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A preparation method of rare earth ion doped calcium alginate/carbon nanotube hydrogel antibacterial filter membrane

A technology of calcium alginate and rare earth ions, applied in the fields of rare earth, filter membrane, hydrogel, antibacterial, functional material and membrane separation, can solve the problem of low strength of calcium alginate hydrogel filter membrane, poor hydrophilicity of filter membrane, It is easy to be degraded by bacteria and other problems, and achieves the effects of good anti-pollution performance, green preparation process and simple preparation method.

Active Publication Date: 2021-12-31
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the deficiencies of the prior art, the technical problem to be solved by the present invention is that the traditional filter membrane has poor hydrophilicity, is not resistant to pollution, has low strength of the calcium alginate hydrogel filter membrane, and is easily degraded by bacteria.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] a) Prepare an aqueous solution of a mixture of carboxylated single-walled carbon nanotubes with a mass percent concentration of 0.01%, then add sodium alginate solid powder with a mass percent concentration of 0.2% to the aqueous solution of the mixture, stir while adding, and ultrasonically disperse to obtain carboxylation The aqueous solution of the mixture of single-walled carbon nanotubes and sodium alginate is left to defoam to obtain the casting solution;

[0021] b) preparing an aqueous solution of calcium chloride with a mass percent concentration of 0.2% as a coagulation bath;

[0022] 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 coagulation bath for 5 minutes, while calcium chloride reacts with sodium alginate to form calcium alginate hydro...

Embodiment 2

[0025] a) Prepare an aqueous solution of a mixture of carboxylated double-walled carbon nanotubes with a concentration of 5% by mass, then add sodium alginate solid powder with a concentration of 8% by mass to the aqueous solution of the mixture, stir while adding, and ultrasonically disperse to obtain carboxylation The aqueous solution of the mixture of double-walled carbon nanotubes and sodium alginate is left to defoam to obtain the casting solution;

[0026] b) preparing an aqueous solution of calcium nitrate with a mass percent concentration of 20% as a coagulation bath;

[0027] 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) The obtained coagulation bath was soaked for 240min, and the calcium nitrate and sodium alginate reacted to form calcium alginate hydrogel, and at the...

Embodiment 3

[0030] a) Prepare an aqueous solution of a mixture of carboxylated multi-walled carbon nanotubes with a concentration of 1% by mass, then add sodium alginate solid powder with a concentration of 2% by mass to the aqueous solution of the mixture, stir while adding, and ultrasonically disperse to obtain carboxylation The aqueous solution of the mixture of multi-walled carbon nanotubes and sodium alginate is left to defoam to obtain the casting solution;

[0031] b) preparing an aqueous solution of calcium dihydrogen phosphate with a mass percentage concentration of 10% as a coagulation bath;

[0032] c) Pour the film casting solution obtained in step a) onto a dry and clean glass plate, scrape it flat with a glass rod with a diameter of 500 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 coagulation bath for 60 minutes, calcium dihydrogen phosphate reacts with sodium alginate to form calcium algin...

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Abstract

The invention discloses a preparation method of a rare earth ion-doped calcium alginate / carbon nanotube hydrogel antibacterial filter membrane. First, carboxylated carbon nanotubes and sodium alginate are dissolved in water to obtain a casting solution, and the casting solution is scraped into a film and soaked in a soluble calcium salt solution to fully cross-link to obtain a carboxylated carbon nanotube-containing Calcium alginate hydrogel film. Calcium ions can simultaneously cross-link the carboxyl groups on the carboxylated carbon nanotubes and the carboxyl groups on the alginate to generate an organic-inorganic hybrid material, thereby improving the strength of the calcium alginate hydrogel and reducing its swelling performance. Carboxylated carbon nanotubes impart certain antibacterial properties to calcium alginate hydrogels. In order to further improve the antibacterial properties and mechanical strength of the hydrogel, the calcium alginate hydrogel filter membrane containing carboxylated carbon nanotubes was soaked in the solution of rare earth ions for secondary cross-linking to obtain a rare earth ion doped seaweed Calcium Oxide / Carbon Nanotube Hydrogel Antibacterial Filtration Membrane.

Description

technical field [0001] The invention relates to a preparation method of a rare earth ion-doped calcium alginate / carbon nanotube hydrogel antibacterial filter membrane, which belongs to the field of functional materials and membrane separation. [0002] The invention relates to the technical fields of rare earth, antibacterial, filter membrane, hydrogel and the like. Specifically relates to a preparation method of rare earth ion doped calcium alginate / carbon nanotube hydrogel antibacterial filter membrane. Background technique [0003] Commonly used membrane filtration materials such as polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polyvinylidene fluoride (PVDF), poly (PSF), etc., have low surface energy and strong hydrophobicity. It is very easy to cause organic matter (protein, etc.) to adsorb on the surface of the membrane and in the pores of the membrane, resulting in membrane fouling and serious attenuation of the filtration flux. In view of this cha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/74B01D69/00B01D69/02B01D67/00
CPCB01D71/74B01D71/021B01D69/00B01D69/02B01D67/0079B01D2325/48B01D2325/24B01D2323/30
Inventor 赵孔银白甜苗君萍谢文宾郭智龙张越谢慧珂唐李文胡云霞
Owner TIANJIN POLYTECHNIC UNIV