Direct capture and separation of CO2 from air

Abstract

Direct air capture (DAC) has attracted increasing interest and investment over the past few years. There are a fast-growing number of companies that entered the field and demonstrated DAC carbon removal setups and potential. However, current DAC methods are still based on solid absorbents or alkali solutions approaches which have low capture efficiency and low energy efficiency. This highlight proposed a promising CO2 capture technology, an electric energy driven closed-loop system for the direct removal of CO2 from ambient air which are based on two individual technologies: Polyam-N-Cu hybrid system promoted CO2 capture with ocean as anthropogenic CO2 sink and a chloride-mediated electrochemical pH swing system to remove CO2 from oceanwater.