifuged and washed, and the obtained product was dried at 60°C for 10 hours to obtain BiOCl / Bi 12 o 17 Cl 2 Binary heterojunction photocatalysts.

[0065] For the BiOCl / Bi 12 o 17 Cl 2 The binary heterojunction photocatalyst was analyzed by UV-vis DRS, the results are as follows figure 2 As shown, the results show that the BiOCl / Bi prepared in this example 12 o 17 Cl 2 The binary heterojunction photocatalyst has a forbidden band width of 2.06eV and has a large absorption of visible light.

[0066] The BiOCl / Bi that the present invention will obtain 12 o 17 Cl 2 The binary heterojunction photocatalyst is used to remove NO, and the specific process is as follows...

Embodiment 3

[0068] 1.33g BiCl 3 The crystals were placed in 50 mL of absolute ethanol and vigorously stirred for 30 min, and then added to BiCl 3 12.6 mL of NaOH solution with a molar concentration of 3 mol / L was added dropwise to the absolute ethanol solution, and the stirring was continued for 6 h; the solution was centrifuged and washed, and the obtained product was dried at 60° C. for 10 h to obtain BiOCl / Bi 12 o 17 Cl 2 Binary heterojunction photocatalysts.

[0069] For the BiOCl / Bi 12 o 17 Cl 2 The binary heterojunction photocatalyst was analyzed by SEM, the results are as follows image 3 As shown, the results show that the BiOCl / Bi prepared in this example 12 o 17 Cl 2 It is an irregular morphology structure formed by stacking two-dimensional nanosheets, and the thickness of the nanosheets is about 10.0nm to 50nm.

[0070] The BiOCl / Bi that the present invention will obtain 12 o 17 Cl 2 The binary heterojunction photocatalyst is used to remove NO, and the specific pro...

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Abstract

The invention belongs to the technical field of photocatalysis, and specifically relates to a BiOCl / Bi12O17Cl2@AgCl heterojunction visible-light photocatalyst, and a preparation method and an application thereof. According to the invention, a BiOCl / Bi12O17Cl2@AgCl ternary heterojunction visible-light photocatalyst is obtained with a BiOCl / Bi12O17Cl2 binary heterojunction as a template by depositing AgCl nanoparticles onto the surface of the BiOCl / Bi12O17Cl2 binary heterojunction. Through in-situ regulation to energy band structure and electronic structure of BiOCl, Bi12O17Cl2 and AgCl, the visible light absorption capacity of constructed heterojunction generates significant enhancement phenomenon; meanwhile, the BiOCl / Bi12O17Cl2@AgCl provided by the invention has high visible-light photocatalytic oxynitride removal activity and good photochemical stability. In addition, the preparation method provided by the invention has the advantages of mild conditions, simple operation and facilitation of large-scale production.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, in particular to a BiOCl / Bi 12 o 17 Cl 2 @AgCl heterojunction visible light catalyst and its preparation method and application. Background technique [0002] At present, human beings are facing two severe challenges of environmental pollution and energy shortage. How to efficiently use sustainable and clean solar energy to solve global environmental and energy problems is an important research direction in today's world. As a new type of efficient and environmentally friendly technology, photocatalytic technology has shown great application prospects in the fields of environmental purification and solar energy conversion. In terms of environmental purification, photocatalytic technology can use solar energy to mineralize or degrade various organic or inorganic pollutants in the environment; in terms of solar energy conversion, photocatalytic technology can convert low-density light ene...

Claims

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Application Information

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IPC IPC(8): B01J27/10B01D53/86B01D53/56A01N59/16A01P1/00A01P3/00
CPCB01D53/8628A01N59/16B01J27/10B01D2257/404B01J35/39
Inventor 张文东
Owner CHONGQING NORMAL UNIVERSITY
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