Preparation method of photocatalyst capable of degrading dyestuff wastewater

A technology for dye wastewater and composite catalysts, which is applied in chemical instruments and methods, physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, etc., to achieve improved utilization, easy control of reaction conditions, and high purification efficiency. Effect

Pending Publication Date: 2018-08-03
牛笑天
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there have been researches on the ability of ionic liquids to enhance the activity of catalysts for photolysis of water to produce hydrogen, but there are few reports on the preparation of ionic liquids on suitable carriers for the preparation of catalysts with excellent photocatalytic degradation of dye wastewater.

Method used

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  • Preparation method of photocatalyst capable of degrading dyestuff wastewater

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Embodiment 1

[0031] Example 1 Preparation of perovskite-wrapped hydrotalcite-like substrate

[0032] Specifically include the following steps:

[0033] a. Prepare Mg(NO 3 ) 2 and Al(NO3 ) 3 A mixed aqueous solution, wherein the mol ratio of Mg to Al is: 3, wherein the concentration of the mixed aqueous solution is 0.4mol / L;

[0034] b. Under the stirring condition of 150-300 rpm / min, to Na 2 CO 3 Add the mixed aqueous solution prepared in step a dropwise to the aqueous solution, and drop it for 1 hour. During the dropwise addition, Na 2 CO 3 The volume ratio of the aqueous solution and the mixed aqueous solution prepared in step a is 1:4, and after the dropwise addition is completed, use Na 2 CO 3 Adjust the pH value of the system to 10 with the aqueous solution, and maintain the aging at 80°C for 12 hours;

[0035] c. Suction filter the precipitate prepared in step b, wash it with deionized water, and then dry it at 100°C for 6h, then calcinate it in an air atmosphere at 800°C fo...

Embodiment 2

[0038] The preparation of embodiment 2 ionic liquid

[0039] Dissolve 3-bromopropylamine hydrobromide in anhydrous acetonitrile, add 1-methylimidazole, heat up to 55°C for reaction, the time from the start of temperature rise to the end of the reaction is 24h, remove the solvent, and use methanol with a volume ratio of 1:1 Wash with a mixed solution of diethyl ether, remove methanol and diethyl ether by rotary evaporation, dissolve the residue in methanol, add saturated NaOH methanol solution dropwise until the pH value of the solution reaches 8.5, remove methanol by rotary evaporation, and centrifuge to separate inorganic salts from hexafluoro Ammonium phosphate was reacted for 1 h, and the orange-red 1-methyl-3 aminopropylimidazolium hexafluorophosphate ionic liquid was obtained by silica gel column chromatography, which was stored at 4°C for later use. Wherein, the molar ratio of 3-bromopropylamine hydrobromide, 1-methylimidazole, and ammonium hexafluorophosphate is 4:1:3. ...

Embodiment 3

[0040] Example 3 Ionic liquid-modified perovskite-coated hydrotalcite-like photocatalyst

[0041] f. In an ice bath and nitrogen atmosphere, take a certain amount of methanol solution of orange-red 1-methyl-3 aminopropylimidazolium hexafluorophosphate ionic liquid, then add perovskite-coated hydrotalcite-like substrate to it, and stir the reaction 2h. The solvent was removed by rotary evaporation of the reaction product to obtain a light yellow powder, which is a perovskite-coated hydrotalcite-like catalyst modified by ionic liquids. The mass ratio of 1-methyl-3 aminopropylimidazolium hexafluorophosphate ionic liquid to perovskite-wrapped hydrotalcite substrate is 1:25.

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Abstract

The invention provides a treatment technology for degrading dyestuff wastewater through photocatalysis. A visible light catalyst adopted by the treatment technology is an ion liquid modified perovskite covered hydrotalcite photocatalyst. The catalyst takes perovskite covered hydrotalcite with photocatalysis activity as a substrate; the visible light utilization rate of the substrate can be improved and ionic liquid can be used for improving the photocatalysis activity; the ionic liquid is 1-methyl-3-aminopropylhexafluorophosphate. By adopting the treatment technology provided by the invention,the problem in the prior art that the degradation efficiency of the dyestuff wastewater is low is solved and the treatment technology is suitable for degrading organic dyestuffs in a polluted water body.

Description

technical field [0001] The invention relates to a treatment process for photocatalytically degrading dye wastewater. The perovskite-coated hydrotalcite-like photocatalyst modified by ionic liquid is used. The treatment process has the advantages of simple operation, low cost, high degradation efficiency, and the like. Background technique [0002] Industrial development is inseparable from the use of dyes, which are widely used in many fields such as textiles, papermaking, printing, food, pharmaceuticals, copying and printing. There are about 100,000 kinds of industrial dyes in the world, with an annual output of about 1 million tons. The industrial wastewater produced by dyes is one of the main pollutions of water bodies at present. About 60,000 tons of dyes are discharged into the environment with wastewater every year in the world. my country is a big country in the production and export of dyestuffs, ranking first in the world in both production volume and export volume...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/02C02F1/30C02F101/34C02F101/38
CPCB01J31/0294B01J35/004C02F1/30C02F2101/308C02F2101/34C02F2101/38C02F2101/40C02F2305/10
Inventor 牛笑天
Owner 牛笑天
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