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Preparation method of BiOBrxI1-x/ZIF-8 composite photocatalyst

A ZIF-8, composite light technology, applied in organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as environmental pollution, complex methods, and difficult recycling , to achieve the effect of simple and safe preparation method, short preparation time and easy to put into production

Active Publication Date: 2020-11-10
XINXIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing method for preparing bismuth oxyhalide has the problems of complex method, difficult recovery and easy pollution to the environment

Method used

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  • Preparation method of BiOBrxI1-x/ZIF-8 composite photocatalyst
  • Preparation method of BiOBrxI1-x/ZIF-8 composite photocatalyst
  • Preparation method of BiOBrxI1-x/ZIF-8 composite photocatalyst

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Experimental program
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Effect test

Embodiment 1

[0030] A BiOBr x I 1-x The preparation method of / ZIF-8 composite photocatalyst comprises the following steps:

[0031] (1) The mixed solution of soluble zinc salt, 2-methylimidazole and methanol is subjected to solvothermal reaction to deprotonate 2-methylimidazole and self-assemble with zinc ions to form ZIF-8, filter, wash and dry, and grind to obtain ZIF -8 powder; the mol ratio of the soluble zinc salt and the 2-methylimidazole is 1:1.5; the mass ratio of the soluble zinc salt and methanol is 1:80; the soluble zinc salt includes Zinc acetate dihydrate; the temperature of the solvothermal reaction is 130°C, and the time is 12h;

[0032] (2) At room temperature, dissolve the halide in ethylene glycol to obtain solution A; mix ethylene glycol with bismuth nitrate to obtain solution B, and slowly add solution B to solution A under magnetic stirring; after stirring for 1 h , transfer the mixed solution to a polytetrafluoroethylene-lined autoclave, and conduct a crystallizati...

Embodiment 2

[0037] A BiOBr x I 1-x The preparation method of / ZIF-8 composite photocatalyst comprises the following steps:

[0038] (1) The mixed solution of soluble zinc salt, 2-methylimidazole and methanol is subjected to solvothermal reaction to deprotonate 2-methylimidazole and self-assemble with zinc ions to form ZIF-8, filter, wash and dry, and grind to obtain ZIF -8 powder; the mol ratio of the soluble zinc salt and the 2-methylimidazole is 1:2.5; the mass ratio of the soluble zinc salt and methanol is 1:100; the soluble zinc salt is Zinc nitrate hexahydrate; the temperature of the solvothermal reaction is 160°C, and the time is 28h;

[0039](2) At room temperature, dissolve the halide in ethylene glycol to obtain solution A; mix ethylene glycol with bismuth nitrate to obtain solution B, and slowly add solution B to solution A under magnetic stirring; after stirring for 5 hours , transfer the mixed solution to a polytetrafluoroethylene-lined autoclave, and conduct a crystallizati...

Embodiment 3

[0044] A BiOBr x I 1-x The preparation method of / ZIF-8 composite photocatalyst comprises the following steps:

[0045] (1) The mixed solution of soluble zinc salt, 2-methylimidazole and methanol is subjected to solvothermal reaction to deprotonate 2-methylimidazole and self-assemble with zinc ions to form ZIF-8, filter, wash and dry, and grind to obtain ZIF -8 powder; the mol ratio of the soluble zinc salt and the 2-methylimidazole is 1:1.8; the mass ratio of the soluble zinc salt and methanol is 1:89; the soluble zinc salt is Zinc chloride; the temperature of the solvothermal reaction is 150°C, and the time is 18h;

[0046] (2) At room temperature, dissolve the halide in ethylene glycol to obtain solution A; mix ethylene glycol with bismuth nitrate to obtain solution B, and slowly add solution B to solution A under magnetic stirring; after stirring for 4 hours , transfer the mixed solution to a polytetrafluoroethylene-lined autoclave, and conduct a crystallization reaction...

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Abstract

The invention relates to a preparation method of a BiOBrxI1-x / ZIF-8 composite photocatalyst. The preparation method comprises the following steps: carrying out solvothermal reaction on a mixed solution of soluble zinc salt, 2-methylimidazole and methanol; dissolving halide in ethylene glycol to obtain a solution A; mixing ethylene glycol and bismuth nitrate to obtain a solution B, and slowly adding the solution B into the solution A under magnetic stirring to obtain a bismuth oxyhalide source; dropwise adding deionized water into a mixed solution of an organic solvent, an acidic pH regulator and a bismuth oxyhalide source, and performing stirring to obtain a first solution; and concentrating and adding ZIF-8 powder to obtain the BiOBrxI1-x / ZIF-8 composite photocatalyst. The catalyst prepared by the invention can be recycled, and has no pollution to the environment; the preparation time is short and large-scale production can be achieved. In the research process, the condensed state physical subsidy of the ninth batch of key disciplines in Henan Province with the project number of 1333010223 is obtained.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a BiOBr x I 1-x / ZIF-8 composite photocatalyst preparation method. Background technique [0002] Semiconductor photocatalyst technology can be used to degrade organic wastewater, reduce heavy metal ions, purify air, sterilize, and prevent fog. At present, photocatalysts represented by titanium dioxide have been widely used in environmental pollution control and other aspects. Unfortunately, titanium dioxide has a large band gap and can only use the ultraviolet components in sunlight, so the utilization rate of sunlight is low. Bismuth oxyhalide (BiOBr x I 1-x / ZIF-8) as a photocatalyst with tunable bandgap, can utilize visible light to ultraviolet light in sunlight, which is environmentally friendly and efficient. And when it reacts, it shows good photostability and high reactivity, is non-toxic, and has no secondary pollution. It is a photocatalyst material with the broa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/26B01J31/22B01J35/10C02F1/30C02F101/38
CPCB01J31/26B01J31/1691B01J31/1815C02F1/30B01J2531/26C02F2305/10C02F2101/38B01J35/39B01J35/61Y02W10/37
Inventor 郭笑天苏芸陈秀宇武彬彬王斌孙贝贝王桐语刘超宋孟祺
Owner XINXIANG UNIV
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