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Polydimethylsiloxane/postmodified MIL‐53 composite layer coated on asymmetric hollow fiber membrane for improving gas separation performance
Author(s) -
Zhu Haitao,
Jie Xingming,
Wang Lina,
Liu Dandan,
Cao Yiming
Publication year - 2017
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.44999
Subject(s) - permeance , permeation , materials science , polydimethylsiloxane , membrane , fiber , gas separation , chemical engineering , composite number , adsorption , layer (electronics) , coating , hollow fiber membrane , composite material , chemistry , organic chemistry , biochemistry , engineering
Composite layer containing postmodified MIL‐53 (P‐MIL‐53) was exploited to be coated on as‐fabricated asymmetric hollow fiber membrane for improving gas separation performance. The morphology and pore size distribution of P‐MIL‐53 particles were characterized by SEM and N 2 adsorption isotherm. The EDX mapping and FTIR spectra were performed to confirm the presence of P‐MIL‐53 deposited on the outer surface of hollow fiber membranes. The results of pure gas permeation measurement indicated that incorporation of P‐MIL‐53 particles in coating layer could improve permeation properties of hollow fiber membranes. By varying coating times and P‐MIL‐53 content, the membrane coated with PDMS/15%P‐MIL‐53 composite by three times achieved best performance. Compared to pure PDMS coated membrane, CO 2 permeance was enhanced from 29.96 GPU to 40.24 GPU and ideal selectivity of CO 2 /N 2 and CO 2 /CH 4 also increased from 23.28 and 26.95 to 28.08 and 32.03, respectively. The gas transport through composite membrane was governed by solution‐diffusion mechanism and CO 2 preferential adsorption of P‐MIL‐53 contributed to considerable increase of CO 2 solubility resulting in accelerated permeation rate. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44999.