Magnetic nanofiber aerogel for heavy oil separation

Abstract

The invention provides a magnetic nanofiber aerogel for heavy oil separation, which is prepared by the following steps: firstly carrying out melt blending on magnetic particles and nanofibers, then carrying out crosslinking with a crosslinking agent to obtain the magnetic nanofiber aerogel, and then carrying out surface hydrophobic modification treatment to obtain the super-hydrophobic magnetic nanofiber aerogel. The magnetic particles and the nanofibers are subjected to melt blending, so that the magnetic particles can be uniformly and effectively attached to the nanofibers, and the magnetic particles are ensured to be uniformly distributed in the finally prepared aerogel; a hydrophobic resin solution mixed with hydrophobic particles is used for carrying out surface hydrophobic modification on nanofiber aerogel, the hydrophobic particles can be attached to the surface of the aerogel by means of the viscosity of the hydrophobic resin solution, and meanwhile, the hydrophobic particles can be fixed to the surface of the aerogel along with curing of the hydrophobic resin solution on the surface of the aerogel. Through the mode, the magnetic particles in the prepared super-hydrophobic magnetic nanofiber aerogel are uniformly distributed, and the hydrophobicity is uniform.

Description

technical field [0001] The invention relates to the technical field of oil-water separation materials, in particular to a magnetic nanofiber aerogel for the separation of heavy oil. Background technique [0002] Aerogel is a porous material obtained by using freeze-drying or supercritical carbon dioxide drying technology to process hydrogel and replacing the liquid in the hydrogel with gas, which has the network structure and volume characteristics of the hydrogel itself. The unique properties of aerogels and their modifiable properties make them ideal substrates for functionalized composites. Magnetic nanofiber aerogels are aerogels with magnetic properties. The method of imparting magnetic properties to aerogels usually includes a pretreatment method of directly using a mixture of nanofiber solution and nanomagnetic particles to prepare aerogels, and first preparing aerogels and then modifying nanomagnetic particles on them. In the former method, the aggregation of nano-m...

AI Technical Summary

Problems solved by technology

In the above technical solution, magnetic aerogels are prepared by means of the electrostatic force between magnetic ions and airgel substrates, but the aerogels prepared by the above methods are hydrophilic and are not suitable for the field of oil-water separation

[0004] In the prior art, the Chinese patent application number is 201910975905.3, the publication date is January 24, 2020, and the invention patent titled "a superhydrophobic magnetic mixture and its preparation method and application" discloses a superhydrophobic magnetic mixture and Its preparation method and application, utilize CNF aqueous suspension, Fe 3 o 4 The mixed solution of nanoparticles and hydrophobic modifier directly prepares airgel. The airgel prepared in this way is hydrophobic and magnetic. However, due to the immiscibility between the hydrophobic modifier and the nano-CNF aqueous suspension, Therefore, the hydrophobic modifier inside the final airgel is not uniform, making the hydrophobicity of the airgel uneven; in addition, because there is no chemical bond between the magnetic nanoparticles and CNF, the magnetic nanoparticles are only loaded on CNF, so the magnetic nanoparticles on the airgel are easy to drop during use, which eventually affects the magnetic properties of the airgel

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