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Chitosan/cellulose composite separation membrane and preparation method thereof

A technology of cellulose and chitosan is applied in the field of chitosan/cellulose composite separation membrane and its preparation, and achieves the effects of good biocompatibility, good mechanical strength, simple and environmentally friendly membrane-making process

Inactive Publication Date: 2013-06-12
FUJIAN AGRI & FORESTRY UNIV
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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 use of zinc chloride aqueous solution to dissolve chitosan and cellulose at the same time, and prepare a composite separation membrane from the resulting solution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 65 g ZnCl 2 Dissolved in deionized water to make 65 wt% ZnCl 2 aqueous solution, and then add a total mass fraction of 4 wt% chitosan (relative molecular mass Mw 2×10 5 Da, the degree of deacetylation is about 90%, Zhejiang Jinke Biochemical Co., Ltd.) and bamboo pulp cellulose (Fujian Shaowu Bamboo Pulp Factory), the mass fraction ratio of raw materials is chitosan / bamboo pulp cellulose = 1:6, in With rapid stirring at 80°C, the mixture gradually became a homogeneous solution. The above solution was centrifuged and defoamed, scraped on a hot glass plate to form a film, and then quickly immersed in a water coagulation bath for 20 minutes to obtain an asymmetric film. The newly prepared asymmetric film was washed with flowing tap water and deionized water to remove residual solvent. Dry at a temperature of 25°C and a relative humidity of 85%, and set aside. The thickness of the composite separation membrane was 60 μm, the tensile strength was 40 MPa, and the lethali...

Embodiment 2

[0040] 72 g ZnCl 2 Dissolved in deionized water to make 72 wt% ZnCl 2 aqueous solution, and then add 4 wt% chitosan (relative molecular mass M w 2×10 5 Da, the degree of deacetylation is about 90%, Zhejiang Jinke Biochemical Co., Ltd.) and cotton pulp cellulose (Jiangxi Jiujiang Chemical Fiber Factory), the mass fraction ratio of raw materials is chitosan / cotton pulp cellulose = 1:6, at 80 With rapid stirring at ℃, the mixture gradually became a homogeneous solution. The above solution was centrifuged and defoamed, scraped on a hot glass plate to form a film, and then quickly immersed in a water coagulation bath for 20 minutes to obtain an asymmetric film. The newly prepared asymmetric film was washed with flowing tap water and deionized water to remove residual solvent. Dry at a temperature of 30°C and a relative humidity of 70%, and set aside. The thickness of the composite separation membrane is 50μm, the tensile strength is 60MPa, and the lethality to Escherichia col...

Embodiment 3

[0042] 72 g ZnCl 2 Dissolved in deionized water to make 72 wt% ZnCl 2 aqueous solution, and then add 4 wt% chitosan (relative molecular mass M w 2×10 5 Da, the degree of deacetylation is about 90%, Zhejiang Jinke Biochemical Co., Ltd.) and ramie cellulose (Hebei Jigao Chemical Fiber Co., Ltd.), the mass fraction ratio of raw materials is chitosan / ramie cellulose = 1:6, at 80 With rapid stirring at ℃, the mixture gradually became a homogeneous solution. The above solution was centrifuged and defoamed, scraped on a hot glass plate to form a film, and then quickly immersed in a water coagulation bath for 20 minutes to obtain an asymmetric film. The newly prepared asymmetric film was washed with flowing tap water and deionized water to remove residual solvent. Dry at a temperature of 30 °C and a relative humidity of 60% for later use. The thickness of the composite separation membrane was 55 μm, the tensile strength was 50 MPa, and the lethality to Escherichia coli and Staph...

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Abstract

The invention discloses a chitosan / cellulose composite separation membrane and a preparation method thereof. The preparation method comprises the following step of: directly dissolving chitosan and cellulose by taking a zinc chloride aqueous solution as a solvent; and carrying out an immersion gel method to prepare the chitosan / cellulose composite separation membrane. The prepared composite separation membrane comprises a microporous membrane, an ultrafiltration membrane, a nanofiltration membrane, a reverse osmosis membrane or a dense membrane. The chitosan / cellulose composite separation membrane has the thickness of 20-100 mu m and the tensile strength of 30-100MPa, the fatality rate of the chitosan / cellulose composite separation membrane for escherichia coli and staphylococcus aureus are 30-90% and 30-97%, respectively. The preparation method is simple and easy to operate, low in price of raw materials and easy in raw material recycling, environmentally-friendly and free of pollution in the process.

Description

technical field [0001] The invention relates to a chitosan / cellulose composite separation membrane and a preparation method thereof, which belongs to the field of natural polymers, and also belongs to the fields of chemistry, agriculture and environmental engineering. Background technique [0002] Research on membrane separation technology has attracted worldwide attention and has great potential in wastewater recycling, drinking water purification, seawater desalination and separation of substances. However, most membranes are prepared from non-biodegradable petrochemical feedstocks. These non-degradable plastic materials disturb and destroy the ecosystem as disposable items. [0003] Renewable resources can be regarded as ideal materials for membrane production. Cellulose is a natural biomacromolecule, which is often used to prepare degradable films, such as patent 02132866.8 and patent 200710021069.2. However, the antibacterial properties of cellulose films are poor. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D71/10B01D67/00B01D53/22C02F1/44
CPCY02A20/131
Inventor 陈礼辉林珊黄六莲曹石林刘凯
Owner FUJIAN AGRI & FORESTRY UNIV
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