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Chitosan functionalized graphene oxide/polyvinylidene fluoride hybrid ultrafiltration membrane and preparation method thereof

A technology of polyvinylidene fluoride and chitosan, applied in chemical instruments and methods, ultrafiltration, membranes, etc., can solve problems such as uneven dispersion of graphene oxide and hydrophilic constraints of polyvinylidene fluoride ultrafiltration membranes, etc. Achieve the effects of performance improvement, simple preparation method, and improved dispersibility

Inactive Publication Date: 2016-08-31
NORTHWEST UNIV(CN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the π-π conjugation between graphene oxide sheets, graphene oxide is particularly easy to aggregate, resulting in severe uneven dispersion of graphene oxide in the polyvinylidene fluoride film matrix, mostly in an aggregated state, which makes graphite oxide Alkenes are severely constrained for improving the hydrophilicity of polyvinylidene fluoride ultrafiltration membranes

Method used

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  • Chitosan functionalized graphene oxide/polyvinylidene fluoride hybrid ultrafiltration membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) take 3g chitosan and be dissolved in 147g volume fraction and be made into the chitosan glacial acetic acid solution that mass fraction is 2% in the glacial acetic acid solution of 2%, then add 0.3g graphene oxide to deionized water, under room temperature Ultrasound for 1h to obtain a uniform graphene oxide dispersion;

[0027] Slowly add the graphene oxide dispersion into the chitosan glacial acetic acid solution dropwise while stirring, stir at room temperature for 24 hours, and wash several times with glacial acetic acid after the reaction to remove unreacted chitosan sugar, and then centrifuged and washed several times with deionized water, and vacuum-dried at 60° C. for 24 hours to prepare chitosan-graphene oxide, which is a nanocomposite.

[0028] 2) Prepare 30 g of casting solution: weigh 0.036 g of chitosan-graphene oxide, add 23.064 g of dimethylacetamide, and ultrasonicate for 1 hour at room temperature to obtain a uniform chitosan-graphene oxide dispersio...

Embodiment 2

[0039] 1) The preparation of the chitosan-graphene oxide nanocomposite is exactly the same as in Example 1.

[0040] 2) The difference with embodiment 1 is that the amount of chitosan-graphene oxide added in the casting solution is different. The specific operation is as follows: prepare 30 g of casting solution, weigh 0.018 g of chitosan-graphene oxide, add 23.082 g of dimethylacetamide, and ultrasonicate for 1 hour at room temperature to obtain a uniform chitosan-graphene oxide dispersion;

[0041] Sequentially weigh 6g of polyvinylidene fluoride (110°C vacuum drying for 12h), add 0.9g of polyvinylpyrrolidone (molecular weight 58000g / mol) into the above chitosan-graphene oxide dispersion, stir at 60°C for 24h, and then Stand at a constant temperature at 60°C for 12 hours for defoaming, scrape evenly on the polyester non-woven fabric with a scraper to form a casting layer, the thickness of the casting layer is 150±10μm, and then immediately put it into deionized water at 25°C...

Embodiment 3

[0044] 1) Preparation of chitosan-graphene oxide:

[0045] Dissolving chitosan in a 1% glacial acetic acid solution by volume fraction is prepared into a 3% chitosan glacial acetic acid solution by mass fraction;

[0046] Add graphene oxide into deionized water, and ultrasonicate at room temperature for 1 hour to obtain a graphene oxide dispersion; add the graphene oxide dispersion to chitosan glacial acetic acid solution under stirring, stir at room temperature for 24 hours, and then centrifugally wash with glacial acetic acid Several times, remove unreacted chitosan, then centrifuge and wash several times with deionized water, and vacuum dry to obtain chitosan-graphene oxide; wherein, the mass ratio of graphene oxide to chitosan is 1 : 10; Gained chitosan-graphene oxide is a lamellar structure with a thickness of 2-3nm.

[0047] 2) chitosan-graphene oxide is added in the organic solvent, after ultrasonic 1h at room temperature, obtain chitosan-graphene oxide dispersion liqu...

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Abstract

The invention provides a chitosan functionalized graphene oxide / polyvinylidene fluoride hybrid ultrafiltration membrane and a preparation method thereof. Firstly, chitosan is used for covalent functionalization of graphene oxide to prepare chitosan-graphene oxide; the chitosan-graphene oxide is dispersed in an organic solvent in an ultrasonic mode, then polyvinylidene fluoride and a pore-foaming agent are added and stirred at certain temperature to be evenly dissolved to obtain a membrane casting solution, water serves as a coagulating bath, and the chitosan-graphene oxide / polyvinylidene fluoride hybrid ultrafiltration membrane is prepared through the immerged phase-inversion process. The chitosan-graphene oxide / polyvinylidene fluoride hybrid ultrafiltration membrane prepared through the method improves dispersibility of graphene oxide in a membrane matrix, and compared with a graphene oxide / polyvinylidene fluoride ultrafiltration membrane, hydrophilicity, water flux, antifouling property and other aspects are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of ultrafiltration membrane separation, and in particular relates to a chitosan functionalized graphene oxide / polyvinylidene fluoride hybrid ultrafiltration membrane and a preparation method thereof. Background technique [0002] Polyvinylidene fluoride is widely used in the preparation of ultrafiltration membranes because of its good film-forming properties, such as good mechanical properties, high temperature resistance, and chemical resistance. However, since polyvinylidene fluoride itself is a hydrophobic polymer, the prepared polyvinylidene fluoride ultrafiltration membrane has poor hydrophilicity, resulting in low water flux, and pollutants are easily adsorbed and deposited on the membrane surface or membrane during the filtration process. Pores, the separation performance of the membrane is greatly reduced, which seriously restricts the application of ultrafiltration membranes in industry. [0003] I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/02B01D67/00B01D61/14
CPCB01D71/34B01D61/145B01D67/0013B01D69/02B01D71/021B01D71/74B01D2325/28
Inventor 韩小龙王森王玉琪
Owner NORTHWEST UNIV(CN)
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