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Photocatalyst for degrading organic dye waste water pollutants and preparation method thereof

A technology for organic dyes and photocatalysts, applied in the field of photocatalysts for degrading organic dye wastewater pollutants and their preparation, can solve problems such as affecting the effective area of ​​the catalysts, unfavorable photocatalyst efficiency, and limiting large-scale applications, and achieves high commercialization. Application prospects, high visible light absorption capacity, and the effect of loose application conditions

Inactive Publication Date: 2012-07-25
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the band gap (3.2eV) of titanium dioxide is too wide, and it can only be excited by the ultraviolet light part (wavelength less than 387nm) of less than 4% of the total energy in sunlight, and the visible light part (wavelength range, which accounts for 43% of the solar spectrum) 400-700nm) cannot be utilized, which limits its large-scale application
Researchers have successfully prepared nanoscale Ag by precipitation method, hydrothermal method and other methods. 3 VO 4 Particles, however, have a small specific surface area, which affects the effective area of ​​the catalyst and is not conducive to improving the efficiency of the photocatalyst

Method used

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  • Photocatalyst for degrading organic dye waste water pollutants and preparation method thereof
  • Photocatalyst for degrading organic dye waste water pollutants and preparation method thereof
  • Photocatalyst for degrading organic dye waste water pollutants and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0025] (1) Weigh 6.46g, 2.05g and 7.56g of ferric nitrate, magnesium nitrate and citric acid respectively, and dissolve them in 20ml of deionized water while stirring. Add about 20 ml of 30% ammonia water dropwise to the above mixed solution at a temperature of 60° C., adjust its pH value to 7, and continue stirring until a green gel is formed. The green gel was dried at 120°C for 24 hours to obtain a black precursor, and finally ground and calcined at 700°C for 3 hours to obtain reddish-brown magnesium ferrite powder.

[0026] (2) Weigh 2.40 g of sodium hydroxide, dissolve in 30 ml of deionized water with stirring in a water bath at 30° C., to obtain a sodium hydroxide solution. Weigh 10.10 g of silver nitrate, dissolve it in 30 ml of deionized water, stir and dissolve in a water bath at 30° C., and obtain a silver nitrate solution. Then, the silver nitrate solution was slowly added dropwise to the sodium hydroxide solution while stirring to form a yellow precipitate, which ...

Embodiment 2

[0029] (1) With the step of (1) in embodiment 1.

[0030] (2) With the step of (2) in embodiment 1.

[0031] (3) Weigh 0.002g of magnesium ferrite and 1.0g of silver vanadate, mix and grind them for 10min according to the mass ratio of magnesium ferrite / silver vanadate, and finally bake them at 300°C for 4 hours, and cool them naturally That is, MgFe calcined at 300°C 2 o 4 / Ag 3 VO 4 MgFe with a mass ratio of 0.002 2 o 4 / Ag 3 VO 4 Composite catalyst.

Embodiment 3

[0033] (1) With the step of (1) in embodiment 1.

[0034] (2) With the step of (2) in embodiment 1.

[0035] (3) Weigh 0.003g of magnesium ferrite and 1.0g of silver vanadate respectively, mix and grind them for 10min according to the mass ratio of magnesium ferrite / silver vanadate, and finally roast them at 300°C for 4 hours, and cool them naturally That is, MgFe calcined at 300°C 2 o 4 / Ag 3 VO4 MgFe with a mass ratio of 0.003 2 o 4 / Ag 3 VO 4 Composite catalyst.

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Abstract

The invention relates to a photocatalyst for degrading organic dye waste water pollutants. The catalyst is formed by compounding magnesium ferrite and silver vanadate nanoparticles. The chemical composition general formula of the photocatalyst is mMgFe2O4 / Ag3VO4, wherein m is the mass ratio of MgFe2O4 to Ag3VO4; and m is more than 0 and less than or equal to 0.005. A preparation method of the photocatalyst comprises the following steps of: firstly, preparing magnesium ferrite and silver vanadate powder with a citric acid sol-gel method and a chemical precipitation method respectively; secondly, mixing and grinding the magnesium ferrite and silver vanadate powder for 10 minutes according to the mass ratio of the magnesium ferrite to the silver vanadate; and lastly, baking at the temperature of 200-500 DEG C, and baking for 4 hours to obtain a finished catalyst. The catalyst has a simple preparation method, has high visible light degrading performance on organic pollutants in dye waste water, and contributes to recycling simultaneously.

Description

technical field [0001] The invention relates to a composite photocatalyst responding to visible light, in particular to a photocatalyst for degrading organic dye wastewater pollutants and a preparation method thereof. Background technique [0002] Since the 20th century, with the rapid economic growth and the promotion of industrialized production, human life has undergone earth-shaking changes. But at the same time, it has also caused huge threats and harm to the environment on which human beings depend for survival. At present, the governments of various countries have fully realized the seriousness of the environmental pollution problem, and raised the issues of environmental purification and energy development to a strategic height related to the survival and development of the country, so the research and technology development in this field have attracted much attention. . Among them, the pollution of dye wastewater is particularly serious. The dye wastewater has dee...

Claims

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Application Information

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IPC IPC(8): B01J23/89C02F1/30C02F1/72C02F101/30
CPCY02W10/37
Inventor 吴瑛张雷吴廷华何益明
Owner ZHEJIANG NORMAL UNIVERSITY
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