▎ 摘　　要

NOVELTY - Manufacturing porous graphene filter (950), comprises: forming a first graphene filter having a first hole of first size, during deposition of carbon atoms generated from a carbon source for formation of graphene, by (a) substituting carbon atoms, in part, with a substitution atom generated from a substitution source; forming a second graphene filter having a second hole of second size, during deposition of carbon atoms generated from carbon source for forming graphene, by the step (a) as per se; and arranging first and second graphene filters in a filter body equipped with inlet and outlet. USE - The method is useful for manufacturing a porous graphene, which is useful in a filtering apparatus for separating individual materials of mixture from each other (claimed), where the mixture comprises gaseous, liquid or solid materials of different size. ADVANTAGE - The method provides the porous graphene filter, which: selectively filters a specific material from a mixture of at least two different materials; can be produced in a simple manner; does not undergo deformation at a high temperature; and exhibits improved tensile strength and compression strength. DETAILED DESCRIPTION - Manufacturing a porous graphene filter (950), comprises: forming a first graphene filter having a first hole of a first size, during deposition of carbon atoms generated from a carbon source for formation of graphene, by (a) substituting the carbon atoms, in part, with a substitution atom generated from a substitution source; forming a second graphene filter having a second hole of a second size, during deposition of carbon atoms generated from a carbon source for formation of graphene, by the step (a) as per se, where the second size is larger than the first size; and arranging the first graphene filter and the second graphene filter in a filter body equipped with an inlet and an outlet. INDEPENDENT CLAIMS are also included for: (1) a porous graphene filter, comprising: a first graphene filter, in which a first hole with a first size is formed by substituting a part of carbon atoms having a crystal defect at a covalently bonded portion in the graphene with a substitution atom; a second graphene filter, in which a second hole with a second size is formed by substituting a part of carbon atoms having a crystal defect at a covalently bonded portion in the graphene with a substitution atom; and a filter body, in which the first and second graphene filters are immobilized against a path through which a mixture of many materials moves after the mixture is introduced into the filter body; and (2) a filtering apparatus (900), comprising: a mixture feeder for intermittently providing a predetermined amount of a mixture comprising materials different in size from each other; the graphene filter comprising a filter body equipped with an inlet through which the mixture is introduced into the filter body, and at least two outlets at a side of the filter body; and at least one graphene film having holes formed in it, positioned between the outlets within the filter body for separating the individual materials of the mixture from each other; and a recovery unit (960) connected to the outlets for recovering the separated individual materials. DESCRIPTION OF DRAWING(S) - The figure shows a block diagram of the filtering apparatus. Filtering apparatus (900) Mixture reservoir (912) Porous graphene filter (950) Recovery unit (960) Valve controller (980)