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Magnetic nano composite capable of absorbing perfluorochemicals and preparation method thereof

A perfluorinated compound, magnetic nanotechnology, applied in the directions of alkali metal compounds, chemical instruments and methods, alkali metal oxides/hydroxides, etc. problem, to achieve the effect of fast surface adsorption kinetic characteristics, simple and fast method, and high adsorption capacity

Inactive Publication Date: 2015-04-08
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of the above-mentioned functional materials is relatively cumbersome, and the materials can only selectively recognize perfluoroalkyl chains, but ignore the interaction with hydrophilic functional groups, so the adsorption capacity for perfluorinated compounds is low.

Method used

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  • Magnetic nano composite capable of absorbing perfluorochemicals and preparation method thereof
  • Magnetic nano composite capable of absorbing perfluorochemicals and preparation method thereof
  • Magnetic nano composite capable of absorbing perfluorochemicals and preparation method thereof

Examples

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Effect test

Embodiment 1

[0021] Preparation of High Adsorption Capacity Magnetic Nanocomposites for Selective Recognition of Perfluorinated Compounds

[0022] (1) Hydrophilic groups on the surface of magnetic nanoparticles: specific preparation steps: Fe 3 o 4 Nanoparticles are added to 0.2-0.4mol / L polyacrylic acid aqueous solution, the initial concentration of nanoparticles is 4-12g / L, continuous stirring and ultrasonication for 30-60min at 25-40°C, and repeated washing of the product with deionized water to remove unbound Polyacrylic acid can be dried in vacuum for 12-24 hours to obtain hydrophilic Fe 3 o 4 nanoparticles.

[0023] Depend on figure 2 (A) It can be seen that the morphology of each magnetic nanoparticle is clearly visible, the particle size is between 10-20nm, and there is no or little overlap between the particles. Therefore, the modification of the hydrophilic group effectively avoids the easy aggregation of the nanoparticles. shortcoming. image 3 (A)1722cm -1 shows an obvi...

Embodiment 2

[0031] 0.4g Fe 3 o 4 Nanoparticles were added to 100mL 0.2mol / L polyacrylic acid aqueous solution, continuously stirred and ultrasonicated for 30min at 30°C, the resulting product was repeatedly washed with deionized water to remove unbound polyacrylic acid, and vacuum dried for 12h to obtain Fe with hydrophilic activity. 3 o 4 nanoparticles. Mix 0.1 mmol (3-aminopropyl) triethoxysilane, 0.1 mmol 1H, 1H, 2H, 2H-perfluorooctyl triethoxysilane and 0.8 mmol tetraethyl orthosilicate as a precursor solution, add to 100mL 2g / L hydrophilic Fe 3 o 4 In the nanoparticle ethanol / water (3:1, v / v) dispersion system, add 1mL ammonia solution to the reaction system at the same time, continue to stir gently at 30°C for 6h, and mix ethanol / water (1:1, v / v) The solution repeatedly washes the product to remove unreacted chemicals, and vacuum-dries for 12 hours to obtain a high-adsorption-capacity magnetic nanocomposite material that selectively recognizes perfluorinated compounds.

Embodiment 3

[0033] 0.8g Fe 3 o 4 Nanoparticles were added to 100mL 0.3mol / L polyacrylic acid aqueous solution, continuously stirred and ultrasonicated for 45min at 30°C, the resulting product was repeatedly washed with deionized water to remove unbound polyacrylic acid, and vacuum dried for 12h to obtain Fe with hydrophilic activity. 3 o 4 nanoparticles. Mix 0.15 mmol (3-aminopropyl) triethoxysilane, 0.15 mmol 1H, 1H, 2H, 2H-perfluorooctyl triethoxysilane and 1.5 mmol tetraethyl orthosilicate as a precursor solution, add to 100mL 4g / L hydrophilic Fe 3 o 4 In the nanoparticle ethanol / water (3:1, v / v) dispersion system, add 1.25mL ammonia solution to the reaction system at the same time, keep stirring gently at 30°C for 9h, ethanol / water (1:1, v / v) The mixed solution repeatedly washes the product to remove unreacted chemicals, and vacuum-dries for 12 hours to obtain a magnetic nanocomposite material with high adsorption capacity that selectively recognizes perfluorinated compounds.

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Abstract

The invention belongs to the novel material field, and relates to a magnetic nano composite, and especially relates to the magnetic nano composite with high adsorption capacity capable of selectively indentifying perfluorochemicals and a preparation method thereof, which can solve the problem of single identification mechanism and non-ideal selectivity of the adsorbent in prior art. The method is characterized in that the hydrophilic group-modified Fe3O4 nano particles can be taken as a substrate, a one step method is used for synthesizing perfluorooctane and amido-functionalized magnetic nano composite, and the preparation method has the advantages of simple and rapid process, low cost and easy operation. The perfluorochemicals identification by the material is based on fluorine-fluorine interaction and electrostatic attraction, specific recognition capability and adsorption capacity on the target analysis objects can be obviously increased; the prepared magnetic nano composite is in a core-shell structure, surface adsorption endows rapid adsorption power characteristic to the material, the material has good magnetic responsibility, so that the magnetic nano composite has wide application prospect and development space in environment monitoring and pollution controlling fields.

Description

technical field [0001] The invention belongs to the field of new materials, and in particular relates to a preparation method of a high-adsorption-capacity magnetic nanocomposite material which selectively recognizes perfluorinated compounds. Background technique [0002] Perfluorinated compounds are man-made chemicals. In its molecular structure, one end is a hydrophilic functional group, mainly carboxyl and sulfonic acid groups, and the hydrogen atoms in the alkyl chain at the other end are all replaced by fluorine atoms. Therefore, perfluorinated compounds are endowed with unique physical and chemical properties, such as surface activity, hydrophobicity and oil repellency, heat resistance, acid resistance and biodegradation resistance, etc., and are widely used in textiles, papermaking, leather, interior decoration, food packaging, fire protection and personal daily necessities and other fields. However, relevant animal experiments have shown that perfluorinated compoun...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/28B01J20/30
CPCB01J20/223B01J20/28009B01J20/3204B01J2220/46
Inventor 梅素容周雨笋荆涛周廷廷陶芸周宜开
Owner HUAZHONG UNIV OF SCI & TECH
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