Amino-functionalization magnetic silicon dioxide-ferroferric oxide composite nanomaterial and preparation method thereof

A technology of composite nanomaterials and ferric oxide, which is applied in the field of materials to achieve the effects of high extraction efficiency, large specific surface energy and enhanced adsorption effect

Inactive Publication Date: 2015-07-08
HOHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, functionalized silica-ferric oxide composite materials are widely used in biomedicine, and have certain applications in catalysis, but the application of magnetic composite materials in the environment has only begun to receive attention in recent years, mainly It is applied to the detection of heavy metal ion pollution in the water environment, but there is no report on the trace detection of complex organic pollutants in the water environment

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  • Amino-functionalization magnetic silicon dioxide-ferroferric oxide composite nanomaterial and preparation method thereof
  • Amino-functionalization magnetic silicon dioxide-ferroferric oxide composite nanomaterial and preparation method thereof
  • Amino-functionalization magnetic silicon dioxide-ferroferric oxide composite nanomaterial and preparation method thereof

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Embodiment 1

[0026] (1) Co-precipitation method to synthesize magnetic ferric oxide nanoparticles: According to the molar ratio of 1:1.2, FeSO 4 ·7H 2 O, FeCl 3 ·6H 2 O was made into an aqueous solution with deionized water aerated with nitrogen for 30 minutes, mixed in a three-necked flask, and under the protection of nitrogen, 5% ammonia water was added dropwise in the three-necked flask, while stirring at a speed of 240r / min until the pH of the solution 8; reacted at room temperature for 2 hours, the obtained product was separated by magnetic absorption and washed several times, and then dialyzed for 48 hours, then dried in vacuum at constant temperature to obtain black magnetic ferric oxide nanoparticles. The scanning electron microscope image of the prepared magnetic ferric oxide particles is shown in figure 1 .

[0027] (2) Dissolve ferroferric oxide magnetic nanoparticles in ethanol, disperse them by ultrasonication for 1h, add 25% ammonia water, TEOS (tetraethyl orthosilicate),...

Embodiment 2

[0033] (1) Co-precipitation method to synthesize magnetic ferric oxide nanoparticles: According to the molar ratio of 1:1, FeSO4 ·7H 2 O, FeCl 3 ·6H 2 O was made into an aqueous solution with deionized water aerated with nitrogen for 30 minutes, mixed in a three-necked flask, and under the protection of nitrogen, 6% ammonia water was added dropwise in the three-necked flask, and stirred at a speed of 200 r / min at the same time until the pH of the solution was was 10; reacted at room temperature for 1 hour, and the obtained product was separated by magnetic suction and washed several times, and then dialyzed for 48 hours, then dried in constant temperature and vacuum to obtain black magnetic ferric oxide nanoparticles;

[0034] (2) Dissolve ferroferric oxide magnetic nanoparticles in ethanol, disperse them by ultrasonication for 1h, add 25% ammonia water, TEOS (tetraethyl orthosilicate), react for 1.5h, put the solution in an ultrasonic cleaning tank and ultrasonically for 6h,...

Embodiment 3

[0037] (1) According to the molar ratio of 1:2, FeSO 4 ·7H 2 O, FeCl 3 ·6H 2 O was made into an aqueous solution with deionized water aerated with nitrogen for 30 minutes, mixed in a three-necked flask, and under the protection of nitrogen, 4% ammonia water was added dropwise in the three-necked flask, and stirred at a speed of 300 r / min at the same time until the pH of the solution was for 9. After reacting at room temperature for 3 hours, the obtained product was separated by magnetic absorption and washed with water several times, and then dialyzed for 48 hours, then vacuum-dried at a constant temperature to obtain black magnetic ferric oxide nanoparticles.

[0038] (2) Dissolve ferroferric oxide magnetic particles in ethanol, disperse them by ultrasonication for 1h, add 25% ammonia water, TEOS (tetraethyl orthosilicate), react for 2h, put the solution in an ultrasonic cleaning tank and ultrasonically for 4h, then at 11000rpm Centrifuge at a rotating speed for 20 minute...

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Abstract

The invention provides an amino-functionalization magnetic silicon dioxide-ferroferric oxide composite nanomaterial. The material is characterized in that a microsphere structure is formed as magnetic ferroferric oxide is used as an inner core, silicon dioxide is used as an outer-layer coating material, amino groups with positive charges are used as functionalization modifying groups. The invention also provides a preparation method of the material, and an application of the material in water environment pollutant trace chemistry detection. The material is simple in preparation method, low in cost, high in extraction efficiency and high in adsorptive property, has selectivity on complex organic pollutants, is a reproducible environment-friendly novel material, and can be applied in trace chemistry analysis of a plurality of kinds of complex organic pollutants (particularly pollutants with negative charges) in a water environment.

Description

technical field [0001] The invention belongs to the field of materials, and relates to a composite magnetic nanomaterial, in particular to an amino functionalized magnetic silicon dioxide-ferric oxide composite nanomaterial and a preparation method thereof, and also relates to the chemical trace detection of the nanomaterial in a water environment applications in analysis. Background technique [0002] Magnetic adsorption materials are developed with the development of emerging nanotechnology. Since the 1970s, a variety of nanomagnetic materials have attracted people's attention due to their large specific surface area, abundant active sites and high magnetic properties, such as Fe 3 o 4 and γ-Fe 2 o 3 Wait. [0003] Magnetic Fe3O4 particles are the most commonly used magnetic cores in the preparation of composite materials. At present, the main methods for preparing Fe3O4 nanoparticles are: co-precipitation method, sol-gel method, microemulsion method, and hydrothermal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/28B01J20/30
Inventor 王永花聂阳胡良锋洪诚陆光华
Owner HOHAI UNIV
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