A kind of silicon dioxide/cellulose magnetic foam and its preparation method

A technology of silica and magnetic foam, applied in chemical instruments and methods, alkali metal oxides/hydroxides, inorganic chemistry, etc., to achieve the effects of light weight, large oil absorption, and strong applicability

Active Publication Date: 2019-05-14
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no report on the magnetic foam of organic / inorganic fiber composite materials at home and abroad.

Method used

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  • A kind of silicon dioxide/cellulose magnetic foam and its preparation method
  • A kind of silicon dioxide/cellulose magnetic foam and its preparation method
  • A kind of silicon dioxide/cellulose magnetic foam and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Weigh 250 mg of silica fiber and 250 mg of fibrillated cellulose, add 100 ml of deionized water, and stir for 3 hours with a high-speed mixer at a speed of 2000 rpm to fully mix the silica fiber and cellulose Disperse to form a silica fiber / cellulose mixed solution; add 25 microliters of glutaraldehyde and 500 mg of ferric oxide nanoparticles to the mixed solution, use a glass stirring rod to continue stirring at room temperature for 2 hours, and then place in an ice bath Ultrasound for 2 hours to fully disperse the nanoparticles; adjust the pH of the system to 5 with dilute sulfuric acid, and cross-link the mixed solution at 75°C for 3 hours to obtain a mixed solution hydrogel; freeze the obtained hydrogel at -80°C After 6 hours, the moisture in the gel was removed by freeze-drying to obtain a three-dimensional foam material.

[0041] (2) Seal the obtained three-dimensional foam and 5 microliters of tridecafluorooctyltriethoxysilane coupling agent in a glass dish, ...

Embodiment 2

[0046](1) Weigh 250 mg of silica fiber and 125 mg of fibrillated cellulose, add 60 ml of deionized water, and stir for 2 hours at a speed of 3000 rpm with a high-speed mixer to fully mix the silica fiber and cellulose Disperse to form a silica fiber / cellulose mixed solution; add 34 microliters of glutaraldehyde and 187.5 mg of ferric oxide nanoparticles to the mixed solution, use a glass stirring rod to continue stirring at room temperature for 1 hour, then place in an ice bath Ultrasound for 1 hour to fully disperse the nanoparticles; adjust the pH of the system to 5.5 with dilute sulfuric acid, and cross-link the mixed solution at 60°C for 2 hours to obtain a mixed solution hydrogel; freeze the obtained hydrogel at -50°C After 10 hours, the water in the gel was removed by freeze-drying to obtain a three-dimensional foam material.

[0047] (2) Seal the obtained three-dimensional foam and 37.5 microliters of tridecafluorooctyltrimethoxysilane coupling agent in a glass dish, pl...

Embodiment 3

[0053] (1) Weigh 250 mg of silica fiber and 500 mg of fibrillated cellulose, add 75 ml of deionized water, and stir for 1 hour at a speed of 5000 rpm with a high-speed mixer to fully mix the silica fiber and cellulose Disperse to form a silica fiber / cellulose mixture. Add 340 microliters of 50wt% glutaraldehyde aqueous solution and 1500 mg of ferric oxide nanoparticles to the mixed solution, use a glass stirring rod to continue stirring at room temperature for 3 hours, and then ultrasonically disperse the nanoparticles in an ice bath for 3 hours; The pH value of the system was adjusted to 4.5 by dilute sulfuric acid, and the mixed solution was cross-linked at 80°C for 4 hours to obtain the mixed solution hydrogel; the obtained hydrogel was frozen at -50°C for 10 hours, and then the gel was freeze-dried Moisture is removed to obtain a three-dimensional foam.

[0054] (2) Seal the obtained three-dimensional foam and 70 microliters of tridecafluorooctyltrimethoxysilane coupling ...

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Abstract

The invention discloses silicon dioxide / cellulose magnetic foam and a preparation method thereof. The method comprises the following steps: forming a fiber foam material with a three-dimensional structure by using inorganic silicon dioxide fibers and fibrillation cellulose extracted from plants by a chemical cross-linking method; and introducing ferroferric oxide magnetic nanoparticles and carrying out surface fluorinated modification to obtain a magnetic silicon dioxide / cellulose foam material. The silicon dioxide / cellulose foam has good strength and elasticity, is light in weight and high in oil absorption amount, can be induced to move by a magnetic field, can be used repeatedly, is high in durability, and has high applicability on absorption of long-distance large-area oil contamination. The process of the preparation method is simple and gentle, and the silicon dioxide / cellulose magnetic foam is suitable for mass production.

Description

technical field [0001] The invention belongs to the field of organic / inorganic composite functional materials, and in particular relates to a silicon dioxide / cellulose magnetic foam and a preparation method thereof. Background technique [0002] In recent years, oil pollution and various organic solvents have become increasingly serious water pollution, and it is of great significance to develop new types of high-efficiency and adaptable oil pollution treatment materials. An ideal oil-absorbing material needs to have better hydrophobic and lipophilic properties, faster adsorption rate, higher absorption capacity, easy oil recycling, and reusable performance of oil-absorbing materials. Traditional powder, particle and film nanocomposite oil-absorbing materials have the problems of low adsorption rate and difficulty in recycling. The porous foam material with three-dimensional structure widely developed in recent years has become a good oil-absorbing material. At present, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28
CPCB01J20/103B01J20/24B01J20/28009B01J20/28045C02F1/28C02F1/281C02F1/286
Inventor 米皓阳经鑫
Owner SOUTH CHINA UNIV OF TECH
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