Premium
The Counterion Effect of Imidazolium‐Type Poly(ionic liquid) Brushes on Carbon Dioxide Adsorption
Author(s) -
Li Na,
Qu Rong,
Han Xiaoyu,
Lin Weiran,
Zhang Haining,
Zhang Zhenyu J.
Publication year - 2019
Publication title -
chempluschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.801
H-Index - 61
ISSN - 2192-6506
DOI - 10.1002/cplu.201800636
Subject(s) - ionic liquid , hexafluorophosphate , adsorption , atom transfer radical polymerization , polymer , counterion , desorption , polymer chemistry , chemistry , imidazole , substituent , chemical engineering , inorganic chemistry , materials science , polymerization , organic chemistry , ion , catalysis , engineering
Imidazolium‐based poly(ionic liquid) brushes were attached to spherical silica nanoparticles bearing various functionalities by using a surface‐initiated atom transfer radical polymerization (“grafting from” technique). A temperature‐programmed desorption process was applied to evaluate and analyze the carbon dioxide adsorption performance of the synthesized polymer brushes. The confined structure of the surface‐attached polymer chains facilitates gas transport and adsorption, leading to an enhanced adsorption capacity of carbon dioxide molecules compared with pure polymer powders. Temperature‐programmed desorption profiles of the synthesized polymer brushes after carbon dioxide adsorption reveal that the substituent groups on the nitrogen atom at the 3‐position of the imidazole ring, as well as the associated anions significantly affect the adsorption capacity of functionalized poly(ionic liquid) brushes. Of the tested samples, amine‐functionalized poly(ionic liquid) brushes associated with hexafluorophosphate ions exhibit the highest carbon dioxide adsorption capacity of 2.56 mmol g −1 (112.64 mg g −1 ) at 25 °C under a carbon dioxide partial pressure of 0.2 bar.