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Preparation method and application of catalyst for treating low-concentration formaldehyde wastewater

A formaldehyde wastewater and catalyst technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, heterogeneous catalyst chemical elements, etc., can solve the problems of scarce precious metal resources, restrictions on the promotion and application of formaldehyde removal, and high prices. The preparation method is simple, the operation is convenient, and the operation cost is low

Inactive Publication Date: 2017-05-10
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Precious metal resources are scarce and expensive, which limits the promotion and application of greenhouse catalytic oxidation to remove formaldehyde

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh 1.06g (0.01mol) vanadium pentoxide in a beaker, add 40ml of 10% hydrogen peroxide, 2.56g (8.80×10 -3 mol) nickel nitrate hexahydrate, 2.01g (8.81×10 -3 mol) antimony trichloride, stirred until completely dissolved, then evaporated to dryness, transferred the precipitate to a muffle furnace for calcination, the calcination temperature was 400°C, and the calcination time was 6 hours. The prepared nickel-antimony-vanadium composite oxide powder was placed in 1 mol / L sodium hydroxide solution and heated at 50°C for 24 hours, then filtered, washed to a pH value of 6.9, and then dried. Take out after cooling and set aside.

[0028] Take 0.1 gram of the nickel-antimony-vanadium composite oxide catalyst prepared by the above method and 0.3 g of hydrogen peroxide into the formaldehyde wastewater with a volume of 40 mL and a concentration of 1.0%, and catalytically degrade formaldehyde under stirring at normal temperature and pressure for 10 minutes. Then centrifuge for 1...

Embodiment 2

[0032] Weigh 1.06g (0.01mol) vanadium pentoxide in a beaker, add 40ml of 10% hydrogen peroxide, 2.56g (8.80×10 -3 mol) nickel nitrate hexahydrate, 2.01g (8.81×10 -3 mol) antimony trichloride, stirred until completely dissolved, then evaporated to dryness, transferred the precipitate to a muffle furnace for calcination, the calcination temperature was 700°C, and the calcination time was 7 hours. The prepared nickel-antimony-vanadium composite oxide powder was placed in 1 mol / L sodium hydroxide solution and heated at 80°C for 12 hours, then filtered, washed to a pH value of 7, and then dried. Take out after cooling and set aside.

[0033] Take 0.1 gram of the nickel-antimony-vanadium composite oxide catalyst prepared by the above method and 0.3 g of hydrogen peroxide into 40 mL of formaldehyde wastewater with a concentration of 1.0%, and catalytically degrade formaldehyde under stirring at normal temperature and pressure for 10 minutes. Then centrifuge for 10 minutes in a cent...

Embodiment 3

[0035] Weigh 1.06g (0.01mol) vanadium pentoxide in a beaker, add 40ml of 10% hydrogen peroxide, 2.56g (8.80×10 -3 mol) nickel nitrate hexahydrate, 2.01g (8.81×10 -3 mol) antimony trichloride, stirred until completely dissolved, then evaporated to dryness, transferred the precipitate to a muffle furnace for calcination, the calcination temperature was 900°C, and the calcination time was 8h. The prepared nickel-antimony-vanadium composite oxide powder was placed in 1 mol / L sodium hydroxide solution and heated at 100°C for 5 hours, then filtered, washed until the pH value was 7.2, and then dried. Take out after cooling and set aside.

[0036] Take 0.1 gram of the nickel-antimony-vanadium composite oxide catalyst prepared by the above method and 0.3 g of hydrogen peroxide into 40 mL of formaldehyde wastewater with a concentration of 1.0%, and catalytically degrade formaldehyde under stirring at normal temperature and pressure for 10 minutes. Then centrifuge for 10 minutes in a c...

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Abstract

The invention provides a preparation method and application of a catalyst for treating low-concentration formaldehyde wastewater. A composite oxide is a nickel antimony vanadium composite oxide. The method is performed according to the following steps of using vanadium pentoxide, soluble nickel salt, antimony trichloride and hydrogen peroxide as raw materials; mixing the materials at low temperature; stirring the mixture till the dissolution; then, performing heating evaporation drying; and roasting the obtained precipitates so as to obtain the nickel antimony vanadium composite oxide powder. The prepared nickel antimony vanadium composite oxide powder is put into an aqueous alkali solution to be subjected to heating treatment; then, filtering and washing are performed until the pH value is 6.9 to 7.2; next, drying is performed; the catalyst is obtained. The catalyst provided by the invention has the characteristics that the activity is high; the hydrogen peroxide can be fast and effectively catalyzed within a short time for degrading contaminants; the wastewater treatment method can be performed at normal temperature and normal pressure without light irradiation; the technical flow process is simple; no secondary pollution is generated; in addition, the operation cost is low, and the like. In addition, the catalyst can be repeatedly used for many times; high practical application values can be realized.

Description

[0001] Technical field: [0002] The invention relates to the field of inorganic material preparation, in particular to a preparation method and application of a catalyst for treating low-concentration formaldehyde wastewater. [0003] Background technique: [0004] Formaldehyde is easily soluble in water and has a strong pungent odor. It is an important chemical raw material widely used in disinfection, sterilization, antisepsis, pharmaceuticals, pesticides, dyes, plastics, construction and other industries. However, formaldehyde is highly toxic and has been identified as carcinogenic and teratogenic substances by the World Health Organization. At present, the methods for removing formaldehyde in wastewater include adsorption method, ozone oxidation method, thermal wet oxidation method, photocatalytic method, biological method, stripping method, etc. The adsorption method has poor selectivity and difficult regeneration. The ozone used by the ozone oxidation method is extrem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/847C02F1/72C02F101/34
CPCB01J23/002B01J23/8472B01J2523/00C02F1/722C02F1/725C02F2101/34B01J2523/53B01J2523/55B01J2523/847
Inventor 周国华
Owner HUBEI UNIV OF TECH
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