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Synergistic Combination of the Capillary Effect of Collagen Fibers and Size-Sieving Merits of Metal–Organic Frameworks for Emulsion Separation with High Flux
journal contribution
posted on 2020-08-06, 22:21 authored by Hanzhong Xiao, Yiwen Cui, Yujia Wang, Huifang Li, Guangyan Chen, Xin Huang, Bi ShiSize-sieving
is an effective strategy for emulsion separation.
However, the poly-dispersed porous nature of conventional size-sieving
materials compromises their separation performances. Distinctive from
poly-dispersed porous size-sieving materials, microporous metal–organic
frameworks (MOFs) have homogeneous and uniform microporous channels
that are promising to present high porosity utilization with exceptional
demulsifying capability for both microemulsion and nanoemulsion. However,
the internal diffusion kinetics of microporous MOFs dominate the transport
behaviors of liquid inside their microporous channels, which poses
a major kinetics obstacle for achieving high separation flux. Herein,
we developed composite fibers by using hierarchically fibrous structured
collagen fibers (CFs) as transport kinetics-promotable channels and
microporous MOFs (ZIF-8 or HKUST-1) in situ-grown
on CFs as a size-sieving layer. CFs feature a capillary effect that
induces fast liquid transport along the fibers, which alleviates the
kinetics shortcomings of microporous MOFs, thus boosting the separation
flux. A synergistic effect was proven to exist between the size-sieving
merits of MOFs and capillary effect of CFs. The as-prepared composite
fibers realized the ultrafast separation of surfactant-stabilized
micro- and nanoemulsions, showing two orders of magnitude flux enhancement
on those of commercial double-sided polyvinylidene fluoride membrane
and double-sided polytetrafluoroethylene membrane. These investigations
demonstrated a new conceptual strategy for developing size-sieving
materials with high flux.
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double-sided polytetrafluoroethylen...ZIFmicroporous MOFsHigh Flux Size-sievingdouble-sided polyvinylidene fluorid...magnitude flux enhancementcapillary effectsize-sieving materialsHKUSTuniform microporous channelsCFseparation fluxtransport kinetics-promotable channelssize-sieving materials compromises
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