A kind of heterogeneous cu-mn-ce class fenton catalyst and its preparation method and application

Abstract

The invention provides a preparation method and application of a high-performance heterogeneous Fenton-like catalyst. The preparation method comprises the following steps: (1) preparing a mixed solution of copper nitrate, cerium nitrate and manganese nitrate; (2) repeatedly immersing a highly ordered mesoporous silicon oxide material in the mixed solution obtained in step (1), filtering, Washing and drying; (3) Calcining the material prepared in step (2) in a muffle furnace to obtain a heterogeneous Cu-Mn-Ce-based Fenton catalyst. The Fenton-like reaction system composed of the catalyst and hydrogen peroxide can efficiently catalyze and degrade high-concentration dye wastewater under low temperature and normal pressure conditions. It has the advantages of simple production process, low cost, large specific surface area, narrow pore size distribution, and high catalytic activity. Wide pH range and other advantages.

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 carriers for dispersion, and the heterogeneous catalysts prepared by them also show 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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