▎ 摘　　要

NOVELTY - A membrane (52) comprises greater than or equal to 70 wt.% crosslinked graphene oxide sheets (50) and has a thickness of greater than or equal to 0.2 microns. USE - Membranes used in article and filter media (claimed) used for ultrafiltration and nanofiltration applications. Uses include but are not limited to concentration of molecules such as whey, lactose, desalting of lactose, dye, chemicals and pharmaceuticals, fractionation of sugars, extraction of nutraceuticals and plant oils, recovery of black liquor, catalyst and solvent, and purification of pharmaceutical, chemical and fuel. ADVANTAGE - The membranes has improved separation efficiency, enhanced resistance to fouling, high permeability, compatibility, physical stability and lifespan. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) filter media; (2) method of converting graphene oxide sheet; (3) method of forming membrane; and (4) article. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic of a graphene oxide membrane under various conditions. Graphene oxide sheets (50) Membrane (52) Crosslinked membrane (54) D-spacing (58,60)