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Nano-silver/graphene/polyvinylidene fluoride hybrid ultrafiltration membrane and preparation method thereof

A technology of polyvinylidene fluoride and graphene, which is applied in the field of nanocomposite materials and ultrafiltration membranes, can solve the problems of increasing operating costs, shortening the service life of membranes, and irreversible attenuation, and achieves good antibacterial and anti-pollution properties.

Active Publication Date: 2016-01-06
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Membrane fouling will cause the attenuation of membrane flux, so it is necessary to use physical and chemical methods to clean the polluted membrane; in addition, some pollution will cause irreversible attenuation of membrane flux to a certain extent
Membrane fouling will greatly increase the operating cost and shorten the service life of the membrane

Method used

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  • Nano-silver/graphene/polyvinylidene fluoride hybrid ultrafiltration membrane and preparation method thereof
  • Nano-silver/graphene/polyvinylidene fluoride hybrid ultrafiltration membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] ① Disperse graphene oxide and polyethylene glycol ultrasonically (frequency 100Hz) in N,N-dimethylacetamide at 60°C, the ratio of graphene oxide mass to N,N-dimethylacetamide volume is 10g / L, the ratio of polyethylene glycol mass to N,N-dimethylacetamide volume is 12g / L. The oxygen content of the graphene oxide used is 14.6 wt%, and the molecular weight of the polyethylene glycol used is 800.

[0048] ② AgNO at 60℃ 3 , polyethylene glycol dissolved in N,N-dimethylacetamide, AgNO 3 The ratio of the mass to the volume of N,N-dimethylacetamide is 25g / L, and the ratio of the mass of polyethylene glycol to the volume of N,N-dimethylacetamide is 12g / L. The oxygen content of the graphene oxide used is 14.6 wt%, and the molecular weight of the polyethylene glycol used is 800.

[0049] ③ The solution prepared in step ① was mixed with the solution prepared in step ② in equal volumes, and treated with ultrasound (frequency 100 Hz) at 60° C. for 3 hours to prepare a nano-silver...

Embodiment 2

[0053] ① Disperse graphene oxide and polyethylene glycol ultrasonically (frequency 100Hz) in N,N-dimethylacetamide at 60°C. The ratio of graphene oxide mass to N,N-dimethylacetamide volume is 8g / L, the ratio of polyethylene glycol mass to N,N-dimethylacetamide volume is 15g / L. The oxygen content of the graphene oxide used is 16.3 wt%, and the molecular weight of the polyethylene glycol used is 2000.

[0054] ② AgNO at 60℃ 3 , polyethylene glycol dissolved in N,N-dimethylacetamide, AgNO 3 The ratio of mass to N,N-dimethylacetamide volume is 20g / L, and the ratio of polyethylene glycol mass to N,N-dimethylacetamide volume is 15g / L. The oxygen content of the graphene oxide used is 14.6 wt%, and the molecular weight of the polyethylene glycol used is 2000.

[0055] ③ The solution prepared in step ① was mixed with the solution prepared in step ② in equal volumes, and treated with ultrasound (frequency 100 Hz) at 60° C. for 3 hours to prepare a nano-silver / graphene composite solu...

Embodiment 3

[0059] ① Disperse graphene oxide and polyethylene glycol ultrasonically (frequency 100Hz) in N,N-dimethylacetamide at 60°C, the ratio of graphene oxide mass to N,N-dimethylacetamide volume is 6g / L, the ratio of polyethylene glycol mass to N,N-dimethylacetamide volume is 18g / L. The oxygen content of the graphene oxide used is 19.2 wt%, and the molecular weight of the polyethylene glycol used is 4000.

[0060] ② AgNO at 60℃ 3 , polyethylene glycol dissolved in N,N-dimethylacetamide, AgNO 3 The ratio of the mass to the volume of N,N-dimethylacetamide is 17g / L, and the ratio of the mass of polyethylene glycol to the volume of N,N-dimethylacetamide is 18g / L. The oxygen content of the graphene oxide used is 19.2 wt%, and the molecular weight of the polyethylene glycol used is 4000.

[0061] ③ The solution prepared in step ① was mixed with the solution prepared in step ② in equal volumes, and treated with ultrasound (frequency 100 Hz) at 60° C. for 3 hours to prepare a nano-silve...

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Abstract

The invention discloses a nano-silver / graphene / polyvinylidene fluoride hybrid ultrafiltration membrane and a preparation method thereof. The method comprises the steps of: (1) subjecting graphene oxide and polyethylene glycol to ultrasonic dispersion in N, N-dimethylacetamide to obtain a solution A; dissolving AgNO3 and polyethylene glycol in N, N-dimethylacetamide to obtain a solution B; (2) mixing the solution A and the solution B evenly in proportion to obtain a nano-silver / graphene compound solution; (3) dissolving polyvinylidene fluoride in the obtained nano-silver / graphene compound solution, and carrying out standing defoaming to obtain a membrane casting solution; and (4) preparing the membrane casting solution into the nano-silver / graphene / polyvinylidene fluoride hybrid ultrafiltration membrane by an immersion precipitation phase inversion process. With the preparation method, nano-silver particles can be uniformly loaded on graphene, also the nano-silver / graphene compound can be uniformly dispersed in the polyvinylidene fluoride hybrid ultrafiltration membrane, and the prepared hybrid ultrafiltration membrane has good antibacterial and anti-pollution performance.

Description

technical field [0001] The invention belongs to the technical field of nanocomposite materials and ultrafiltration membranes, and in particular relates to a preparation method of a nano silver / graphene / polyvinylidene fluoride hybrid ultrafiltration membrane with antibacterial and anti-pollution properties. Background technique [0002] Polyvinylidene fluoride is currently the most widely used ultrafiltration membrane material. Due to the hydrophobicity of the polyvinylidene fluoride membrane, pollutants are easily adsorbed and deposited on the surface of the membrane during use, blocking the pores of the membrane and causing membrane pollution, especially microbial pollution. Membrane fouling will cause the attenuation of membrane flux, so it is necessary to use physical and chemical methods to clean the polluted membrane; in addition, some pollution will cause irreversible attenuation of membrane flux to a certain extent. Membrane fouling will greatly increase the operatin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D69/02B01D71/34B01D67/00
Inventor 吴礼光张雪扬钟振宇庄仁哲陶立铭
Owner ZHEJIANG GONGSHANG UNIVERSITY
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