Method for preparing magnetic cellulose aerogel from wastepaper
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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
Active Publication Date: 2014-08-13
HARBIN INST OF TECH
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[0004] Waste paper is one of the sources of pollution that plagues people in daily life. People usually use methods such as incineration and landfill to dispose of it, which wastes resources and pollutes the environment.
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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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Abstract
The invention provides a method for preparing magnetic cellulose aerogel from wastepaper, and relates to an aerogel preparation method. The invention aims at providing a method for preparing regenerated magnetic cellulose aerogel from the wastepaper. According to the method, the wastepaper material in life is used as a raw material for preparing a green, ultralight and highly porous aerogel oil absorbing material. The method comprises the following steps: step one. preparing regenerated cellulose from wastepaper; step two. preparing regenerated cellulose aerogel; step three. carrying out hydrophobic modification on the regenerated cellulose aerogel; and step four. preparing the regenerated magnetic cellulose aerogel oil absorbing material. The method has the advantages that the magnetic cellulose aerogel oil absorbing material is prepared from the wastepaper in life, the material can be greatly saved, the waste is turned into wealth, the regenerated magnetic cellulose aerogel is simple in a preparation technology, low in cost, convenient to use, capable of effectively absorbing multiple organic solvents and oil matters leaked in water, and high in absorption rate, the oil absorption is thorough, the oil absorbing material is nontoxic and harmless and causes very little secondary pollution, and an adopted magnetic collection method is simple, convenient and easy to use.
Description
technical field [0001] The invention relates to a method for preparing airgel, in particular to a method for preparing magnetic cellulose airgel from waste paper. Background technique [0002] Frequent oil spills in water bodies cause numerous negative effects in the aquatic environment. Therefore, there is an urgent need to develop a fast, efficient and economical absorbent to clean up oil spills from the water surface. After long-term exploration and efforts, the current treatment methods for oil spill accidents mainly include physical, biological and chemical methods. Chemical methods include oil dispersants, dispersants, oil coagulants, etc., but oil dispersants will cause secondary pollution to the sea surface . Physical methods mainly include oil-absorbing felts, oil skimmers, oil-absorbing agents, etc., but this method is good for oils with high viscosity such as crude oil, but for light oils such as gasoline, coal, and diesel, the diffusion speed on the sea surface...
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