Photocatalyst for degrading organic pollutant and preparation method thereof

A technology of organic pollutants and photocatalysts, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problem of low photocatalytic activity, and achieve stable photocatalytic degradation performance and good visible light. Degradation activity, effect of high visible light responsiveness

Inactive Publication Date: 2013-01-30
浙江梦家园生物科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to many research results, the photocatalytic activity of the modified catalyst is not very high under sunlight irradiation, and there are some problems in terms of stability.

Method used

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  • Photocatalyst for degrading organic pollutant and preparation method thereof
  • Photocatalyst for degrading organic pollutant and preparation method thereof
  • Photocatalyst for degrading organic pollutant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Weigh 1.052g of samarium oxide, add 3mL of concentrated nitric acid and 12mL of deionized water, stir and dissolve to obtain a samarium nitrate solution. Weigh 0.706g of ammonium metavanadate, add 6mL concentrated ammonia water and 24mL deionized water, stir until dissolved, then add samarium nitrate solution drop by drop, adjust the mixture pH=7, a white precipitate is formed, continue to stir and age for 1h to obtain the mixture Ⅰ . Weigh 0.362 g of silver nitrate and dissolve it in 10 mL of deionized water, add it dropwise to I, and continue stirring for 30 min to obtain mixture II. Then weigh 0.220g of sodium bromide and dissolve it in 10mL of deionized water, add it dropwise to II, stir and age for 5 hours, then centrifuge and wash, dry the obtained solid in an oven at 120°C, grind it, and finally roast it at 500°C After cooling for 2 hours, 0.353AgBr / SmVO calcined at 500°C was obtained 4 catalyst.

Embodiment 2

[0023] Weigh 0.920 g of samarium oxide, add 3 mL of concentrated nitric acid and 12 mL of deionized water, stir and dissolve to obtain a samarium nitrate solution. Weigh 0.618g of ammonium metavanadate, add 6mL of concentrated ammonia water and 24mL of deionized water, stir until dissolved, then add samarium nitrate solution drop by drop, adjust the pH of the mixture to 7, a white precipitate is formed, continue to stir and age for 1h to obtain the mixture Ⅰ . Weigh 0.542 g of silver nitrate and dissolve it in 10 mL of deionized water, add it dropwise to I, and continue stirring for 30 min to obtain mixture II. Then weigh 0.328g of sodium bromide, dissolve it in 10mL of deionized water, add it dropwise to II, stir and age for 5 hours, then centrifuge and wash, dry the obtained solid in an oven at 120°C, grind it, and finally roast it at 500°C After cooling for 2 hours, 0.605AgBr / SmVO calcined at 500°C was obtained 4 catalyst.

Embodiment 3

[0025] Weigh 0.788g of samarium oxide, add 3mL of concentrated nitric acid and 12mL of deionized water, stir and dissolve to obtain a samarium nitrate solution. Weigh 0.530g of ammonium metavanadate, add 6mL of concentrated ammonia water and 24mL of deionized water, stir until dissolved, then add samarium nitrate solution drop by drop, adjust the pH of the mixture to 7, and form a white precipitate, continue to stir and age for 1h to obtain the mixture Ⅰ . Weigh 0.724 g of silver nitrate and dissolve it in 10 mL of deionized water, add it dropwise to I, and continue stirring for 30 min to obtain mixture II. Then weigh 0.438g of sodium bromide, dissolve it in 10mL of deionized water, add it dropwise to II, stir and age for 5 hours, then centrifuge and wash, dry the obtained solid in an oven at 120°C, grind it, and finally roast it at 500°C After cooling for 2 hours, 0.942AgBr / SmVO calcined at 500°C was obtained 4 catalyst.

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Abstract

The invention discloses a photocatalyst for degrading an organic pollutant and a preparation method thereof. The catalyst is silver bromide modified nano vanadate samarium; the chemical composition formula is x AgBr / SmVO4; x is atomic ratio of silver to samarium, and x is smaller than or equal to 2.119 and greater than or equal to 0.353. The preparation method comprises the steps of: (1) weighing samarium oxide and ammonium metavanadate, respectively dissolving into nitric acid to mix with ammonia water, adjusting pH to obtain sediment, wherein the mixture is I; (2) weighing silver nitrate (nAg / nSm is smaller than or equal to 2.119 and greater than or equal to 0.353), dissolving into deionized water, adding to I, and agitating to obtain mixture II; (3) weighing sodium bromide (nBr / nAg=1), dissolving into the deionized water, adding to II, agitating and aging and then centrifugally washing, baking at 120 DEG C, grinding, and roasting at 300-600 DEG C, and cooling to obtain the product. The catalyst is simple in preparation method, and excellent in visible light photocatalytic degradation performance as to a plurality of organic pollutants.

Description

technical field [0001] The invention relates to a novel photocatalyst responsive to visible light, in particular to a photocatalyst for degrading organic pollutants and a preparation method thereof. Background technique [0002] With the rapid development of modern industry and agriculture, the problem of environmental pollution is becoming more and more serious. Some refractory organic substances such as dyes and pesticides often exist in air, water and soil at very low concentrations, seriously affecting people's health and life. Therefore, economically and effectively purifying environmental pollution is a major strategic issue facing today. Traditional sewage treatment methods mainly include physical methods, biological methods and chemical oxidation methods, but these treatment methods generally have problems such as long treatment period, low degradation rate, and complete refractory degradation. Therefore, from the perspective of protecting the environment and saving...

Claims

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Application Information

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IPC IPC(8): B01J27/08A62D3/17
Inventor 赵雷洪李婷婷何益明蔡军董吕卓王小星
Owner 浙江梦家园生物科技股份有限公司
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