Macroporous reticular polyvinyl alcohol foam and preparation thereof

A polyvinyl alcohol and polyvinyl alcohol gel technology, which is applied in the field of bioengineering, can solve the problems of poor impact resistance of polymer materials, short service life of immobilized microorganisms, unfavorable mass transfer of microorganisms, etc., and achieves good water resistance, Toxic elimination, obvious effect

Inactive Publication Date: 2009-02-11
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the above immobilized microorganism immobilization methods are limited to the embedding method. The embedding method has the characteristics of simple operation, mild immobilization conditions, and little influence on the activity of microbial cells. The hindrance is not conducive to mass transfer, and the impact resistance of hydrogel polymer materials is not good, and the service life of the obtained immobilized microorganisms is short, which limits its wide application in the field of wastewater treatment

Method used

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  • Macroporous reticular polyvinyl alcohol foam and preparation thereof
  • Macroporous reticular polyvinyl alcohol foam and preparation thereof
  • Macroporous reticular polyvinyl alcohol foam and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Put PVA, limestone and water in a three-necked flask at a mass ratio of 18:10:100 for mixing, heat, stir, and fully dissolve the mixture in a boiling water bath. Stop heating after the PVA is completely dissolved and the system is evenly mixed, and cool to room temperature under stirring. At this time, the system is in the form of white sol with relatively high viscosity.

[0034] The above sol was added with 34ml of hydrochloric acid solution with a mass concentration of 15% under vigorous stirring, the mixture began to foam, and when the volume expanded to 3 times the original volume, it began to freeze. The freezing method is: freeze at -20°C for 12 hours, then thaw naturally at room temperature for 3 hours, and cycle freezing and thawing three times in this way to generate a large-pore mesh PVA gel foam; cut the gel foam into 2×2×2cm Small pieces, continue to soak in hydrochloric acid with a mass concentration of 1% until no bubbles are formed.

[0035] Put the cl...

Embodiment 2

[0037] Put PVA, limestone and water in a three-necked flask at a mass ratio of 18:10:100 for mixing, heat, stir, and fully dissolve the mixture in a boiling water bath. Stop heating after the PVA is completely dissolved and the system is evenly mixed, and cool to room temperature under stirring. At this time, the system is in the form of white sol with relatively high viscosity.

[0038] The above sol was added with 34ml of hydrochloric acid solution with a mass concentration of 15% under vigorous stirring, the mixture began to foam, and when the volume expanded to 3 times the original volume, it began to freeze. The freezing method is: freeze at -20°C for 12 hours, then thaw naturally at room temperature for 3 hours, and cycle freezing and thawing three times in this way to generate a large-pore mesh PVA gel foam; cut the gel foam into 2×2×2cm Small pieces, continue to soak in hydrochloric acid with a mass concentration of 1% until no bubbles are formed.

[0039] Soak the g...

Embodiment 3

[0041] Put PVA, limestone and water in a three-necked flask at a mass ratio of 18:10:100 for mixing, heat, stir, and fully dissolve the mixture in a boiling water bath. Stop heating after the PVA is completely dissolved and the system is evenly mixed, and cool to room temperature under stirring. At this time, the system is in the form of white sol with relatively high viscosity.

[0042] The above sol was added with 34ml of hydrochloric acid solution with a mass concentration of 15% under vigorous stirring, the mixture began to foam, and when the volume expanded to 3 times the original volume, it began to freeze. The freezing method is: freeze at -20°C for 12 hours, then thaw naturally at room temperature for 3 hours, and cycle freezing and thawing three times in this way to generate a large-pore mesh PVA gel foam; cut the gel foam into 2×2×2cm Small pieces, continue to soak in hydrochloric acid with a mass concentration of 1% until no bubbles are formed.

[0043] The gel fo...

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Abstract

The invention provides a method for preparing a macroreticular polyvinyl alcohol foam carrier, which comprises the steps: polyvinyl alcohol, limestone and water are mixed and stirred to lead the polyvinyl alcohol to be fully and evenly dissolved; the mixture is added with dilute hydrochloric acid for acidification and is frothed to have foramen; by adopting the circulation of freezing-unfreezing, and refreezing-unfreezing again, macroreticular polyvinyl alcohol gel foam is formed; then, the polyvinyl alcohol gel foam is cut into pieces and is dipped into the dilute hydrochloric acid with the mass concentration of 0.5-1% until no bubble is generated; the polyvinyl alcohol is caused to form more stable cross-linked structure by chemical crosslinking reaction; after that, the polyvinyl alcohol is soaked in water to be washed to be neutrality, so that the white macroreticular polyvinyl alcohol foam carrier is obtained. The macroreticular polyvinyl alcohol foam carrier prepared by the invention has stable macroreticular structure, takes on good hydrophilicity, physical and chemical durability as well as biological degradability resistance, is applicable to immobilized enzyme and microorganism to form a bioreactor with multiple bed types, and can be used in the fields of modern biological engineering such as sewage disposal, etc.

Description

technical field [0001] The invention belongs to the technical field of bioengineering and relates to the preparation of a biological carrier, in particular to a macroporous reticular polyvinyl alcohol foam carrier and its preparation. This carrier is mainly used to immobilize enzymes and microorganisms to form various bed bioreactors. Background technique [0002] my country's polyvinyl alcohol (PVA) industry has a complete production line of raw materials (with calcium carbide acetylene, natural gas acetylene and petroleum ethylene lines), and its production equipment capacity and annual output rank first in the world. Because the PVA material is non-toxic to biologically active substances, it has a series of advantages such as cheap and easy to obtain. And because polyvinyl alcohol has excellent hydrophilicity and good reactivity, after chemical crosslinking or hardening modification, its mechanical strength and chemical stability will be significantly improved, and its r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12N11/04C12N11/08C08J9/30C08J9/36C08L29/04C08K3/38C08K5/07C08K5/1515
Inventor 李彦锋白雪门学虎杨柳青
Owner LANZHOU UNIVERSITY
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