Porous magnetic iron oxide red with abundant lattice defects and preparation method thereof

A technology of magnetic iron oxide red and lattice defects, applied in iron oxide, chemical instruments and methods, iron oxide/iron hydroxide, etc., can solve the problem of difficult control of iron oxide particle size, crystal plane orientation and growth rate, and unfavorable sewage treatment Practical application and other issues, to achieve the effect of low cost, low temperature, and improved reaction efficiency

Active Publication Date: 2019-06-18
INST OF AGRI ENG TECH FUJIAN ACAD OF AGRI SCI
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Problems solved by technology

[0004] Generally, to obtain iron oxide through ferric salt hydrolysis, it is necessary to ensure that the pH value of the hydrolysis solution is greater than 3.8, and the particle size, crystal plane orientation and growth rate of the hydrolyzed ferric hydroxide after heating and dehydration are not easy to control, which is not conducive to the practical application of sewage treatment

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  • Porous magnetic iron oxide red with abundant lattice defects and preparation method thereof
  • Porous magnetic iron oxide red with abundant lattice defects and preparation method thereof
  • Porous magnetic iron oxide red with abundant lattice defects and preparation method thereof

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preparation example Construction

[0035] A method for preparing porous lattice-defect-rich magnetic iron oxide, comprising the following steps:

[0036] 1) Preparation of ferric hydroxide: Mix anhydrous sodium hydroxide and anhydrous potassium hydroxide, and melt at 166 ℃ ± 1 ℃, 0.1 MPa for 60 min ± 2 min to prepare mixed alkali clarification liquid; Add ferric chloride powder into the mixed alkali clarified liquid, stir for 5-6min to obtain sodium hydroxide+potassium hydroxide+ferric chloride molten liquid; put sodium hydroxide+potassium hydroxide+ferric chloride molten liquid at 166 Under the conditions of ℃±1 ℃ and 0.1 MPa, keep warm for 2160 min±10 min to obtain a molten solution containing ferric hydroxide;

[0037] 2) Add hydrochloric acid solution with pH=1 to the molten solution containing ferric hydroxide while it is hot, stir for 10 min, then cool to room temperature naturally, centrifuge, and take the reddish-brown product in the lower layer;

[0038] 3) After washing the reddish-brown product with...

Embodiment 1

[0046]A method for preparing porous lattice-defect-rich magnetic iron oxide, comprising the following steps:

[0047] 1) Preparation of ferric hydroxide: Mix anhydrous sodium hydroxide and anhydrous potassium hydroxide, melt at 166 °C and 0.1 MPa for 60 min to obtain a mixed alkali clarification liquid; add ferric chloride powder to mix In the clarified alkali solution, stir for 5 minutes to obtain a molten solution of sodium hydroxide + potassium hydroxide + ferric chloride; keep the molten solution of sodium hydroxide + potassium hydroxide + ferric chloride at 166 ° C and 0.1 MPa for 2160 min, to obtain a melt containing ferric hydroxide;

[0048] 2) Add hydrochloric acid solution with pH=1 to the molten solution containing ferric hydroxide while it is hot, stir for 10 min, then cool to room temperature naturally, centrifuge, and take the reddish-brown product in the lower layer;

[0049] 3) The red-brown product was washed with deionized water and absolute ethanol respecti...

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Abstract

The invention relates to a porous magnetic iron oxide red with abundant lattice defects and a preparation method thereof. Mixed sodium hydroxide and potassium hydroxide are taken as the molten solvent; iron trichloride is taken as the raw material; a hydrochloric acid solution with a pH value of 1 and deionized water are taken as a washing agent, a detergent and an extracting agent; anhydrous ethanol is taken as the detergent and a drying carrier; reactions are carried out in a liquid alkali environment at a temperature of 166 to 180 DEG C under a normal pressure; due to low surface energy, oriented connection easily happens on a crystal plane to generate lattice defects; after deionized water extraction, iron hydroxide is formed, then iron hydroxide is burned at a temperature of 300 to 500 DEG C to obtain the iron oxide red with a porous structure, the purity is high, and the iron oxide red is stable, nontoxic, and magnetic. During the synthesis process, no dispersant is used, the rawmaterials are few, the technical process is short, the operation is simple, and the cost is low. The method is a very ideal method for preparing the porous magnetic iron oxide red with abundant lattice defects.

Description

technical field [0001] The invention belongs to the field of preparation of iron oxide materials, and in particular relates to a porous rich lattice defect magnetic iron oxide red and a preparation method thereof. Background technique [0002] With pollution becoming one of the greatest environmental challenges of the 21st century, with water contamination threatening the very existence of humankind, immediate action is a top priority. Some of the most persistent and dangerous pollutants come from agricultural activities, so effective treatment of this wastewater before discharge into the natural environment is the answer. When dealing with wastewater pollutants produced in agriculture, fishery and animal husbandry, nano-magnetic iron oxide red has a photocatalytic effect, and the holes formed by electronic transitions under sunlight will oxidize the hydroxide in the water to strong oxidizing OH. , OH can catalyze the oxidation and decomposition of pollutants. In the later ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06B82Y30/00C02F1/30C02F1/72C02F3/34C02F3/28C02F103/20C02F101/38C02F101/16
Inventor 李洁陈彪黄婧
Owner INST OF AGRI ENG TECH FUJIAN ACAD OF AGRI SCI
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