Aqueous Electrochemical and pH Studies of Redox-Active Guanidino Functionalized Aromatics for CO₂ Capture.

ABSTRACT: Escalating levels of carbon dioxide (CO₂) in the atmosphere have motivated interest in CO₂ capture and concentration from dilute streams. A guanidino-functionalized aromatic 1,4-bis(tetramethylguanidino)benzene (1,4-btmgb) was evaluated both as a redox-active sorbent and as a pH swing mediator for electrochemical CO₂ capture and concentration. Spectroscopic and crystallographic studies demonstrate that 1,4-btmgb reacts with CO₂ in water to form 1,4-btmgbH₂(HCO₃ ^-)₂. The product suggests that 1,4-btmgb could be used in an aqueous redox pH swing cycle for the capture and concentration of CO₂. The synthesis and characterization of the mono- and diprotonated forms (1,4-btmgbH⁺ and 1,4-

SUBMITTER: Li CJ 

PROVIDER: S-EPMC11311035 | biostudies-literature | 2024 Aug

REPOSITORIES: biostudies-literature