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

An oxyhydroxide, magnetic nanotechnology, applied in metal/metal oxide/metal hydroxide catalyst, oxidized water/sewage treatment, physical/chemical process catalyst, etc., can solve the problem of unstable catalytic performance, poor catalytic activity, The problem of limited catalytic active points, etc., achieves the effect of short preparation cycle, low cost and easy operation.

Active Publication Date: 2016-06-08
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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

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Embodiment approach

[0026] The preparation steps of the magnetic nano-manganese iron oxyhydroxide catalyst will be described below in conjunction with specific embodiments, so as to further understand the invention. The technical solution of the present invention is not limited to the specific embodiments listed below, but also includes any combination of the specific embodiments.

specific Embodiment approach 1

[0027] Specific embodiment one: the preparation method of magnetic nano-manganese iron oxyhydroxide catalyst is carried out according to the following steps

[0028] (1) Accurately weigh 6.275g (0.025mol) manganese nitrate tetrahydrate, 20.2g (0.05mol) ferric nitrate nonahydrate, completely dissolve in 100mL deionized water to obtain a clear solution, and place it still for 0.5 hours;

[0029] (2) Accurately weigh 80g (2mol) of sodium hydroxide and completely dissolve it in 250mL of deionized water;

[0030] (3) Add 75 mL of NaOH solution dropwise to the mixed solution of manganese nitrate and ferric nitrate to adjust the pH value of the mixed solution to between 7 and 8 to form a suspension with precipitation;

[0031] (4) Heat the above suspension to 90.0°C, and age at this temperature for 2h;

[0032] (5) Wash the aged suspension, the specific process is: dump the supernatant, add deionized water and stir to clean the sediment in the suspension, then cover the bottle mouth a...

specific Embodiment approach 2

[0036] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the 6.275g (0.025mol) Mn(NO 3 ) 2 4H 2 O was replaced by 7.27g (0.025mol) Ni(NO 3 ) 2 ·6H 2 O, other steps and parameters are the same as the specific embodiment one, that is, the magnetic nano-nickel-iron oxyhydroxide catalyst (NiFe 2 (OH) 8 , MFOH) preparation method.

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/889B01J23/755C02F1/78
Inventor 齐飞郭杨徐冰冰孙德智
Owner BEIJING FORESTRY UNIVERSITY
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