ACS omega | VOL. 5
Direct CO2 Capture from Air via Crystallization with a Trichelating Iminoguanidine Ligand.


Effectively reducing the concentration of CO2 in ambient air is essential to mitigate global warming. Existing carbon capture and storage technology can only slow down the carbon emissions of large point sources but can not treat the already accumulated CO2 in the environment. Herein, we demonstrated a simple direct CO2 capture method from air via reactive crystallization with a new trichelating iminoguanidine ligand (BTIG). It could strongly bind CO2 to form insoluble carbonate crystals that could be easily isolated. In the crystal, CO2 was transformed to CO3 2-and trapped in a dense hydrogen bonding network in terms of carbonate-water clusters. This capture process was reversible, and the BTIG ligand could be regenerated by heating the BTIG-CO2 crystal at a mild temperature, which was much lower than the decomposition temperature of CaCO3 (∼ 900 °C). Thermodynamic and kinetics analyses indicate that the crystallization process was exothermic with an enthalpy of-292 kJ/mol, and the decomposition energy consumption was 169 kJ per mol CO2. In addition, BTIG could also be employed for CO2 capture from flue gas with a capacity of 1.46 mol/mol, which was superior to that of most of the reported sorbents.

Concepts Powered ByUnsilo

Crystallization Search on this concept
Carbon Search on this concept
Direct CO2 Capture Search on this concept
Large Point Sources Search on this concept
Temperature Search on this concept
Reactive Crystallization Search on this concept
Heating Search on this concept
Mol CO2 Search on this concept
Hydrogen Search on this concept
Concentration Search on this concept

Similar Papers

Coronavirus Pandemic

You can also read COVID related content on R COVID-19

R ProductsCOVID-19


Creating the world’s largest AI-driven & human-curated collection of research, news, expert recommendations and educational resources on COVID-19

COVID-19 Dashboard