▎ 摘　　要

NOVELTY - A method for forming a large-area graphene layer on a porous substrate by chemical vapor deposition process is given. First, a carbon layer is formed on the porous substrate by chemical vapor deposition. Then the carbon layer is subjected to catalytic graphitization to convert it to a graphite layer. Finally, the graphite layer is subjected to liquid-phase exfoliation to yield a much thinner graphene layer. This invention is to directly form a large-area graphene layer on a porous substrate. Further, primary channels associated with the porous substrate are connecting with secondary channels associated with the graphene layer. As a result, such a supported large-area graphene layer could be used for filtration and separation of solids from liquid, adsorption of solute and ions in the solution, separation of molecules of different sizes in the solution, and separation of different gases in a gas stream. Many types of enhancement of separation and purification are achieved accordingly.