▎ 摘　　要

NOVELTY - Making and using a graphene oxide membrane, comprises: dispersing graphene oxide flakes in an aqueous medium to form a graphene oxide solution; applying the graphene oxide solution to a substrate to form a graphene oxide membrane; and separating a stream including at least two isotopic forms of water into a permeate and a retentate using the graphene oxide membrane. The permeate has an increased concentration of light water relative to the retentate. USE - The process is useful for making and using a graphene oxide membrane for: separating a stream including at least two isotopic forms of water into a permeate and a retentate, where the permeate has an increased concentration of light water relative to the retentate, where the stream includes waste water stream including elevated levels of tritium from a nuclear power plant (all claimed); filtering water according to its isotopic forms; for separating deuterium oxide and/or tritium oxide from the more abundant isotopic form of water containing hydrogen atoms having no neutrons; and for industries comprising for obtaining heavy and/or super heavy water for use in life science research, spectroscopy, neutrino detection etc. ADVANTAGE - The process provides graphene oxide membrane: which allows separation of molecules from one another due to a wide variety of different characteristics e.g. molecular weights of particular molecules, physical and/or chemical characteristics comprising bond angle and/or bond length between the molecules that may be difficult in other filtration processes; allows to remove tritiated water from waste streams from nuclear power plant, prior to releasing the water into the environment to limit the detrimental impact of tritiated water on living organisms and on the environment; and allows for single layer of light water molecules that can slide along the surface of the membrane with little or no friction.