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Reversible CO 2 Capture by Conjugated Ionic Liquids through Dynamic Covalent Carbon–Oxygen Bonds
Author(s) -
Pan Mingguang,
Cao Ningning,
Lin Wenjun,
Luo Xiaoyan,
Chen Kaihong,
Che Siying,
Li Haoran,
Wang Congmin
Publication year - 2016
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201600402
Subject(s) - ionic liquid , covalent bond , desorption , thermogravimetric analysis , chemisorption , conjugated system , ionic bonding , chemistry , enthalpy , ion , absorption (acoustics) , delocalized electron , photochemistry , materials science , polymer , adsorption , organic chemistry , catalysis , thermodynamics , physics , composite material
The strong chemisorption of CO 2 is always accompanied by a high absorption enthalpy, and traditional methods to reduce the absorption enthalpy lead to decreased CO 2 capacities. Through the introduction of a large π‐conjugated structure into the anion, a dual‐tuning approach for the improvement of CO 2 capture by anion‐functionalized ionic liquids (ILs) resulted in a high capacity of up to 0.96 molCO2 mol - 1ILand excellent reversibility. The increased capacity and improved desorption were supported by quantum chemical calculations, spectroscopic investigations, and thermogravimetric analysis. The increased capacity may be a result of the strengthened dynamic covalent bonds in these π‐electron‐conjugated structures through anion aggregation upon the uptake of CO 2 , and the improved desorption originates from the charge dispersion of interaction sites through the large π‐electron delocalization. These results provide important insights into effective strategies for CO 2 capture.