Method for preparing epichlorohydrin crosslinked chitosan/aminated carbon nanotube composite aerogel

A composite technology of cross-linked chitosan and nanotubes, which is applied to chemical instruments and methods, alkali metal oxides/hydroxides, alkali metal compounds, etc. Use performance and other issues to achieve the effect of avoiding agglomeration, improving use performance and separation performance, and improving dispersion

Active Publication Date: 2018-11-06
EAST CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the original carbon nanotubes, the aminated carbon nanotubes have a higher adsorption capacity for uranium, but the dispersibility of the aminated carbon nanotubes is poor, and it is difficult to separate them from the water when they are used for the treatment of uranium-containing wastewater in water bodies. ultimately affect its performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A carbon fiber reinforced sodium tripolyphosphate cross-linked chitosan / aminated carbon nanotube composite filter membrane preparation method, the specific steps are as follows:

[0034] (1) Preparation of aminated carbon nanotubes

[0035] 1.0 g of carbon nanotubes was added to 50 mL of 70 wt.% concentrated nitric acid solution, heated at 150 °C for 12 h by microwave reflux, and the obtained solid phase product was centrifuged, then added to 50 mL of triethylenetetramine solution (10 wt. .%), and 1.0 g cyclohexylcarbodiimide (condensing agent) was added, and the mixture was heated under microwave reflux for 12 h at 110 °C to obtain aminated carbon nanotubes.

[0036] (2) Preparation of cross-linked chitosan / aminated carbon nanotube composite hydrogel:

[0037] 1) Add 2 g of chitosan to 80 mL of acetic acid solution (2 wt.%), and stir at 40 °C until completely dissolved to obtain a chitosan solution;

[0038] 2) Add 0.1 g of aminated carbon nanotubes (aminated carbon ...

Embodiment 2

[0045]A carbon fiber reinforced sodium tripolyphosphate cross-linked chitosan / aminated carbon nanotube composite filter membrane preparation method, the specific steps are as follows:

[0046] (1) Preparation of aminated carbon nanotubes

[0047] Same as step (1) of embodiment 1.

[0048] (2) Preparation of cross-linked chitosan / aminated carbon nanotube composite hydrogel:

[0049] 1) Add 2 g of chitosan to 80 mL of acetic acid solution (2 wt.%), and stir at 40 °C until completely dissolved to obtain a chitosan solution;

[0050] 2) According to a certain ratio (aminated carbon nanotubes / chitosan mass ratio 10%), add 0.2 g of aminated carbon nanotubes (aminated carbon nanotubes) to the above chitosan solution, and stir thoroughly for 2 h to mix;

[0051] 3) Add 2mL of epichlorohydrin solution (10wt.%) to the above mixture, raise the temperature to 50°C, stir and cross-link at 50°C for 1 hour, then stop stirring.

[0052] 4) Pour the cross-linked mixture into glass watch gla...

Embodiment 3

[0057] A carbon fiber reinforced sodium tripolyphosphate cross-linked chitosan / aminated carbon nanotube composite filter membrane preparation method, the specific steps are as follows:

[0058] (1) Preparation of aminated carbon nanotubes

[0059] Same as step (1) of embodiment 1.

[0060] (2) Preparation of cross-linked chitosan / aminated carbon nanotube composite hydrogel:

[0061] 1) Add 2 g of chitosan to 80 mL of acetic acid solution (2 wt.%), and stir at 40 °C until completely dissolved to obtain a chitosan solution;

[0062] 2) Add 0.3 g of aminated carbon nanotubes (aminated carbon nanotubes) to the above chitosan solution according to a certain ratio (aminated carbon nanotubes / chitosan mass ratio 15%), and stir thoroughly for 2 h to mix;

[0063] 3) Add 2mL of epichlorohydrin solution (10wt.%) to the above mixture, raise the temperature to 50°C, stir and cross-link at 50°C for 1 hour, then stop stirring.

[0064] 4) Pour the cross-linked mixture into glass watch gla...

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Abstract

The invention relates to a method for preparing epichlorohydrin crosslinked chitosan / aminated carbon nanotube composite aerogel and specifically relates to a method for preparing composite aerogel bya freeze-drying method using chitosan and aminated carbon nanotubes as substrates and epichlorohydrin cross-linking and belongs to the field of functional materials. The aminated carbon nanotube can be used as a skeleton supporting material of the chitosan-based aerogel, effectively improves the mechanical strength of the chitosan-based composite aerogel and is easy to mold. The epichlorohydrin crosslinked chitosan / aminated carbon nanotube composite aerogel is lump and is easy to use and separate from water. The composite aerogel has a highly developed three-dimensional porous structure, goodmechanical strength and chemical stability, a U(VI) adsorption rate and adsorption capacity higher than those of the common resin and the highest adsorption capacity of 310 mg / g, realizes adsorption balance in 10min and is used for rapid and efficient separation and enrichment of uranium in uranium-containing wastewater.

Description

technical field [0001] The invention relates to a preparation method of epichlorohydrin cross-linked chitosan / aminated carbon nanotube composite airgel. Specifically, it relates to a method for preparing composite airgel by freeze-drying method using chitosan and aminated carbon nanotubes as substrates, crosslinking with epichlorohydrin, and belongs to the field of functional materials. Background technique [0002] The radioactive pollution caused by uranium mining, uranium processing and production, and uranium-containing waste water from uranium tailings seriously endangers the surrounding environment and human health. Utilizing high-efficiency separation materials to extract uranium from uranium-containing wastewater can effectively reduce environmental pollution and effectively recover uranium resources in wastewater. Chitosan molecules are rich in amino groups and hydroxyl groups, which can effectively complex uranyl ions in wastewater, so it can effectively adsorb ur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/20B01J20/28B01J20/30C02F1/28
CPCB01J20/205B01J20/24B01J20/28047B01J20/3085C02F1/283C02F1/286C02F2101/006
Inventor 周利民
Owner EAST CHINA UNIV OF TECH
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