TY - JOUR
T1 - Enhanced CO2 separation in membranes with anion-cation dual pathways
AU - Yan, Zhikun
AU - Zhang, Mengyao
AU - Shi, Feng
AU - Zhu, Bin
AU - Liu, Min
AU - Wang, Shaofei
AU - Li, Yifan
AU - Nunes, Suzana Pereira
N1 - KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: The study was financially supported by National Natural Science Foundation of China (21878277 and 21506196), Natural Science
Foundation of Henan province (182300410268), China Postdoctoral Science Foundation (2015M570633 and 2017T100538), and
Outstanding Young Talent Research Fund of Zhengzhou University (1521324002) and King Abdullah University of Science and Technology (KAUST), Saudi Arabia. We also gratefully acknowledge the financial support from China Scholarship Council, and the instrument support from Center of Advanced Analysis & Computational Science, Zhengzhou University.
PY - 2020/2/28
Y1 - 2020/2/28
N2 - The factors contributing to the water-facilitated CO2 capture in membranes are investigated. Since CO2 transports through such hydrated membrane mainly in the form of bicarbonate, there is a pressing need for exploring the ionic transport mechanism. Herein, a series of composite charged membranes comprising a negatively charged polymer matrix and positively charged filler is proposed. For that, polymer brushes bearing imidazolium cations are grafted on graphene oxide and then dispersed in sulfonated poly (ether ether ketone) (SPEEK). Compared with the pristine SPEEK membranes, a significant enhancement in both CO2 permeability and CO2/N2 selectivity is observed. The encouraging results are discussed considering proton conductivity and bicarbonate diffusivity. More interestingly, the membranes show simultaneously higher CO2 permeability and CO2/N2 selectivity when the operating pressure or temperature are increased, supporting the occurrence of ionic transport mechanism arising from the unique anion-cation dual pathways at the polymer-filler interface.
AB - The factors contributing to the water-facilitated CO2 capture in membranes are investigated. Since CO2 transports through such hydrated membrane mainly in the form of bicarbonate, there is a pressing need for exploring the ionic transport mechanism. Herein, a series of composite charged membranes comprising a negatively charged polymer matrix and positively charged filler is proposed. For that, polymer brushes bearing imidazolium cations are grafted on graphene oxide and then dispersed in sulfonated poly (ether ether ketone) (SPEEK). Compared with the pristine SPEEK membranes, a significant enhancement in both CO2 permeability and CO2/N2 selectivity is observed. The encouraging results are discussed considering proton conductivity and bicarbonate diffusivity. More interestingly, the membranes show simultaneously higher CO2 permeability and CO2/N2 selectivity when the operating pressure or temperature are increased, supporting the occurrence of ionic transport mechanism arising from the unique anion-cation dual pathways at the polymer-filler interface.
UR - http://hdl.handle.net/10754/661665
UR - https://linkinghub.elsevier.com/retrieve/pii/S2212982019313186
UR - http://www.scopus.com/inward/record.url?scp=85083629431&partnerID=8YFLogxK
U2 - 10.1016/j.jcou.2020.02.016
DO - 10.1016/j.jcou.2020.02.016
M3 - Article
SN - 2212-9820
VL - 38
SP - 355
EP - 365
JO - Journal of CO2 Utilization
JF - Journal of CO2 Utilization
ER -