The Counterion Effect of Imidazolium-Type Poly(ionic liquid) Brushes on Carbon Dioxide Adsorption

Na Li, Rong Qu, Xiaoyu Han, Weiran Lin*, Haining Zhang, Zhenyu J. Zhang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)281-288
Number of pages8
Issue number3
Publication statusPublished - Mar 2019

Bibliographical note

Funding Information:
This work was supported by the Natural Science Foundation of China under grant numbers of 21576216 and 21878239, and International Cooperation and Exchanges Projects of Hubei Province (2017AHB057).

Publisher Copyright:
© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

Copyright 2019 Elsevier B.V., All rights reserved.


  • CO adsorption
  • nanoparticles
  • poly(ionic liquid)s
  • polymer brushes
  • surfaces

ASJC Scopus subject areas

  • Chemistry(all)


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