Magnetic submicron composite core-shell particles, and preparation method and application thereof

A composite particle and sub-micron technology, which is applied in the fields of magnetic properties of inorganic materials, chemical instruments and methods, and alkali metal compounds, can solve the problems of secondary pollution, high cost, and low adsorption efficiency, and achieve stable adsorption performance and good adsorption efficiency , to avoid the effect of secondary pollution

Inactive Publication Date: 2012-02-22
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a magnetic submicron composite core-shell particle with a three-layer core-shell structure, which solves the problems of low adsorption efficiency, high cost and secondary pollution of existing heavy metal ion adsorption materials

Method used

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  • Magnetic submicron composite core-shell particles, and preparation method and application thereof
  • Magnetic submicron composite core-shell particles, and preparation method and application thereof
  • Magnetic submicron composite core-shell particles, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0052] (1) Prepare Fe according to the general procedure 3 o 4 submicron particles

[0053]Dissolve 1.35 g of ferric trichloride hexahydrate in 40 mL of ethylene glycol, add 3.6 g of sodium acetate, and 1.0 g of polyethylene glycol 400 (molecular weight: 400) to form a mixed solution. The mixed solution was stirred for 30 min, sealed in a 100 mL autoclave, and reacted at 200° C. for 8 h. The obtained product was magnetically separated by a magnet, washed 3-5 times with deionized water, and dried in vacuum at 60°C for 6 hours to obtain a black magnetic Fe 3 o 4 Submicron particle powder, the particle size is 300nm-600nm.

[0054] (2) Prepare Fe according to the general procedure 3 o 4 -SiO 2 Composite particles

[0055] The prepared above-mentioned Fe 3 o 4 Pour 1.0g of submicron particles into a three-necked flask, add 100g of isopropanol, stir at 40°C for 30min, then add 5.5g of deionized water, 0.66g of ammonia water with a concentration of 30% by mass and 0.3g of ...

Embodiment 2

[0057] The magnetic Fe prepared by 0.5g embodiment 1 3 o 4 -SiO 2 Submicron composite particles were added to 50 g of chloroform, and 0.1 g of thiophene monomer was added, and stirred thoroughly for 30 min to make them uniformly dispersed. 0.25g anhydrous FeCl 3 (ferric iron ion as an initiator) was uniformly dissolved in 10 g of chloroform, added dropwise to the above mixed solution, and reacted at 20° C. for 4 h. The reaction product was magnetically separated, washed with water and ethanol for 3 times, and then dried in vacuum at 60°C for 6 hours to obtain 400nm dense (Fe 3 o 4 -SiO 2 - polythiophene) magnetic submicron composite core-shell particles.

Embodiment 3

[0059] The magnetic Fe prepared by 1g embodiment 1 3 o 4 -SiO 2 Submicron composite particles were added to 900g of chloroform, and 2g of diaminothiophene monomer was added, and stirred thoroughly for 30min to make them evenly dispersed. 5 g anhydrous FeCl 3 Uniformly dissolved in 100g of chloroform (ferric iron ion as initiator), added dropwise to the above mixed solution, and reacted at 20°C for 4h. The reaction product was magnetically separated, washed with water and ethanol for 5 times, and dried in vacuum at 60°C for 12 hours to obtain 1000nm dense (Fe 3 o 4 -SiO 2 - polydiaminothiophene) magnetic submicron composite core-shell particles.

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Abstract

The invention discloses magnetic submicron composite core-shell particles. In the magnetic submicron composite core-shell particles, Fe3O4 particles with the particle size of between 80 and 800nm are taken as a magnetic core, amorphous SiO2 is taken as an immediate shell layer and a substance with heavy metal absorption performance is taken as an outer shell layer. The invention also discloses a preparation method for the magnetic submicron composite core-shell particles. The preparation method comprises the following steps of: preparing the Fe3O4 particles with the particle size of between 80 and 800nm by a solvothermal method and taking the Fe3O4 particles as magnetic cores, performing alkaline hydrolysis of a silicon source reagent on Fe3O4 and dehydrating and condensing hydroxy groups so as to obtain amorphous SiO2 immediate shell layers, and coating the substance with heavy metal absorption performance on obtained submicron spheres under chemical or physical action to obtain the magnetic submicron composite core-shell particles. The submicron material has high performance of absorbing heavy metal ions in the sewage; and the material has stable characteristics, can be magnetically recovered and meets environmental protection requirements, and secondary pollution is avoided.

Description

technical field [0001] The invention relates to the field of submicron materials, in particular to a magnetic submicron composite core-shell particle with a three-layer core-shell structure and a preparation method and application thereof. Background technique [0002] Heavy metal pollution has become an urgent environmental problem worldwide. Their pollution is ubiquitous, already permeating water, the atmosphere and the pedosphere. However, heavy metals are an inevitable product of the operation of multiple industrial enterprises, such as chemical manufacturing, petroleum industry, fossil fuel combustion, mining industry, metallurgy industry, nuclear industry, etc., and cannot be absolutely prohibited from the source. However, heavy metal pollution can cause great harm to humans and various organisms. Excessive heavy metal elements can cause damage to the kidneys, brain, blood, liver, central nervous system, digestive system, and nervous system. In addition, the release ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/11B01J20/28B01J20/30
Inventor 宋伟杰张帆杨晔赵宗山程杨江桂斌谭瑞琴
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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