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Polypyrrole‐aided surface decoration of graphene oxide nanosheets as fillers for poly(ether‐ b ‐amid) mixed matrix membranes to enhance CO 2 capture
Author(s) -
Asghari Morteza,
Saadatmandi Samaneh,
Parnian Mohammad Javad
Publication year - 2021
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.6567
Subject(s) - membrane , permeation , polypyrrole , selectivity , materials science , chemical engineering , graphene , barrer , oxide , gas separation , x ray photoelectron spectroscopy , polymer chemistry , polymer , nanotechnology , chemistry , organic chemistry , catalysis , composite material , polymerization , biochemistry , engineering , metallurgy
Summary Modified graphene oxide (GO) nanosheets as fillers within poly(ether‐ b ‐amid) (PEBA) copolymer as matrix were used for mixed matrix membranes (MMMs) fabrication to improve CO 2 capture. The GO nanosheets were modified by polypyrrole (PPy) and zinc cations. The former that have conjugated N‐containing groups provided a high degree of affinity toward CO 2 , and the latter has facilitated the gas molecules transport through the gas channel passages. The different modified GO nanosheets were characterized by HRTEM, FT‐IR, FESEM, XRD, and XPS analyses. Also, the FT‐IR, XRD, AFM, and SEM methods were used for the structural and morphological characterizations of the prepared MMMs with 0.1 wt% of the nanofiller. Gas permeation tests for CH 4 , N 2 , and CO 2 were then performed for all prepared membranes. Compared to the neat PEBA membrane, the selectivity of both CO 2 /CH 4 and CO 2 /N 2 for PEBA‐GO‐PPy membrane increased up to 62% and 51% and for the PEBA‐GO‐PPy‐Zn membrane increased up to 58% and 56%, respectively. Furthermore, the PEBA‐GO‐PPy‐Zn disclosed a 10% increase in permeability of CO 2 than the neat membrane. For PEBA‐GO‐PPy MMM, the permeability of CO 2 was 122.4 Barrer, and the selectivity of CO 2 /CH 4 and CO 2 /N 2 was 29.8 and 122.5, respectively. Moreover, the gas separation results for PEBA‐GO‐PPy‐Zn MMM were about 131.8 Barrer for CO 2 permeability and 30.7 and 119.2 for CO 2 /CH 4 and CO 2 /N 2 selectivities, respectively. Besides, the CO 2 /N 2 selectivity of PEBA‐GO‐PPy and PEBA‐GO‐PPy‐Zn overcomes the Robeson's upper bound.