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Preparation method of temperature and PH double-sensitive ultrafiltration membrane

An ultrafiltration membrane, a sensitive technology, applied in the field of membrane separation, can solve the problems of hydrophilic loss, reduced service life of membrane products, and reduced anti-pollution ability, so as to achieve not easy loss, good compatibility, and reduced hydrophilic loss Effect

Inactive Publication Date: 2018-08-17
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the introduction of graphene oxide can increase the permeation flux of the polymer separation membrane, and its strength and anti-pollution ability have been greatly improved, but its hydrophilicity is seriously lost during use and cleaning, especially when cleaning with drugs. Gradually reduce its anti-pollution ability and reduce the service life of membrane products

Method used

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  • Preparation method of temperature and PH double-sensitive ultrafiltration membrane
  • Preparation method of temperature and PH double-sensitive ultrafiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) Add 0.125g of graphene oxide and 250ml of deionized water into a 500ml three-necked flask, stir and sonicate for 60 minutes, add 1.0g of sodium borohydride to the mixture, and put it in an oil bath at 80°C for 24 hours to obtain a black solution; add 6g of Add isopropylacrylamide, 0.6g acrylic acid, 0.1g methylene bisacrylamide and 50ml deionized water into the flask, stir for 30 minutes, then purify with dry nitrogen for 30 minutes to remove oxygen, and then add 100ml mass through the dropping funnel The ammonium persulfate aqueous solution with a fraction of 1% was placed in a constant temperature oil bath at 65°C and stirred. After 48 hours, the mixture was cooled to room temperature, diluted with 200ml of deionized water, ultrasonicated for 1 hour, and the black product was collected by centrifugation at 40°C. Drying and vacuum drying for 24 hours to obtain the product;

[0023] 2) Mix 5g of the product in 1) with a molecular weight of 50,000, 140g of polypropyle...

Embodiment 2

[0027] 1) Add 0.1g of graphene oxide and 200ml of deionized water into a 500ml three-necked flask, stir and sonicate for 40 minutes, add 0.8g of sodium borohydride to the mixture, and put it in an oil bath at 75°C for 24 hours to obtain a black solution; add 2g of iso Propylacrylamide, 10g of acrylic acid, 0.4g of methylenebisacrylamide and 50ml of deionized water were added to the flask, stirred for 30 minutes, and then purged with dry nitrogen for 30 minutes to remove oxygen, and then 100ml of mass fraction was added through the dropping funnel. 1% ammonium persulfate aqueous solution, placed in a constant temperature oil bath at 70°C and stirred, after 48 hours, the mixture was cooled to room temperature, diluted with 200ml deionized water, ultrasonicated for 1 hour, centrifuged to collect the black product, dried at 50°C under vacuum The product was obtained after drying for 24 hours;

[0028] 2) Mix 1g of the product in 1) with a molecular weight of 100,000, 100g of polys...

Embodiment 3

[0032] 1) Add 0.2g of graphene oxide and 400ml of deionized water into a 1000ml three-neck flask, stir and sonicate for 80 minutes, add 1.6g of sodium borohydride to the mixture, and put it in an oil bath at 85°C for 24 hours to obtain a black solution; 4g of isopropyl Acrylamide, 4g of acrylic acid, 0.3g of methylenebisacrylamide and 50ml of deionized water were added to the flask, stirred for 30 minutes, then purged with dry nitrogen for 30 minutes to remove oxygen, and then 100ml of % ammonium persulfate aqueous solution, placed in a constant temperature oil bath at 75°C and stirred, after 48 hours, the mixture was cooled to room temperature, diluted with 200ml of deionized water, ultrasonicated for 1 hour, centrifuged to collect the black product, dried in vacuum at 45°C The product is obtained within 24 hours;

[0033] 2) Mix 5g of the product in 1) with a molecular weight of 4000, 140g of polyvinyl chloride, 715g of dimethylformamide, and 13g of isopropanol, stir and hea...

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Abstract

The invention belongs to the technical field of membrane separation, and particularly relates to a preparation method of a temperature and PH double-sensitive ultrafiltration membrane. The preparationmethod includes: polymerizing N-isopropyl acrylamide, acrylic acid and graphene oxide together, guiding into the ultrafiltration membrane. The ultrafiltration membrane prepared by the method has environmental response around 30 DEG C and when PH is equal to 4 and can be in intramolecular motion to remove part of pollutants, the surface of the membrane can be cleaned by adjusting water temperatureor pH value, agent-adding cleaning efficiency of the ultrafiltration membrane can be greatly lowered, and hydrophilic loss of graphene oxide is further lowered, so that the ultrafiltration membrane is more lasting in pollution resistance, can lower the hydrophilic loss of graphene oxide and has good application prospect.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, in particular to a method for preparing a temperature- and pH-sensitive ultrafiltration membrane. Background technique [0002] Due to the deterioration of water resources, membrane technology has attracted more and more attention. The main membrane technologies used in water treatment include microfiltration, ultrafiltration, nanofiltration, reverse osmosis and the recent popular forward osmosis technology. Most of the ultrafiltration membranes are made of polymers, and they are mainly used in practical projects in the form of hollow fiber membranes and composite membranes. This kind of membrane with pressure as the driving force still has many defects in practical applications, such as low membrane strength, poor anti-pollution ability, and insufficient life span. [0003] Graphene oxide (GO) is a honeycomb two-dimensional planar film composed of a single layer of carbon atoms, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D71/30B01D71/26B01D69/08B01D69/02B01D69/06B01D67/00
CPCB01D67/0079B01D69/02B01D69/06B01D69/08B01D71/26B01D71/30B01D71/68B01D2325/22B01D2325/30
Inventor 侯琳熙高娇罗鹏张洁
Owner FUZHOU UNIV
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