Fenton catalyst for water treatment and preparation method thereof

Abstract

The invention relates to the technical field of water treatment and Fenton catalysts, in particular to a porous heterogeneous Fenton catalyst for water treatment. The catalyst is prepared by taking cerium oxide modified mesoporous iron oxide particles, a porous carrier, magnetic hercynite or hercynite, activated aluminum oxide, barium azodicarboxylate particles, a slow-release pore-forming agent, an optional high-temperature binder and other components as main raw materials through the steps of bonding with a bonding solution, granulating, thermally forming, loading and the like. The prepared Fenton catalyst particles have high porosity, catalytic activity and mechanical strength, and are suitable for treating organic wastewater through Fenton reaction.

Description

technical field [0001] The invention relates to the technical fields of water treatment and Fenton catalysts, in particular to a heterogeneous Fenton catalyst supported by a porous material and a preparation method and application thereof. Background technique [0002] Fenton oxidation technology is a commonly used wastewater treatment technology. It generates highly active hydroxyl radicals by catalyzing the decomposition of hydrogen peroxide. Hydroxyl radicals have high oxidation and non-specific selectivity, and can effectively degrade a variety of biodegradable organic compounds. pollutants. Therefore, Fenton oxidation can effectively degrade organic matter in wastewater and is an environmentally friendly wastewater treatment technology. However, ordinary Fenton oxidation has the disadvantages that the catalyst cannot be reused, the reaction rate is slow, the utilization rate of hydrogen peroxide is not high, iron sludge is produced by-product, and the post-treatment co...

AI Technical Summary

Problems solved by technology

1) The existing porous material-supported metal-like Fenton catalysts rely on the structural characteristics of the porous material itself, which makes its specific surface area limited, unable to expose more reaction contact surfaces, and thus unable to provide more catalytic active sites

[0008]2) Since the catalyst molding method is mainly medium-temperature calcination (because high-temperature calcination at about 1,000 degrees Celsius significantly reduces the activity of catalytic components, the calcination temperature is usually 600 degrees Celsius Left and right), although the prepared catalysts have a variety of pore structures and specific surface areas, their mechanical strength is generally poor, especially during the long-term operation reaction process, they are easily broken under the pressure generated by the flow of wastewater and other fluids, which affects the uniformity of the fluid. Flow and stable catalytic performance

[0009]3) The preparation of existing supported catalysts is mainly impregnation loading, which belongs to surface type loading (the impregnation method is to precipitate active metal oxides on the outer surface of porous materials and The inner surface of the pores), the catalytic component loading is low, easy to fall off (especially in the long-term immersion, the catalyst carrier is easy to absorb water and swell, resulting in a decrease in hardness, the particle structure becomes soft, more likely to be lost or even deactivated), and can not make the catalytic activity Components are highly and evenly dispersed in the catalyst

Even if there are a few catalytic components doped in the carrier skeleton, but there are few active sites exposed, it cannot have high catalytic activity and utilization of hydrogen peroxide

Moreover, the catalytic stability is poor in long-term use

[0010] However, in the current prior art, there is still a lack of Fenton catalyst fillers that can overcome or improve the above-mentioned defects

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