Heterogeneous Cu-Mn-Ce Fenton-like catalyst, and preparation method and use thereof

Abstract

The invention provides a preparation method and a use of a high-performance heterogeneous Cu-Mn-Ce Fenton-like catalyst. The preparation method of the catalyst comprises the following steps: 1, preparing a copper nitrate, cerium nitrate and manganese nitrate mixed solution; 2, repeatedly dipping a highly ordered meso-porous silicon oxide material in the mixed solution obtained in step 1, filtering, washing, and drying; and 3, calcining a material prepared in step 2 in a muffle furnace to obtain the heterogeneous Cu-Mn-Ce Fenton-like catalyst. A Fenton-like reaction system formed by the catalyst and hydrogen peroxide can realize efficient catalytic degradation of high-concentration dye wastewater at a low temperature under normal pressure, and has the advantages of simple making technology, low cost, large specific surface area, narrow aperture distribution, high catalysis activity and wide pH application range.

Description

technical field [0001] The invention belongs to the field of catalyst preparation and application, and relates to a heterogeneous Cu-Mn-Ce Fenton catalyst, a preparation method and application thereof. Background technique [0002] Dye wastewater has caused serious environmental pollution and a great threat to human health. Although the traditional homogeneous Fenton catalyst has considerable catalytic activity for dye wastewater, its pH range is narrow. Therefore, it is of great engineering practical significance to prepare a heterogeneous catalyst with high efficiency and a wide pH range. In recent years, some heterogeneous catalysts for dye wastewater have also been reported. Among them, the researchers found that bimetallic mixed oxide catalysts, such as MO·Fe 2 o 3 (M:Fe,Co,Cu,Mn), generally has higher catalytic activity than Fe2O3 catalysts, and CuO·Fe 2 o 3 and CoO·Fe 2 o 3 It also has a wider pH tolerance range (Applied Catalysis B: Environmental2006, 66, (3-4...

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Problems solved by technology

Among them, the researchers found that bimetallic mixed oxide catalysts, such as MO·Fe 2 o 3 (M:Fe,Co,Cu,Mn), generally has higher catalytic activity than Fe2O3 catalysts, and CuO·Fe 2 o 3 and CoO·Fe 2 o 3 It also has a wider pH tolerance range (Applied Catalysis B: Environmental2006, 66, (3-4), 258-264.), but this type of metal oxide catalyst is not dispersed and cannot reach the nanometer scale, and the contact surface is small , which limits its catalytic activity

There are also some researchers who disperse the active component Cu on ZSM-5 molecular sieves (Journal of hazardous materials 2007, 144, (3), 663-667), but the pores of ZSM-5 molecular sieves are microporous, which is difficult to apply to macromolecular substances.

Some researchers have selected some mesoporous supports for dispersion, and the heterogeneous catalysts prepared by them have also shown higher catalytic activity than undispersed catalysts, but the active components of this type of catalysts have no dispersant It is prone to agglomeration, which affects its catalytic activity (catalysis communications2006, 7, (7), 478-483)

According to the results of literature and patents, the existing heterogeneous Fenton catalysts for dye wastewater usually have low catalytic activity, uneven dispersion of active components, and easy agglomeration

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