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Abstract

A method for regenerating a carbon dioxide (CO₂) sorbent material, the method comprising: (i) contacting a sorbent-CO₂ complex in an aqueous solution containing a reversible photoacid, wherein the CO₂ in the sorbent-CO₂ complex is in the form of bicarbonate, carbonate, or carbamate; and (ii) exposing the aqueous solution to electromagnetic radiation having a wavelength that induces proton release from the photoacid and subsequent protonation of the bicarbonate, carbonate, or carbamate in the sorbent-CO₂ complex to result in release of CO₂ and water and regeneration of the sorbent material. The method may also include re-using the regenerated sorbent to capture carbon dioxide. The sorbent may be, for example, an amino acid (e.g., glycine), alkylamine, alkanolamine, or alkali hydroxide. The reversible photoacid may more particularly be a metastable-state photoacid.

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First Claim