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Cellulose acetate composite dialysis membrane and preparation method thereof

A cellulose acetate and dialysis membrane technology, applied in the field of membrane materials, can solve the problems of slow diffusion rate of solvent and coagulation bath, difficult water flux to meet practical application, thick dialysis membrane skin, etc., and achieve good hydrophilicity and stability. Anti-pollution ability, improve hydrophilicity and water flux, improve the effect of hydrophilic

Inactive Publication Date: 2020-02-04
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, due to the good hydrophilicity of cellulose acetate in the phase inversion process, the diffusion rate between the solvent and the coagulation bath slows down, so that the prepared dialysis membrane has a thick skin, narrow pore size, and low porosity, so the water flux Difficult to meet the needs of practical applications

Method used

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  • Cellulose acetate composite dialysis membrane and preparation method thereof
  • Cellulose acetate composite dialysis membrane and preparation method thereof
  • Cellulose acetate composite dialysis membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The present embodiment provides a kind of preparation method of cellulose acetate composite dialysis membrane, comprising:

[0044] (1) Prepare materials according to the following ratio

[0045] Co(NO 3 ) 2 ·6H 2 O 1.50g, 2-methylimidazole 1.65g, GO 0.75g, methanol 200mL; ZIF-67@GO 0.10g, cellulose acetate 15g, polyethylene glycol 400 12g, N,N-dimethylformamide 72.90mL .

[0046] (2) Preparation method of ZIF-67@GO:

[0047] Take Co(NO 3 ) 2 ·6H 2 O) and 2-methylimidazole as raw materials, Co(NO 3 ) 2 ·6H 2 The solids of O (1.50g) and 2-methylimidazole (1.65g) were dissolved in 40mL of methanol and 160mL of methanol respectively, and stirred until the solids were completely dissolved, then the cobalt nitrate solution was quickly dropped into the 2-methylimidazole solution. At the same time, a certain mass of GO (0.75 g) was added into the mixed solution, and the solution was sonicated for 3 h (temperature 30 °C, ultrasonic power 80 Hz).

[0048] After the r...

Embodiment 2

[0058] The present embodiment provides a kind of preparation method of cellulose acetate composite dialysis membrane, comprising:

[0059] (1) Prepare materials according to the following ratio

[0060] Co(NO 3 ) 2 ·6H 2 O 1.50g, 2-methylimidazole 1.65g, GO 0.75g, methanol 200mL; ZIF-67@GO 0.20g, cellulose acetate 15g, polyethylene glycol 400 12g, N,N-dimethylformamide 72.80mL .

[0061] (2) Preparation method of ZIF-67@GO:

[0062] With (Co(NO 3 ) 2 ·6H 2 O) and 2-methylimidazole as raw materials, Co(NO 3 ) 2 ·6H 2 The solids of O (1.50g) and 2-methylimidazole (1.65g) were dissolved in 40mL of methanol and 160mL of methanol respectively, and stirred until the solids were completely dissolved, then the cobalt nitrate solution was quickly dropped into the 2-methylimidazole solution. At the same time, a certain mass of GO (0.75 g) was added into the mixed solution, and the solution was sonicated for 3 h (temperature 30 °C, ultrasonic power 80 Hz).

[0063] After the ...

Embodiment 3

[0071] The present embodiment provides a kind of preparation method of cellulose acetate composite dialysis membrane, comprising:

[0072] (1) Prepare materials according to the following ratio

[0073] Co(NO 3 ) 2 ·6H 2 O 1.50g, 2-methylimidazole 1.65g, GO 0.75g, methanol 200mL; ZIF-67@GO 0.30g, cellulose acetate 15g, polyethylene glycol 400 12g, N,N-dimethylformamide 72.70mL .

[0074] (2) Preparation method of ZIF-67@GO:

[0075] With (Co(NO 3 ) 2 ·6H 2 O) and 2-methylimidazole as raw materials, Co(NO 3 ) 2 ·6H 2 The solids of O (1.50g) and 2-methylimidazole (1.65g) were dissolved in 40mL of methanol and 160mL of methanol respectively, and stirred until the solids were completely dissolved, then the cobalt nitrate solution was quickly dropped into the 2-methylimidazole solution. At the same time, a certain mass of GO (0.75 g) was added into the mixed solution, and the solution was sonicated for 3 h (temperature 30 °C, ultrasonic power 80 Hz).

[0076] After the ...

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Abstract

The invention belongs to the technical field of membrane materials, and particularly relates to a cellulose acetate composite dialysis membrane and a preparation method thereof. The preparation methodof the cellulose acetate composite dialysis membrane is characterized in that the cellulose acetate composite dialysis membrane is prepared by modifying cellulose acetate, used as a raw material, with ZIF-67-GO as a modifier through adopting an immersion precipitation phase inversion technology. ZIF-67@GO is prepared by adopting an ultrasonic solvothermal technology, and GO is subjected to blending modification by utilizing the characteristics of porous structure and large specific surface area of ZIF-67 in order to improve the problem that the GO is prone to agglomerating and increase the working area of the graphene oxide, so the hydrophilicity and the water flux of the cellulose acetate dialysis membrane and enhance the strength of the composite membrane, the anti-pollution capabilityof the obtained composite dialysis membrane is also improved. The method adopting blending modification can give full play to the performance advantages of GO, and has the advantages of simplicity inmodification operation, and low cost; and the obtained modified composite dialysis membrane has the advantages of good hydrophilicity, good anti-pollution capacity, large flux, high mechanical strength and effectively prolonged service life.

Description

technical field [0001] The invention belongs to the technical field of membrane materials, and in particular relates to a cellulose acetate composite dialysis membrane and a preparation method thereof. Background technique [0002] Cellulose acetate is a thermoplastic resin obtained by catalytic esterification of cellulose and acid anhydride. It is the most commonly used film-making raw material in the market today. It has the advantages of low price, chemical stability, high mechanical strength, and good thermal stability. The film-making process is simple and the material sources are extensive and easy to obtain. [0003] However, due to the good hydrophilicity of cellulose acetate in the phase inversion process, the diffusion rate between the solvent and the coagulation bath slows down, so that the prepared dialysis membrane has a thick skin, narrow pore size, and low porosity, so the water flux It is difficult to meet the needs of practical applications. Therefore, how...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/16B01D69/12B01D67/00
CPCB01D67/0079B01D69/12B01D71/16B01D2325/24B01D2325/36
Inventor 张力平杨淑娟王天浩
Owner BEIJING FORESTRY UNIVERSITY
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