Preparation of magnetic nano-manganese iron oxyhydroxides and its application in catalytic ozone oxidation for pollution removal

Abstract

The present invention aims at removing the deficiencies and defects in the existing water treatment technology of trace amounts of phenacetin and other medicines and personal care products (PPCPs) in the water, and proposes a catalyst for water purification containing PPCPs such as phenacetin Preparation. The magnetic nano-manganese iron oxyhydroxide catalyst uses manganese salt and ferrite as the key active components, and integrates Fe x (OH) y , Mn x (OH) y The surface characteristics of binary metal oxyhydroxides not only have a larger specific surface area, but also a higher surface hydroxyl density is another important factor that provides their catalytic activity. More importantly, the magnetic nano-manganese iron oxyhydroxide is magnetic, and a magnetic field can be used to separate the catalyst in the powder state from the water phase. The catalyst can be applied to ozone catalytic oxidation technology to effectively improve the removal effect of PPCPs such as phenacetin in the water body, and play a decontamination effect on phenacetin to obtain better quality and stable effluent. Catalysts with broad application prospects.

Description

technical field [0001] The invention relates to the preparation of a magnetic nano-manganese iron oxyhydroxide catalyst and its catalytic ozone oxidation decontamination technology. Background technique [0002] In recent years, new pollutants—pharmaceuticals and personal care products (PPCPs) with “three causes” or endocrine disrupting effects have appeared in the surface water environment, arousing extensive attention from scholars from all over the world. Due to the extensive use of PPCPs by humans and livestock, the exposure types and concentrations of PPCPs in urban sewage showed an increasing trend. Exposure to PPCPs such as artificial musk, antibiotics, and steroid estrogens has also been found in surface water and urban sewage treatment plants in my country, with exposure concentrations ranging from tens of ng / L to hundreds of μg / L. Although the concentration of PPCPs in sewage is low, its impact on human health and ecological environment has long-term, potential an...

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Problems solved by technology

[0007] Generally, the separation conditions of heterogeneous solid catalysts are simple, and some catalysts do not even need to be separated (such as gas-solid two-phase catalysis), with less secondary pollution, and can be operated in uninterrupted flow; but most heterogeneous catalysts are sintered by high temperature or hydrothermal The oxides produced have limited catalytic activity points on the surface, relatively poor catalytic activity and unstable catalytic performance

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