Surface-modified nanometer ferric oxide Fenton catalyst and preparation method thereof

A technology of surface modification nanometer and iron tetroxide, applied in the direction of oxidized water/sewage treatment, etc., can solve the problems of easily hindering the diffusion of pollutants and hydrogen peroxide, inability to carry out the Fenton reaction, and high production cost, and is suitable for large-scale preparation. , good catalytic efficiency, low cost effect

Active Publication Date: 2016-03-23
SOUTHWEST UNIVERSITY FOR NATIONALITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these nano-Fenton catalysts with shell-core structure still have the following problems: 1) Many nano-Fenton catalysts with shell-core structure still need to rely on external energy or be applicable under acidic conditions (Feng.J.; Hu, X. ;, Yue, P.Degradationofazo-dyeorangeIIbyaphotoassistedFentonreactionusinganovelcompositeofironoxideandsilicatenoparticlesasacatalyst.Ind.Eng.Chem.Res.2003,42,2058-2066.); 2) These complete shell-core structures are easy to hinder pollutants and hydrogen peroxide to the surface of nanometer ferric oxide , which will affect the treatment effect to a certain extent; 3) The complete shell-core structure may also inhibit charge transfer, resulting in the failure of the Fenton reaction (Niu,H.; Zhang,D.; Zhang,S.; Zhang, X.; Meng, Z.; Cai, Y.HumicacidcoatedFe3O4magnetic nanoparticles ahighlyefficientFenton-likecatalystforcompletemineralizationofsulfathiazole.J.Hazard.Mater.2011,190,559-565.); 4) These nano-Fenton catalysts with shell-core structure are more complicated because of the complex process. Repeated deposition and other process preparation (CN103331181A), resulting in high production costs

Method used

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  • Surface-modified nanometer ferric oxide Fenton catalyst and preparation method thereof
  • Surface-modified nanometer ferric oxide Fenton catalyst and preparation method thereof
  • Surface-modified nanometer ferric oxide Fenton catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] First take by weighing ferric sulfate and ferrous sulfate as 2.0 according to the mass ratio of ferric salt and ferrous salt, add to deionized water, then add Span 20 with a mass ratio of 3:1 to the theoretical output of ferric oxide and mix Stir to make it fully dissolved to obtain a mixed solution of iron ions; place the mixed solution of iron ions in an ultrasonic generator, and add a precipitant solution prepared by sodium citrate and potassium hydroxide dropwise while ultrasonically oscillating until the pH of the system reaches 12, of which lemon The concentration of sodium hydroxide is 0.05g / mL, the concentration of potassium hydroxide is 2mol / L, and the ultrasonic vibration is continued for 10 minutes, and then magnetic separation is carried out. The product is washed with water and ethanol in turn, and dried to obtain nanometer iron tetraoxide powder; Iron powder is added to the deionized water / isopropanol mixture with a mass ratio of 1:1, and ultrasonically osc...

Embodiment 2

[0041] First weigh ferric chloride and ferrous chloride by ferric salt and ferric salt mass ratio 1.5, add deionized water, then add Tween with a mass ratio of 5:1 with the theoretical output of ferric oxide. 80 and stir to make it fully dissolved to obtain a mixed solution of iron ions; place the mixed solution of iron ions in an ultrasonic generator, and add dropwise a precipitant solution prepared by potassium citrate and sodium hydroxide until the pH of the system reaches 11 while ultrasonically vibrating. Wherein the concentration of potassium citrate is 0.1g / mL, the concentration of sodium hydroxide is 1mol / L, and the ultrasonic vibration is continued for 10min, and then magnetic separation is carried out, and the product is washed with water and ethanol successively, and dried to obtain nanometer ferric oxide powder; Add ferric oxide powder into the deionized water / n-hexanol mixture with a mass ratio of 2:1, and ultrasonically vibrate to obtain a uniform dispersion (the ...

Embodiment 3

[0044] First weigh ferric nitrate and ferrous nitrate according to the mass ratio of ferric salt and ferrous salt as 2.5, add them into deionized water, and then add nonylphenol polymer with a mass ratio of 10:1 to the theoretical yield of ferric oxide. Oxyethylene ether and stir to make it fully dissolved to obtain a mixed solution of iron ions; place the mixed solution of iron ions in an ultrasonic generator, and add dropwise a precipitant solution prepared by sodium citrate and ammonia water while ultrasonically vibrating until the pH of the system reaches 11, Wherein the concentration of potassium citrate is 0.08g / mL, the concentration of ammonia water is 5mol / L, then continue ultrasonic vibration for 20min, then carry out magnetic separation, the product is washed with water and ethanol successively, and dried to obtain nano iron tetraoxide powder; Add the ferric iron powder into the deionized water / glycerol mixed solution with a mass ratio of 1:10, and obtain a uniform di...

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Abstract

The invention discloses a surface modified nano ferroferric oxide Fenton catalyst and a preparation method thereof. The preparation method of the surface modified nano ferroferric oxide Fenton catalyst comprises the following steps: firstly preparing high dispersibility nano ferroferric oxide by adopting a coprecipitation method, and then carrying out surface modification on the nano ferroferric oxide by adopting a hydrolysis method. Organic acid salt and a non-ionic surface active agent are added when the coprecipitation method is adopted for preparing ferroferric oxide particles, so that the quantity of inorganic matters deposited on the surfaces of the ferroferric oxide particles is low, enrichment of reaction substrate and charge transfer on the surfaces of the ferroferric oxide particles can be enhanced, good catalytic efficiency can be realized at room temperature in a larger pH range, and the surface modified nano ferroferric oxide Fenton catalyst can be used for advanced oxidation treatment of dye sewage, organic pollutant sewage, pesticide sewage and the like. Therefore, the preparation method of the surface modified nano ferroferric oxide Fenton catalyst has the characteristics of simplicity in operation, mild conditions, adaptability to large-scale preparation and the like, cost for obtaining the product is low, and the obtained product can be widely and more easily popularized.

Description

technical field [0001] The invention belongs to the technical field of heterogeneous Fenton catalysts and preparation thereof, and in particular relates to a surface-modified nanometer iron ferric oxide Fenton catalyst and a preparation method thereof. Background technique [0002] Advanced Oxidation Process (AOP) is a very commonly used chemical method in sewage treatment because it can treat pollutants that cannot be degraded by microbial methods. Fenton's reagent is the most commonly used catalyst in advanced oxidation methods. Its principle is to use ferrous ions to catalyze the decomposition of hydrogen peroxide to generate free radicals, which then attack pollutants to oxidize and decompose pollutants. Although the traditional Fenton's reagent can handle pollutants that cannot be degraded by microbial methods, it still needs improvement due to many shortcomings. Such as Fenton's reagent requires sufficient Fe 2+ To assist the catalytic reaction, but after the reactio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/745C02F1/72
Inventor 杨胜韬杨丽君张武王瑞珏
Owner SOUTHWEST UNIVERSITY FOR NATIONALITIES
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