This disclosure relates to the fabrication of high-performance thin film composite (TFC) reverse osmosis (RO) membranes comprising a thin polyamide rejection layer (thickness of 100-200 nanometer), a porous substrate including polysulfone (PSf) layer (thickness of 40-50 micron) cast on polyester nonwoven fabric (thickness of 100 micron). Hydrophilic and antibacterial TFC polyamide RO membranes were developed by incorporating green Lignin and nanostructured silver-based metal organic frameworks (MOFs) into the selective layer. The polyamide layer of TFC RO membranes was fabricated on the porous PSf substrate by interfacial polymerization between aqueous monomer solutions containing MPD, and adequate additives in water and organic monomer solutions containing TMC in the mixture of hexane and co-solvents. The optimized produced RO membranes were provided water flux of 95-100 LMH and sodium chloride (NaCl) salt rejection of 98.5-99.0% during filtration of 2000 ppm NaCl solution at 225 psi pressure, and water flux of 55-60 LMH and sodium chloride (NaCl) salt rejection of 98.6-98.9% during filtration of 35000 ppm NaCl solution at 800 psi pressure. This disclosure also relates to developing a roll-to-roll PSf membrane as a substrate for making TFC RO membranes for water desalination

A membrane sorbent is described, which comprises 1-6 wt % silicon carbide nanoparticles dispersed in a polymer matrix. The polymer matrix may comprise polysulfone and polyvinylpyrrolidone. The membrane sorbent is used for separating oil from a contaminated water mixture. The silicon carbide nanoparticles of the membrane sorbent may be made from rice husk ash.

The present invention is related to an osmosis membrane, specifically to a modified forward osmosis membrane and the method of preparing same. The inventive forward osmosis membrane has a modified membrane structure including a hydrophilic support mesh and a hydrophilic polymer membrane layer mixed antioxidant. The hydrophilic polymer membrane layer with antioxidant not only has high salt rejection, but also ensures high oxidation resistance under a strong oxidation environment, and can be used safely and stably. The inventive oxidation resistant forward osmosis membrane has the advantages of improving the efficiency of purifying and separating water, extending the service life, significantly reducing the operation cost of the forward osmosis membrane system. The inventive forward osmosis membrane can be applied in the industries of treatment of strong oxidation waste water, water purifying, filtration and purification of food and medicine filtering and so on.