Patent ID: 11925905
Assignee: BEIJING BAOSHENGTONG INTERNATIONAL ELECTRIC ENGINEERING TECHNOLOGY CO., LTD.
Field: Chemical engineering (Chemistry)
Classification: CPC B  Y | IPC B

Claim 0:
1. A forward osmosis membrane, wherein the forward osmosis membrane has a sequentially stacked membrane structure, the stacked layer includes a hydrophilic support mesh and a hydrophilic polymer membrane layer, and the support mesh is non-woven or polyester screen modified by antibacterial nanoparticles; the antibacterial nanoparticle-modified support mesh is prepared by the following method: adding nano-Ag 0.1-0.5 wt. % (by weight) and nano TiO2 0.2-1 wt. % (by weight) into a 2-8 wt. % polyvinyl alcohol aqueous solution by weight, performing ultrasonic dispersion to obtain a modified suspension, immersing the polyester screen into the suspension, then obtained the antibacterial nanoparticle-modified support mesh by natural drying; the average particle size of the nano-Ag is 20 nm; the average particle size of nano-TiO2 is 5-10 nm;
when using a 0.5 mol/L sodium chloride solution by volume as a draw solution, and using a 0.01 mol/L magnesium sulfate solution by volume as a feed solution, the membrane flux can reach 8-13 L/(m2*h), the rejection of the magnesium sulfate is above 97%, the antibacterial rate is above 90%, and the performances of the membrane is not affected even after 10 days of immersion in a eutrophication-rich raw water, after washing to test, its antibacterial capability is still above 90%.