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High-efficiency Fenton-like magnetic catalyst based on clay minerals and its preparation method and application

A magnetic catalyst and clay mineral technology, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of magnetic disappearance of catalytic materials and low metal doping , to achieve the effects of good ecological compatibility, low equipment requirements, and improved catalytic decomposition ability

Active Publication Date: 2018-09-11
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the doping metal that this method can introduce is very low, only 0.1-5% of iron, because a higher content of doping metal will cause the interaction between doping metal and iron oxide to form a non-magnetic composite metal oxide , leading to the disappearance of the magnetic properties of the final catalytic material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Add clean kaolin into ferrous sulfate and ferric sulfate solution, the theoretical mass ratio of iron oxide to kaolin is 0.05, the molar ratio of ferrous sulfate and ferric sulfate is 0.3, and the total iron content is 0.1 mol / liter for the preparation of iron salt solution. The suspension was heated up to 60°C and kept stirring for 0.5 hours to stabilize;

[0028] (2) Add 5 mol / liter of sodium hydroxide to the suspension to raise the pH value of the solution to 8, and continue stirring for 0.5 hours; the solid precipitate is washed and dried to obtain a precursor powder;

[0029] (3) The precursor powder is immersed in a 0.05 mol / L manganese nitrate aqueous solution, wherein the molar ratio of manganese to iron is 0.1, the solution is stirred and evaporated to dryness, and the dried mixed powder is placed in an air atmosphere, and the temperature is raised at 1 °C / min High-efficiency Fenton-like magnetic catalysts can be obtained by heat treatment at 200°C in air...

Embodiment 2

[0032] (1) Add clean bentonite to ferrous chloride and ferric chloride solution, the theoretical mass ratio of iron oxide to kaolin is 2, the molar ratio of ferrous chloride and ferric chloride is 3, and the total iron content The iron salt solution was prepared at 5 mol / L. The suspension was heated to 100°C and kept stirring for 5 hours to stabilize;

[0033] (2) Add 2 mol / liter of sodium hydroxide to the suspension so that the pH value of the solution rises to 11, and continue to stir for 6 hours; the solid precipitate is washed and dried to obtain a precursor powder;

[0034] (3) The precursor powder is immersed in a 2 mol / L copper nitrate aqueous solution, where the molar ratio of copper to iron is 1, the solution is stirred and evaporated to dryness, the dried mixed powder is placed in an air atmosphere, and the temperature is raised at 20°C / min High-efficiency Fenton-like magnetic catalysts can be obtained by heat treatment at 600°C in air for 48 hours.

[0035] (4) Te...

Embodiment 3

[0037] (1) Add clean illite into ferrous chloride and ferric sulfate solution, the theoretical mass ratio of iron oxide and kaolin is 1, the molar ratio of ferrous chloride and ferric sulfate is 2, and the total iron content is 1 mol / L for the preparation of iron salt solution. The suspension was heated to 80°C and kept stirring for 2 hours to stabilize;

[0038] (2) Add 1 mol / liter of sodium hydroxide to the suspension to raise the pH value of the solution to 9, and continue to stir for 2 hours; the solid precipitate is washed and dried to obtain the precursor powder;

[0039] (3) The precursor powder is immersed in 1 mol / L copper nitrate and aluminum nitrate aqueous solution, wherein the molar ratio of copper: aluminum: iron is 1:1:5, the solution is stirred and evaporated to dryness, and the dried mixed powder is placed in the air In the atmosphere, the high-efficiency Fenton-like magnetic catalyst can be obtained by heating at 10°C / min to 450°C in air for 24 hours.

[00...

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Abstract

The invention relates to a high-efficiency Fenton magnetic catalyst based on clay minerals and a preparation method and an application thereof. The preparation method comprises the preparation steps: (1) putting clean clay minerals into a pre-prepared ferric salt solution, heating the suspension after mixing to 60-100 DEG C, and continuously stirring for 0.5-5 h to reach stable; (2) adding an alkali liquor into the suspension, making the pH value of the solution rise to 8-11, continuously stirring for 0.5-6 h, and carrying out washing, drying and other processes of a solid precipitate to obtain a precursor powder; and (3) impregnating the precursor powder in a solution containing other non-ferrous metal salts, uniformly drying by distillation, carrying out heat treatment, and thus obtaining the high-efficiency Fenton magnetic catalyst based on the clay minerals. Compared with the prior art, the catalyst has magnetic separation performance, can be recycled and reused, and also has high-efficiency Fenton catalytic activity and stability in a near neutral pH value. The catalyst has the advantages of simple preparation process, relatively low cost and good ecological compatibility, and has wide application prospects in the field of treatment of difficult-to-degrade toxic organic pollutants.

Description

technical field [0001] The invention belongs to the technical field of inorganic nano functional materials and environmental pollution control, and in particular relates to a high-efficiency Fenton-like magnetic catalyst based on clay minerals, a preparation method and application. Background technique [0002] The current pollution situation of surface water, groundwater and soil in our country is serious. Among them, the pollutants represented by refractory persistent organic pollutants such as pesticides, antibiotic compounds, polycyclic aromatic hydrocarbons and azo dyes are in the environment we depend on for survival. Long-term existence will pose an irreversible potential threat to the ecological environment and people's health. Developing effective organically polluted soil or water remediation technology has become an important task in the field of environmental pollution control. [0003] Advanced oxidation technologies, including methods such as photocatalysis, p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/889B01J23/745B01J23/75C02F1/72C02F101/30
CPCB01J23/002B01J23/745B01J23/75B01J23/8892B01J35/0033B01J2523/00C02F1/725C02F2101/345C02F2305/026B01J2523/31B01J2523/41B01J2523/72B01J2523/842B01J2523/17B01J2523/845
Inventor 龙明策金明杰苏寒瑞
Owner SHANGHAI JIAOTONG UNIV
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