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Nitrogen/sulfur-doped bismuth oxyhalide visible light catalysis material and preparation method thereof

A technology of bismuth oxyhalide and catalytic materials, which is applied in the field of nitrogen/sulfur doped bismuth oxyhalide visible light catalytic materials and its preparation, can solve the problem that the visible light degradation ability of bismuth oxyhalide cannot meet the actual needs, and bismuth oxyhalide has no mature preparation method, low utilization rate of sunlight, etc., to achieve good application prospects, improved photocatalytic performance, simple and efficient reaction process

Inactive Publication Date: 2015-10-14
杭州臣工医用空气净化技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Titanium dioxide has become an ideal photocatalyst due to its non-toxicity, good chemical stability, strong oxidation ability, and no secondary pollution. It only accounts for 4% to 6%, and the utilization rate of sunlight is low
However, the visible light degradation ability of pure bismuth oxyhalide cannot meet the actual needs, so it is necessary to modify bismuth oxyhalide to improve its photocatalytic efficiency
[0006] Doping is an effective method to improve the catalytic activity of bismuth oxyhalide. At present, metal element doping is mostly used to improve its photocatalytic ability, but the cost of metal element doping is high, and non-metal element doping bismuth oxyhalide has not yet mature preparation method

Method used

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  • Nitrogen/sulfur-doped bismuth oxyhalide visible light catalysis material and preparation method thereof
  • Nitrogen/sulfur-doped bismuth oxyhalide visible light catalysis material and preparation method thereof
  • Nitrogen/sulfur-doped bismuth oxyhalide visible light catalysis material and preparation method thereof

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Embodiment 1

[0047] A method for preparing a nitrogen / sulfur-doped bismuth oxyhalide visible light catalytic material, comprising the following steps:

[0048] (1) Pour 60 milliliters of ethylene glycol methyl ether into a 100 milliliter beaker, then add 0.6 gram of bismuth nitrate, 0.5 gram of urea, 0.05 gram of thiourea and 1.2 gram of cetyl ammonium bromide, ultrasonically dissolve to obtain the first mixture;

[0049] (2) Transfer the first mixed solution to a polytetrafluoroethylene-lined autoclave, react in an oil bath at 180°C for 24 hours, take out the reactant after cooling, and centrifuge three times with deionized water and ethanol, collect The precipitate was vacuum-dried at 60°C for 12 hours to prepare a nitrogen / sulfur-doped bismuth oxybromide microsphere catalyst.

Embodiment 2

[0051]Using 0.2 g of urea as a non-metallic dopant source, the nitrogen / sulfur doped bismuth oxybromide microsphere catalyst was prepared in the same manner as in Example 1.

Embodiment 3～5

[0053] Respectively with 0.2 gram of thiourea+0.01 gram of urea, 0.05 gram of thiourea+0.2 gram of urea, 0.5 gram of thiourea+0 gram of urea instead of 0.2 gram of urea as non-metallic doping source, adopt the method identical with embodiment 1 to prepare nitrogen / Sulfur-doped bismuth oxybromide microsphere catalyst.

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Abstract

The invention discloses a nitrogen / sulfur-doped bismuth oxyhalide visible light catalysis material and a preparation method thereof. The preparation method comprises the following steps: (1) adding a salt containing bismuth ions, a nonmetal doping source and a halide in a mol ratio of 0.1-1: 0.1-30: 0.1-20 into an organic solvent and carrying out full dissolving so as to obtain a first mixed solution; and (2) transferring the first mixed solution to a high pressure reactor, carrying out a reaction in an oil bath with a temperature of 180 DEG C for 10 to 48 h, cooling the solution, taking a precipitate and subjecting the precipitate to washing and drying so as to obtain the nitrogen / sulfur-doped bismuth oxyhalide visible light catalysis material; wherein the nonmetal doping source is at least one selected from the group consisting of urea and thiourea. According to the invention, urea or thiourea is used as the nonmetal doping source, and bismuth oxyhalide is doped by using a solvothermal method; thus, the nitrogen / sulfur-doped bismuth oxyhalide visible light catalysis material with high catalytic activity is prepared, and photocatalytic activity of the material is increased by 80% compared with conventional bismuth oxyhalide.

Description

technical field [0001] The invention relates to a bismuth oxyhalide visible light catalytic material, in particular to a nitrogen / sulfur doped bismuth oxyhalide visible light catalytic material and a preparation method thereof. Background technique [0002] With the acceleration of industrialization and urbanization, environmental pollution control has become an urgent task. At present, many technologies such as photocatalytic degradation, biodegradation, electrolysis and precipitation are effective means commonly used to decompose pollutants and control environmental pollution. [0003] Photocatalytic reactions use semiconductor photocatalysts to generate photogenerated electrons and holes under light, further triggering a series of oxidation and reduction reactions, which have the advantages of energy saving and environmental friendliness, and have broad applications in the degradation of organic pollutants and selective oxidation reactions. application prospects. Titani...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24
Inventor 陈涛
Owner 杭州臣工医用空气净化技术有限公司