▎ 摘　　要

NOVELTY - The method involves providing graphene on a sacrificial support layer. The graphene membrane subjected to transient ozone gas pulse at reactor temperature comprised between about 120 to 300 degreeC. The ozone purged from the reactor chamber during or right after the transient pressurized ozone gas pulse. The ozone treated graphene membrane cooled down to room temperature. USE - Method for preparation of gas selective separation filter for gas mixture separation in context of carbon capture for separating of carbon dioxide (CO2) from nitrogen hydride and hydrocarbons from gas waste or effluents using atom thick graphene porous membrane. ADVANTAGE - The method enables to prepare gas selective separation filter that has low density of intrinsic vacancy defects even for large area filter surface, which is cost effective, has good gas selectivity, and allows fine adjustment of the molecular sieving resolution. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for gas selective filter for separating carbon dioxide from nitrogen hydride and hydrocarbons from gas waste or effluents. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of method for preparation of gas selective separation filter. Reactor chamber (4) Chamber outlet (8) Vacuum control valve (17) Heating unit (18) Temperature sensor (20)