Composite particles and their use in the selective capture and release of carbon dioxide with use of dielectric heating

A method for capturing carbon dioxide, the method comprising contacting a gaseous source containing CO2 with a carbon capture composite particle composition comprising a core and a shell encapsulating the core to result in capture of CO2 from the gaseous source in the carbon capture composite particle, wherein:

• (i) the core of said carbon capture composite particle comprises a liquid sorbent reactive with CO2 and forms a sorbent-CO2 complex upon contact with CO2;
• and
• (ii) the shell of said carbon capture composite particle encapsulates said core and comprises a multiplicity of hydrophobic-coated oxide particles, wherein gas-permeable spacings are present between the hydrophobic-coated oxide particles to permit passage of the gaseous source to the liquid sorbent in the core, and said hydrophobic-coated oxide particles have a main group or transition metal oxide inner portion encapsulated by a coating of hydrophobic molecules.

An apparatus for regenerating a sorbent liquid in a sorbent-CO2 complex, the apparatus comprising:

• (i) a column for housing the sorbent-CO2 complex and through which a gas can flow, wherein said column is partially or completely microwave-transparent or radiofrequency-transparent to permit microwave or radiofrequency radiation to be transmitted through the column to contact the sorbent-CO2 complex;
• and
• (ii) a device for generating microwave or radiofrequency radiation.