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AEL Zeolite Nanosheet-Polyamide Nanocomposite Membranes on α‑Alumina Hollow Fibers with Enhanced Pervaporation Properties
journal contribution
posted on 2020-08-07, 15:16 authored by Akshay Korde, Byunghyun Min, Arvind Ganesan, Shaowei Yang, Zhongzhen Wang, Aristotle Grosz, Christopher W. Jones, Sankar NairPolyamide (PA)-based nanofiltration
membranes fabricated via interfacial
polymerization (IP) are widely studied for water desalination. The
formation of hybrid (nanocomposite) membranes comprising PA along
with nanoporous materials has the potential to increase water flux
while maintaining salt rejections with low energy input. We report
a new type of nanocomposite membrane comprising high-aspect-ratio
AEL molecular sieve nanosheet coating and PA, fabricated on α-alumina
hollow fibers. We find that the AEL nanosheet coating acts as a semipermeable
reservoir to store diamine molecules and thus control the interfacial
polymerization to form thin, continuous AEL/PA nanocomposite membranes
on the ceramic fiber surfaces. The nanocomposite AEL/PA membranes
are ∼400 nm thick and exhibit high water permeance and NaCl
rejection in pervaporative desalination at low (2 g/L NaCl) and high
(36 g/L NaCl) salt concentrations representative of brackish water
and seawater, respectively. The membranes are stable over the longer-term
operation for 150 h in pervaporative desalination. This work suggests
a new strategy for developing high flux PA-based thin-film nanocomposite
membranes for water treatment by utilizing high-aspect-ratio microporous
zeolite nanosheets. The preparation of these membranes on ceramic
hollow fibers is also useful for their scalable fabrication.
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salt concentrations representativeEnhanced Pervaporation Properties P...increase water fluxAEL Zeolite Nanosheet-Polyamide Nan...high-aspect-ratio microporous zeoli...pervaporative desalinationsieve nanosheet coatingNaClflux PA-based thin-film nanocomposi...AEL nanosheet coating actsstore diamine moleculesIP
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