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A preparation method of zinc phosphate-containing alginate hydrogel antibacterial filter membrane

A technology of alginate and zinc phosphate, which is applied in the fields of functional materials and membrane separation, antibacterial, hydrogel, and filtration membranes, and can solve the problems of low strength, poor hydrophilicity, and intolerance of traditional membranes pollution and other issues

Active Publication Date: 2021-11-09
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the deficiencies of the prior art, the technical problems to be solved by the present invention are traditional membranes not resistant to pollution, poor hydrophilicity, low strength of calcium alginate hydrogel filtration membrane, easy to be degraded by bacteria, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] a) preparing a mixture aqueous solution of diammonium hydrogen phosphate with a mass percentage concentration of 0.1% and sodium alginate with a mass percentage concentration of 0.2%, and standing for defoaming to obtain a casting solution;

[0019] b) preparing an aqueous zinc chloride solution with a mass percentage concentration of 0.2% as the first coagulation bath; preparing an aqueous calcium chloride solution with a mass percentage concentration of 0.2% as the second coagulation bath;

[0020] c) Pour the casting solution obtained in step a) onto a dry and clean glass plate, scrape it flat with a glass rod with a diameter of 20 μm copper wires wound at both ends, and then immediately put the glass plate and the scraped film into step b) Soak in the obtained first coagulation bath for 5min to obtain the zinc alginate / zinc phosphate hydrogel film; while zinc chloride reacts with sodium alginate to generate zinc alginate hydrogel, in the zinc alginate hydrogel and ph...

Embodiment 2

[0023] a) preparing a mixture aqueous solution of disodium hydrogen phosphate with a mass percentage concentration of 20% and sodium alginate with a mass percentage concentration of 8%, and standing for defoaming to obtain a casting solution;

[0024] b) preparing an aqueous zinc nitrate solution with a concentration of 20% by mass as the first coagulation bath; preparing an aqueous solution of calcium nitrate with a concentration of 20% by mass as the second coagulation bath;

[0025] c) Pour the casting solution obtained in step a) onto a dry and clean glass plate, scrape it flat with a glass rod with a diameter of 1500 μm copper wire wound at both ends, and then immediately put the glass plate and the scraped film into step b) Soak in the obtained first coagulation bath for 240min to obtain a zinc alginate / zinc phosphate hydrogel film; while zinc nitrate reacts with sodium alginate to generate zinc alginate hydrogel, in the zinc alginate hydrogel and hydrogen phosphate Diso...

Embodiment 3

[0028] a) preparing a mixed aqueous solution of dipotassium hydrogen phosphate with a mass percentage concentration of 16% and sodium alginate with a mass percentage concentration of 6%, and standing for defoaming to obtain a casting solution;

[0029] b) preparing an aqueous solution of zinc sulfate with a mass percentage concentration of 16% as the first coagulation bath; preparing an aqueous solution of calcium dihydrogen phosphate with a mass percentage concentration of 16% as the second coagulation bath;

[0030]c) Pour the casting solution obtained in step a) onto a dry and clean glass plate, scrape it flat with a glass rod with a diameter of 1000 μm copper wire wound at both ends, and then immediately put the glass plate and the scraped film into step b) Soak in the obtained first coagulation bath for 210min to obtain zinc alginate / zinc phosphate hydrogel film; while zinc sulfate reacts with sodium alginate to form zinc alginate hydrogel, in the zinc alginate hydrogel an...

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PUM

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Abstract

The invention discloses a preparation method of an alginate hydrogel antibacterial filter membrane containing zinc phosphate. First, the soluble phosphate and sodium alginate are fully mixed and dissolved to obtain a casting solution. The casting solution is scraped into a film and immersed in a soluble zinc salt solution to fully cross-link, and at the same time as the zinc alginate hydrogel is formed, zinc phosphate is generated in situ in the hydrogel. Then the obtained zinc alginate hydrogel film containing zinc phosphate is soaked in an aqueous solution of soluble calcium salt, and calcium ions take away part of the zinc ions in zinc alginate to form calcium alginate, thereby obtaining zinc phosphate-containing alginate water Gel antibacterial filter membrane. The in situ generated phosphate in the hydrogel improves the mechanical properties of the alginate hydrogel and reduces the swelling performance of the hydrogel, and zinc phosphate endows the alginate hydrogel with good antibacterial properties. The filter membrane has good application prospects in the fields of dye desalination, printing and dyeing wastewater decolorization, protein and polypeptide purification, and the like.

Description

technical field [0001] The invention relates to a preparation method of an alginate hydrogel antibacterial filter membrane containing zinc phosphate, and belongs to the field of functional materials and membrane separation. [0002] The invention relates to the technical fields of filter membrane, hydrogel, antibacterial and the like. Specifically relates to a preparation method of an alginate hydrogel antibacterial filter membrane containing zinc phosphate. Background technique [0003] Membrane separation technology is an environmentally friendly new technology. Compared with traditional wastewater treatment methods, it has no secondary pollution, low energy consumption, and simple operation. It is one of the most promising water treatment technologies at present. Traditional membranes are usually made of inorganic materials, organic polymer materials or inorganic-organic composite materials, and their structures are divided into various types; different materials and str...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/74B01D67/00C08L5/04C08K3/32C08J5/18
CPCB01D67/0079B01D71/74B01D2325/24B01D2325/48C08J5/18C08J2305/04C08K2003/328
Inventor 赵孔银程蒙蒙谢文宾李子逸李佳成杨文栋林泽赵慧高徽徽
Owner TIANJIN POLYTECHNIC UNIV