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Method for preparing porous chitosan membrane from graphene oxide (GO)-stabilized Pickering emulsion

The technology of porous chitosan and oxide stone is applied in the field of preparation of porous chitosan film, which can solve the problems such as limiting the scope of use, and achieve the effects of low cost of raw materials, uniform porous structure and mild preparation conditions.

Active Publication Date: 2018-04-10
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still many disadvantages to prepare porous membranes from bio-based polymers: (1) Compared with petroleum-based polymers, most bio-based polymers are water-soluble; It is necessary to be able to maintain structural stability in water
(2) The temperature change during the preparation process will cause a strong change in its conformation (such as physical gelatinization, starch gelatinization and aging), which limits its application range
[0006] Therefore, in summary, there is still a lack of an efficient and economical method for preparing porous chitosan membranes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add an appropriate amount of GO to deionized water to obtain a concentration of 1 g.L -1 GO suspension dispersion liquid, and emulsifying machine dispersion treatment 10min; The chitosan solution of 10%W / V is joined in the GO suspension liquid and dissolves at 30 ℃, adds ethyl benzoate as oil phase, oil-water volume ratio (O / W) is 0.25, dispersed by an emulsifier for 5 minutes, placed in a water bath at 40°C for 0.5h, then cast to form a film, and then placed at 40°C for 2 days to obtain an uncrosslinked film.

[0022] Immerse the uncrosslinked membrane in a 1wt% glyoxal solution with ethanol as a solvent, and keep crosslinking in the glyoxal solution for 3 hours at 40°C; the crosslinked membrane is washed with ethanol and deionized water until the upper layer The supernatant was clear and transparent; then the film was dried again to obtain a chitosan film with a porous structure.

Embodiment 2

[0024] Add an appropriate amount of GO to deionized water to obtain a concentration of 3 g.L -1 GO suspension dispersion liquid, and emulsifying machine dispersion treatment 30min; The chitosan solution of 20%W / V is joined in the GO suspension liquid and dissolves at 40 ℃, adds propyl benzoate as oil phase, oil-water volume ratio (O / W) is 0.5, dispersed by an emulsifier for 10 minutes, placed in a water bath at 50°C for 1 hour, then poured to form a film, and then placed at 50°C for 3 days to obtain an uncrosslinked film.

[0025] Immerse the uncrosslinked membrane in a 2.5wt% malondialdehyde solution with ethanol as a solvent, and keep crosslinking in the malondialdehyde solution at 50°C for 5h; the crosslinked membrane is washed with ethanol and deionized water until The supernatant was clear and transparent; then the film was dried again to obtain a chitosan film with a porous structure.

Embodiment 3

[0027] Add an appropriate amount of GO to deionized water to obtain a concentration of 6 g.L -1 GO suspension dispersion liquid, and emulsifying machine dispersion treatment 60min; The chitosan solution of 30%W / V is joined in the GO suspension liquid and dissolves at 50 ℃, adds butyl benzoate as oil phase, oil-water volume ratio (O / W) is 0.75, dispersed by an emulsifier for 15 minutes, placed in a water bath at 60°C for 1.5h, then cast to form a film, and then placed at 60°C for 4 days to obtain an uncrosslinked film.

[0028] Immerse the uncrosslinked membrane in a 4wt% glutaraldehyde solution with ethanol as a solvent, and keep it in the glutaraldehyde solution for 7 hours at 60°C to crosslink; the crosslinked membrane is washed with ethanol and deionized water until the upper layer The supernatant was clear and transparent; then the film was dried again to obtain a chitosan film with a porous structure.

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Abstract

The invention discloses a method for preparing a porous chitosan membrane from a GO-stabilized Pickering emulsion. The method comprises the following steps: adding a proper amount of GO into deionizedwater so as to prepare a GO suspension dispersion solution and carrying out ultrasonic treatment; dissolving a chitosan solution into the GO suspension dispersion solution, adding benzoic acid esteras an oil phase and then carrying out ultrasonic treatment; placing a sample in a water bath and then carrying out casting to obtain an uncross-linked membrane; impregnating the uncross-linked membrane in a solution containing a cross-linking agent for cross-linking of the membrane for a period of time, then carrying out washing with ethanol and deionized water; and finally drying the membrane soas to obtain the chitosan membrane with a porous structure. The preparation method provided by the invention is simple in preparation process, friendly to environment and low in requirements on equipment; high stability of aqueous solutions is realized; the porous structure is uniform; large-scale production of the membrane can be easily implemented; and the porous chitosan membrane has good application prospects in the fields of food preservation, wastewater treatment, catalysis, heavy metal ion detection and the like.

Description

【Technical field】 [0001] The invention relates to the field of preparation of porous chitosan membranes, in particular to a method for preparing porous chitosan membranes from graphene oxide (GO) stabilized Pickering emulsions. 【Background technique】 [0002] Polymer membranes play a vital role in the water separation and filtration industry. However, its preparation process uses a large amount of toxic organic solvents, and the post-treatment of organic solvents is very expensive. Due to the renewable nature of bio-based polymers, bio-based polymers can be used to replace petroleum-based polymers. However, there are still many disadvantages to prepare porous membranes from bio-based polymers: (1) Compared with petroleum-based polymers, most bio-based polymers are water-soluble; Being able to maintain structural stability in water is essential. (2) The temperature change during the preparation process will cause a strong change in its conformation (such as physical gelati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08J7/12C08L5/08C08K3/04
CPCC08J5/18C08J7/12C08J2305/08C08K3/04
Inventor 罗静陈亚鑫樊效宗吴凯云朱叶刘晓亚
Owner JIANGNAN UNIV
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