Sorbent and method for carbon dioxide capture and recovery

Abstract

A functionalized carbon dioxide sorbent of a functionalized graphene oxide (fGO) substrate having substitution sites substituted with a functional group. The functional groups can be secondary or tertiary amines, a phosphate, a sulfonate or magnetite. The sorbent can have a binder intermixed with the fGO substrate, in the form of pellets, using a hydroxyethyl cellulose binder. A method using the functionalized sorbent provided captures a CO2 from a flue gas, by passing the flue gas containing moisture and a concentration of CO2 across the sorbent packed bed of the functionalized sorbent to adsorb selectively a portion of CO2 in the flue gas onto the fGO of the sorbent. The captured CO2 can be desorbed from the sorbent by exposure to a fluid at elevated temperature and/or reduced pressure conditions sufficient to desorb the CO2, and separating and concentrating the desorbed CO2 from the fluid. The functional moieties can be at least one of a primary and secondary amine, and a secondary function group of tertiary amines, phosphates, sulfonates and/or magnetite.

Dependencies are inferred from the claim text.