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A kind of 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 problems such as increased operating costs, irreversible attenuation, and membrane flux attenuation, and achieves good antibacterial and anti-pollution properties.

Active Publication Date: 2017-11-07
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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  • A kind of nano-silver/graphene/polyvinylidene fluoride hybrid ultrafiltration membrane and preparation method thereof
  • A kind of 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, comprising the following steps: (1) ultrasonically dispersing graphene oxide and polyethylene glycol in N, N-dioxide In methylacetamide, solution A is obtained; AgNO3 and polyethylene glycol are dissolved in N,N-dimethylacetamide to obtain solution B; (2) the obtained solution A and solution B are mixed in proportion to obtain nano silver / graphene composite solution; (3) polyvinylidene fluoride is dissolved in the obtained nano-silver / graphene composite solution, and the cast film solution is obtained after degassing; (4) the gained cast film solution is immersed in the precipitated phase Nano-silver / graphene / polyvinylidene fluoride hybrid ultrafiltration membrane prepared by conversion method. The preparation method of the present invention can make nano-silver particles more uniformly loaded on graphene, and the nano-silver / graphene composite can be uniformly dispersed in the polyvinylidene fluoride hybrid ultrafiltration membrane, and the prepared hybrid ultrafiltration membrane The membrane has good antibacterial and antifouling properties.

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 Patents(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