Surface modified nano ferroferric oxide Fenton catalyst and preparation method thereof

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...

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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.Degradation of azo-dye orange II by a photoassisted Fenton reaction using a novel composite of iron oxide and silicate nanoparticles as a catalyst.Ind.Eng.Chem.Res.2003,42,2058-2066.); 2) These complete shell-core structures are easy to hinder the diffusion of pollutants and hydrogen peroxide to the surface of nano-Fe3O4, which will affect the treatment effect to a certain extent; 3) The complete shell-core structure may also inhibit charge transfer, leading to Humic acid coated Fe3O4magnetic nanoparticles as highly efficient Fenton-like catalyst for complete mineralization of sulfathiazole .J.Hazard.Mater.2011,190,559-565.); 4) These nano-Fenton catalysts with shell-core structure are relatively complex because of the complex process, such as repeated deposition and other processes (CN103331181A), resulting in high production costs

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