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A kind of efficient oil-water separation chitosan sponge and preparation method thereof

A technology of oil-water separation and chitosan, which is applied in the direction of separation methods, liquid separation, chemical instruments and methods, etc., can solve the problem of less oil adsorption, and achieve the effects of strong oil retention capacity, low cost, and small environmental hazards

Active Publication Date: 2019-11-19
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the chitosan sponge prepared by the freeze-drying method has a hydrophilic surface property, absorbs more water in the oil-water mixture, has a small amount of oil adsorption, and does not have any oil-water selective adsorption.
So far, there is no suitable technical method to quickly prepare lipophilic and hydrophobic chitosan sponge materials for oil-water separation

Method used

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  • A kind of efficient oil-water separation chitosan sponge and preparation method thereof
  • A kind of efficient oil-water separation chitosan sponge and preparation method thereof
  • A kind of efficient oil-water separation chitosan sponge and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Fully dissolve 2g of chitosan, 2mL of hydrochloric acid, and 100mL of deionized water under mechanical stirring (400r / min, stirring for 120min) to obtain a transparent chitosan solution; freeze the obtained chitosan solution at -20°C for 4h to form ice, and then freeze-dried at -56°C to obtain a chitosan porous sponge; the above 1cm 3 Soak the sponge in ethanol ammonia water mixture containing 0.2g tetramethoxysilane and 0.5g hexadecyltrimethoxysilane (9mL ethanol + 1mL ammonia water), carry out polymerization reaction at 50°C for 4h, and dry the sponge at 40°C for 12h , to obtain chitosan lipophilic hydrophobic sponge.

[0041] attached figure 1 It is the scanning electron micrograph of the chitosan porous sponge that embodiment 1 prepares. from figure 1 It can be seen that the pore structure is rich, and the pore size is between 250 and 500 μm, which is suitable for oil-water separation.

[0042] The obtained chitosan lipophilic and hydrophobic sponge was carried ...

Embodiment 2

[0044] Fully dissolve 1g of chitosan, 1.5mL of glacial acetic acid, and 100mL of deionized water under mechanical stirring (600r / min, stirring for 240min) to obtain a transparent chitosan solution; freeze the resulting chitosan solution at -40°C for 6h Freeze into ice, and then freeze-dry at -80°C to obtain a chitosan porous sponge; the above 1cm 3Soak the sponge in ethanol-ammonia water mixture containing 0.4g dimethylsiloxane and 0.6g vinyltrimethoxysilane (ethanol 8mL + ammonia water 2mL), polymerize at 60°C for 10h, dry the sponge at 60°C for 8h, Obtain chitosan lipophilic hydrophobic sponge.

[0045] attached figure 2 The photos of the suspension situation in water before and after polysilane modification of the porous chitosan sponge prepared in Example 2. It can be seen that before modification, chitosan is hydrophilic and sinks into water. The modified chitosan sponge completely floated on the water surface, indicating its hydrophobic character.

[0046] The obtai...

Embodiment 3

[0048] Fully dissolve 0.5g chitosan, 1.5mL lactic acid, and 100mL deionized water under mechanical stirring (1000r / min, stirring for 480min) to obtain a transparent chitosan solution; freeze the obtained chitosan solution at -60°C for 8h Freeze into ice, and then freeze-dry at -80°C to obtain a chitosan porous sponge; the above 1cm 3 Soak the sponge in ethanol ammonia water mixture containing 0.5g propyltrimethoxysilane and 0.5g tetramethoxysilane (9.5mL ethanol + 0.5mL ammonia water), carry out polymerization reaction at 80°C for 5h, and dry the sponge at 80°C for 4h , to obtain chitosan lipophilic hydrophobic sponge.

[0049] The obtained chitosan lipophilic hydrophobic sponge is carried out toluene, sunflower oil, dichloromethane, normal hexane, chloroform, the oil absorption multiple determination of acetone, the sponge is soaked in the above-mentioned liquid, after weighing the dry weight of contrast sponge and adsorption equilibrium the weight of.

[0050] attached i...

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Abstract

The invention belongs to the field of chitosan materials, and discloses an efficientoil-water separated chitosan sponge and a preparation method thereof. The preparation method comprises the following steps of (1) dissolving chitosan into acid liquor to obtain a chitosan solution, and freeze-drying to obtain chitosan porous sponge; (2) through polymerization reaction of an in-situ silicone monomer, coating organo-siloxane on the surface of the chitosan porous sponge, and drying to obtain the efficient oil-water separated chitosan sponge. According to the efficient oil-water separated chitosan sponge and the preparation method thereof provided by the invention, the chitosan porous sponge is obtained through freeze drying, a layer of organo-siloxane coating is applied on the surface of a framework of the chitosan sponge through polymerization reaction of the in-situ silicone monomer, and an oleophylic hydrophobic material with organo silicone on the surface is formed, so that the efficient oil-water separated chitosan sponge with super-hydrophobic and super-oleophilic characteristics is prepared, has a good mechanical property, and can meet the practical application requirement. The efficient oil-water separated chitosan sponge has higher oil absorption times on multiple oil, can be used for preparing a large-volume hydrophobic oleophylic sponge, is high in oil retaining ability, and is applied in oil-water separation.

Description

technical field [0001] The invention belongs to the field of chitosan materials, in particular to a high-efficiency oil-water separation chitosan sponge and a preparation method thereof. Background technique [0002] In recent years, more and more environmental problems, such as water pollution caused by oil spills, industrial discharges of wastewater containing organic dyes or heavy metal ions, etc. have become important global issues, causing hundreds of billions of economic losses every year, resulting in difficult-to-repair ecological damage, It poses a huge threat to marine life and human health. A lot of manpower and material resources have been invested in wastewater treatment such as oil pollution, but the results are not ideal. Most of the materials currently used for oil absorption are non-biodegradable, and a large amount of use will cause white pollution. It is necessary and urgent to develop new, efficient, safe, environmentally friendly, and abundant natural ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/28C08J9/42C08J9/40C02F1/40C02F1/28C08L5/08
CPCC02F1/285C02F1/40C08J9/28C08J9/405C08J9/42C08J2305/08
Inventor 刘明贤周长忍
Owner JINAN UNIVERSITY
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