Method for preparing magnetic cellulose aerogel from wastepaper
A cellulose airgel and aerogel technology, applied in the field of airgel preparation, can solve the problems of environmental pollution, waste of resources, etc., and achieve the effects of high absorption rate, small secondary pollution, and easy collection
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specific Embodiment approach 1
[0023] Specific Embodiment 1: In this embodiment, waste paper is reused to prepare regenerated cellulose, and then regenerated cellulose hydrogel is prepared, and cellulose airgel is prepared by freeze-drying, which can be used as a hydrogel after hydrophobic and magnetic modification. Effective oil spill absorbent use. Hydrophobic modification adopts methyltrimethoxysilane to coat the surface of cellulose airgel, which improves the strength of its network structure while improving its hydrophobicity and lipophilicity. The specific operation steps are as follows:
[0024] Step 1. Preparation of regenerated cellulose from waste paper:
[0025] The waste paper is smashed and washed, dissolved in water to form a hydrogel, and the precipitated impurities are removed.
[0026] For hydrolysis in different acid and alkali reagents, choose to hydrolyze in acid first, then reflux with alkali solution, and finally bleach and dry to extract the cellulose in the raw material. Under...
specific Embodiment approach 2
[0035] Specific embodiment two: In this embodiment, the magnetic regenerated cellulose airgel oil-absorbing material is prepared according to the following steps:
[0036] Step 1. Preparation of regenerated cellulose from waste paper:
[0037] The waste paper is smashed and washed, dissolved in water to form a hydrogel, and the precipitated impurities are removed.
[0038]For hydrolysis in different acid and alkali reagents, choose to hydrolyze in acid first, then reflux with alkali solution, and finally bleach and dry to extract the cellulose in the raw material. Under hydrolysis conditions, crush the raw materials into 0.5~1cm long pieces, put them into a flask, according to the weight of raw materials: solution volume = 1:20, add acid for immersion, boil and reflux under normal pressure for 6 hours, then wash until neutral and grind , to be hydrolyzed by alkali. Put the raw material back into the flask after being hydrolyzed by acid, add an alkali solution with the sa...
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