Abstract
Polydimethylsiloxane (PDMS) pervaporation membranes for n-butanol recovery were fabricated using various crosslinkers: a conventional tetra-functional crosslinker and tri-functional crosslinkers containing different organic (hexyl, cyclohexyl and phenyl) groups. Irrespective of the feed solution conditions, the membranes prepared using tri-functional crosslinkers exhibited a higher permeate flux than the membrane prepared using the tetra-functional crosslinker because their less crosslinked structures increased the free volume. Importantly, among the fabricated membranes, the membrane prepared using the phenyl-containing tri-functional crosslinker exhibited the highest separation factor with a remarkably high permeate flux even under high alcohol concentration and elevated temperature conditions. Its superior pervaporation performance was attributed to its highest hydrophobicity and excellent thermal stability, which are imparted by the phenyl group in the crosslinker, combined with the tri-functional structure of the crosslinker. Our proposed strategy provides an effective and facile method to fabricate high performance pervaporation membranes for alcohol recovery.
Original language | English |
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Article number | 116142 |
Journal | Separation and Purification Technology |
Volume | 235 |
DOIs | |
Publication status | Published - 2020 Mar 18 |
Bibliographical note
Funding Information:This research was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIP) ( NRF-2019R1A2C1002333 , 2018R1A4A1022194 , 2017M3D3A1A01037006 and 2019M3E6A1064103 ) and Korean Ministry of Environment as “Global Top Project ( 2016002100007 )”.
Publisher Copyright:
© 2019 Elsevier B.V.
Keywords
- Crosslinker
- Pervaporation membrane
- Polydimethylsiloxane
- Thermal resistance
- n-Butanol recovery
ASJC Scopus subject areas
- Analytical Chemistry
- Filtration and Separation