Treatment technology for photocatalytically degrading dyestuff wastewater

A technology of dye wastewater and treatment process, which is applied in the direction of special compound water treatment, light water/sewage treatment, water/sewage treatment, etc., to achieve the effect of simple operation, improved activity, and improved photocatalytic degradation activity

Pending Publication Date: 2018-08-24
牛笑天
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  • Summary
  • 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 a

Method used

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  • Treatment technology for photocatalytically degrading dyestuff wastewater

Examples

Experimental program
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Example Embodiment

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

[0032] Specifically include the following steps:

[0033] a, prepare Mg(NO 3 ) 2 And Al(NO 3 ) 3 The mixed aqueous solution, wherein the molar ratio of Mg to Al is 3, and the concentration of the mixed aqueous solution is 0.4mol / L;

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

[0035] c. The precipitate prepared in step b is suction filtered, washed with deionized water, and then dried at 100°C for 6 hours, then calcined in an air atmosphere at 800°C for 6 hours...

Example Embodiment

[0038] Example 2 Preparation of ionic liquid

[0039] Dissolve 3-bromopropylamine hydrobromide in anhydrous acetonitrile, add 1-methylimidazole, increase the temperature to 55°C for the reaction, the time from the beginning of the temperature 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 ether, and remove methanol and ether by rotary evaporation. Dissolve the residue in methanol, add saturated NaOH methanol solution until the pH value of the solution reaches 8.5. Rotary evaporation to remove the methanol, centrifuge to separate the inorganic salt with hexafluoro Ammonium phosphate was reacted for 1 hour, and then separated by silica gel column chromatography to obtain orange-red 1-methyl-3aminopropylimidazole hexafluorophosphate ionic liquid, which was stored at 4°C for later use. Among them, the molar ratio of 3-bromopropylamine hydrobromide, 1-methylimidazole, and ammonium hexafluorophosphate is ...

Example Embodiment

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

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

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Abstract

The invention provides a treatment technology for photocatalytically degrading dyestuff wastewater. A visible-light photocatalyst is an ion liquid modified perovskite covering type hydrotalcite photocatalyst. The catalyst takes perovskite covering type hydrotalcite with photocatalytic activity as a substrate; the catalyst is modified by ion liquid capable of improving the visible-light utilizationrate of the substrate and improving the photocatalytic activity; the ion liquid is 1-methyl-3aminopropylhexafluorophosphate. 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 an organic dyestuff 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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IPC IPC(8): C02F9/08B01F11/02B01J31/38C02F101/30C02F101/34C02F101/38
CPCC02F9/00B01J31/38B01J35/004C02F2101/34C02F2101/38C02F2101/40C02F2101/308C02F2001/007C02F1/52C02F1/725C02F1/32C02F2305/10B01F31/80B01F2101/305
Inventor 牛笑天
Owner 牛笑天
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