▎ 摘　　要

NOVELTY - Removing carbon dioxide from a gas involves providing a gaseous feed stream including a carbon dioxide gas, adsorbing the carbon dioxide gas with a porous carbon sorbent, de-adsorbing the carbon dioxide, and combining the carbon dioxide with hydrogen gas to produce at least one of methane or methanol. USE - Method for removing carbon dioxide from a gas. ADVANTAGE - The method has enhanced adsorption and has provided higher efficiency, fast cycling and response times, reduced thermal management requirements, lower capital costs, and smaller method footprints. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: 1. a carbon dioxide separation system, which comprises a gaseous stream including carbon dioxide, an activated carbon filter comprising nanopores, where the gaseous stream including carbon dioxide is configured to flow through at least a portion of the activated carbon filter. The activated carbon filter is configured to separate the gaseous stream into a carbon dioxide-rich stream and a carbon dioxide-depleted stream, and an adsorption system is configured to separate the carbon dioxide-rich stream; and 2. a method for producing carbon dioxide, which involves passing a carbon dioxide-containing gas through a graphene-based membrane, preparing an apparatus comprising a porous dielectric adsorbent material in between and in electrical communication with a first electrical conductor and a second electrical conductor, applying an electric field across the porous dielectric adsorbent material, passing the carbon dioxide-containing gas into the porous dielectric adsorbent material, and removing the electric field and releasing the carbon dioxide, and capturing the carbon dioxide, where the carbon dioxide couples to the first electrical conductor and the second electrical conductor.