Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Forward osmosis membrane and preparation method thereof

A forward osmosis membrane and membrane structure technology, applied in the field of polymer separation membrane preparation, can solve the problems of insufficient antibacterial efficiency, weak antibacterial effect, and affecting membrane performance, so as to improve forward osmosis, comprehensive antibacterial effect, and inhibit breeding Effect

Active Publication Date: 2021-10-12
BEIJING BAOSHENGTONG INT ELECTRIC ENG TECH CO LTD
View PDF9 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the two patent technologies all mention that the disclosed technical solutions have antibacterial effects, the two technical solutions all provide a modified forward osmosis membrane by adding graphene material or chitin nanocrystals to the active layer of the forward osmosis membrane. The cellulose triacetate film layer mainly solves performance problems such as increasing water flow and reducing internal concentration polarization, but the antibacterial effect is not strong
[0007] In recent years, with the understanding of forward osmosis technology, forward osmosis membranes can adapt to more complex water quality, but in existing technologies and products, such as the forward osmosis membranes disclosed in the above-mentioned patent applications and patented technologies, because of their antibacterial Insufficient efficiency can not meet the long-term effective use of forward osmosis membrane in complex and nutrient-rich water quality. In the long-term use process, eutrophic raw water is still easy to cause a large number of bacteria to breed and reproduce on the raw water side, thus fouling the membrane. Membrane performance

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Forward osmosis membrane and preparation method thereof
  • Forward osmosis membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0046] The preparation method scheme of the forward osmosis membrane provided by the invention is further described as follows:

[0047] Preparation of nano-Ag / TiO2 modified polyester mesh: add nano-Ag at 0.1-0.5 wt.% by mass percentage and nano-TiO2 at 0.2-1wt.% by mass percentage to polyethylene with a mass percentage of 2-8 wt.% In the alcohol aqueous solution, the suspension was obtained by ultrasonic dispersion, and the polyester mesh was impregnated with the suspension, and then dried naturally for later use;

[0048] Preparation of casting solution: Add 8-15wt.% of cellulose triacetate to 5-20 wt.% of acetone, 5-10 wt.% of methanol and 6-8% of lactic acid wt.%, and the rest is 1,4-dioxane, after stirring at 40°C for 24 hours, a uniform casting solution is obtained; the obtained casting solution is left to stand for 24 hours to fully defoam or assist Ultrasonic defoaming;

[0049] Pour the completely defoamed casting solution on a glass plate covered with a prepared mo...

Embodiment 1

[0054] 1. Soak the polyester screen with a thickness of 30 μm and a pore size of 100 mesh with 2% hydrochloric acid and 10% sodium hydroxide for 1 hour to remove impurities adsorbed on the surface, then rinse with deionized water, and dry for later use;

[0055] 2. Prepare nano-Ag, nano-TiO Modified polyester mesh: 0.2wt.% by mass percentage of nano-Ag, nano-TiO2 by mass percentage 0.4wt.%, join in the polyvinyl alcohol aqueous solution of mass percentage 4wt.%, Ultrasonic dispersion is used to obtain a suspension, which is impregnated with a polyester mesh and dried naturally for later use;

[0056] 3. Add cellulose triacetate at a mass percentage of 13 wt.% to 1,4-dioxane with a mass percentage of 54 wt.%, acetone with a mass percentage of 19 wt.%, methanol with a mass percentage of 8 wt.% and lactic acid In the mixed solution with a mass percentage of 6%, after stirring at a temperature of 40°C for 24 hours, a uniform casting solution was obtained;

[0057] 4. Leave the ca...

Embodiment 2

[0064] 1. Soak the polyester mesh with a thickness of 50 µm and a pore size of 100 mesh with 2% hydrochloric acid and 10% sodium hydroxide for 1 hour to remove impurities adsorbed on the surface, then rinse with deionized water, and dry for later use;

[0065] 2. Preparation of nano-Ag, nano-TiO2 modified polyester mesh: 0.2wt.% of nano-Ag by mass percentage, 0.4wt.% of nano-TiO2 by mass percentage, join in the polyvinyl alcohol aqueous solution of 4wt.% by mass percentage , through ultrasonic dispersion, to prepare a suspension, after impregnating the suspension with a polyester mesh, and drying it naturally for later use;

[0066] 3. Add cellulose triacetate at a mass percentage of 13 wt.% to 1,4-dioxane with a mass percentage of 54 wt.%, acetone with a mass percentage of 19 wt.%, methanol with a mass percentage of 8 wt.% and lactic acid In the mixed solution with a mass percentage of 6%, after stirring at a temperature of 40°C for 24 hours, a uniform casting solution was ob...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention relates to an osmosis membrane, in particular to a modified forward osmosis membrane and a preparation method thereof. According to the forward osmosis membrane and the preparation method thereof provided by the invention, antibacterial nano particles, especially a mixture of nano Ag and nano TiO2, are fully covered on the supporting grid layer of a membrane, so that an effective, long-term and comprehensive antibacterial effect is provided under the condition that the strength, the water flux and the salt rejection rate of the forward osmosis membrane are not reduced. According to the invention, antibacterial modification is carried out on the supporting grid of the forward osmosis membrane through antibacterial nanoparticles, especially a mixture of nano Ag and nano TiO2, so that breeding of bacteria on the forward osmosis membrane is inhibited, the forward osmosis is improved, and the safety of the whole purification and filtration system is also improved. The antibacterial forward osmosis membrane disclosed by the invention can be applied to filtration and purification of complex water sources, especially purification and filtration of eutrophicated water sources which are easy to breed bacteria.

Description

technical field [0001] The invention relates to the technical field of polymer separation membrane preparation, in particular to an antibacterial forward osmosis membrane and a preparation method thereof. Background technique [0002] The forward osmosis (FO) process is a process in which the osmotic pressure difference between the draw solution and the raw material solution is the driving force, and the water is automatically diffused from the raw water side with low osmotic pressure to the draw solution side with high osmotic pressure through the selective permeable membrane. The process does not require external pressure and energy. [0003] Different from pressure-driven membrane separation processes such as ultrafiltration, nanofiltration and reverse osmosis technology, forward osmosis can be operated at low pressure or even without pressure, so the energy consumption is low; under low pressure operation, the formation of filter cake layer caused by no pressure has the ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/72B01D71/70B01D71/42B01D71/38B01D71/26B01D71/16B01D71/02B01D69/12B01D67/00B01D61/00
CPCB01D61/002B01D71/022B01D71/024B01D71/38B01D71/72B01D71/42B01D71/26B01D71/16B01D71/70B01D69/12B01D67/0079B01D2325/48Y02A20/131B01D69/10B01D69/1071B01D69/148B01D69/02B01D67/00113B01D67/0013B01D2323/21813B01D2323/21811B01D71/381B01D2323/081B01D67/0083B01D67/0088B01D67/0097B01D69/105B01D2323/12B01D2325/04B01D2325/36
Inventor 不公告发明人
Owner BEIJING BAOSHENGTONG INT ELECTRIC ENG TECH CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com