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A kind of amino functionalized magnetic ferric iron tetroxide nanoparticles and preparation method thereof

A technology of ferric tetroxide and amino functionalization, applied in chemical instruments and methods, iron oxide/iron hydroxide, nanotechnology, etc., can solve the problems of adsorption of unfavorable pollutants, secondary agglomeration, small specific surface area, etc. The effect of abundant surface active sites, high saturation magnetization, and large specific surface area

Active Publication Date: 2021-12-28
青岛斯坦德衡立环境技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are following four disadvantages in this method: 1) The magnetic nanoparticles (magnetic core) particle size prepared by the co-precipitation method is small (between 3-15nm), the magnetic response is weak, and the agglomeration is relatively serious
2) Secondary agglomeration is prone to occur during the silica coating process, and the formed silica-ferric oxide composite nanomaterial has a large size, between 200-500nm, and a relatively small specific surface area, which is not conducive to pollution adsorption
3) Silica coating reduces the content of magnetic substances in nanocomposites, which is not conducive to rapid magnetic separation
These deficiencies in structure, function and its preparation method will have a negative impact on its application as an adsorbent in water treatment.

Method used

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  • A kind of amino functionalized magnetic ferric iron tetroxide nanoparticles and preparation method thereof
  • A kind of amino functionalized magnetic ferric iron tetroxide nanoparticles and preparation method thereof
  • A kind of amino functionalized magnetic ferric iron tetroxide nanoparticles and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0024] (1) Mix 15mmol anhydrous ferric chloride, 5mmol sodium hydroxide, 50mL ethylene glycol and 3.6ml deionized water and transfer to a three-necked flask, mix well, heat up to boiling, then keep boiling and reflux for 8h, stop react, cool to room temperature, separate and wash to obtain ferric oxide nanoparticles. figure 1 Shown is the transmission electron microscope (TEM) photo of the obtained iron ferric oxide nanoparticles. It can be seen from the figure that the average size of the obtained nanoparticles is between 20-40nm, with uniform particle diameter, moderate size, good dispersion and no agglomeration.

[0025] (2) Disperse 0.5 g of the ferric oxide nanoparticles obtained above in 100 ml of water, add 3 ml of APTES, and heat to 65 ° C under mechanical stirring; after 12 hours of reaction, stop stirring, cool to room temperature, separate and wash APTES modified ferric oxide nanoparticles were obtained. figure 2 Shown is a transmission electron microscope (TEM) p...

Embodiment 2

[0028] (1) Mix 30mmol anhydrous ferric chloride, 9.5mmol sodium hydroxide, 100mL ethylene glycol and 5ml deionized water and transfer to a three-necked flask, mix well, heat up to boiling, then keep boiling and reflux for 12h, stop react, cool to room temperature, separate and wash to obtain ferric oxide nanoparticles.

[0029] (2) Disperse 0.5 g of the ferric oxide nanoparticles obtained above in 100 ml of water, add 1 ml of APTES, and heat to 60 ° C under mechanical stirring; after 24 hours of reaction, stop stirring, cool to room temperature, separate and wash APTES modified ferric oxide nanoparticles were obtained.

Embodiment 3

[0031] (1) Mix 30mmol anhydrous ferric chloride, 10.5mmol sodium hydroxide, 100mL ethylene glycol and 6ml deionized water and transfer to a three-necked flask, mix well, heat up to boiling, then keep boiling and reflux for 6h, stop react, cool to room temperature, separate and wash to obtain ferric oxide nanoparticles.

[0032] (2) Disperse 0.5g of the ferric oxide nanoparticles obtained above in 100ml of water, add 5ml of APTES, and heat to 70°C under mechanical stirring; after 24 hours of reaction, stop stirring, cool to room temperature, separate and wash APTES modified ferric oxide nanoparticles were obtained.

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Abstract

The invention discloses an amino functionalized magnetic iron ferric oxide nano particle and a preparation method thereof. The nanoparticle is composed of ferric iron tetroxide nanoparticles (magnetic core) with an average size between 20-40nm and a layer thickness of 1-3-aminopropyltriethoxysilane (APTES) hydrolytic condensation formed on its surface. Amino-functionalized coating composition between 3nm. The nanoparticle preparation method comprises the following steps: 1) using iron trichloride, sodium hydroxide and deionized water in ethylene glycol to prepare ferric oxide nanoparticles as magnetic cores; 2) using the magnetic cores obtained in step 1) Disperse in an aqueous solution, directly add 3-aminopropyltriethoxysilane (APTES) to carry out amino functional modification, and obtain amino functional magnetic ferric oxide nanoparticles. The process of the method is simple and environment-friendly, does not need a silicon dioxide transition layer, and does not need to use an organic solvent and adjust the pH value of the solution. The obtained amino-functionalized magnetic ferric iron tetroxide nanoparticles are uniformly coated, regular in structure, high in magnetic substance content and good in dispersibility, and can be used as an adsorbent for removing pollutants in water.

Description

technical field [0001] The invention belongs to the field of functional nanometer materials, and in particular relates to an amino functionalized magnetic iron ferric oxide nanoparticle and a preparation method thereof. Background technique [0002] In recent years, the application of magnetic nanoparticles as adsorption materials in the field of water treatment has received extensive attention. The magnetic nanoparticles represented by ferroferric oxide are easy to prepare, have large specific surface area, and have superparamagnetism. The adsorbent can be quickly separated from the solution by applying an external magnetic field. The water treatment process based on magnetic nanoparticles generally includes the adsorption of target pollutants by magnetic nanoparticles, the magnetic separation of magnetic nanoparticles, and the desorption and reuse of magnetic nanoparticles. Due to the limited adsorption capacity of Fe3O4 nanoparticles, surface modification is usually requ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/48C01G49/08B82Y40/00B82Y30/00
CPCC02F1/488C01G49/08B82Y30/00B82Y40/00C01P2004/64C01P2004/52
Inventor 万家齐张博文王宇飞张娇陈克正
Owner 青岛斯坦德衡立环境技术研究院有限公司
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