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Download fileArmor-Structured Interconnected-Porous Membranes for Corrosion-Resistant and Highly Permeable Waste Ammonium Resource Recycling
journal contribution
posted on 2022-04-26, 15:05 authored by Dongqing Liu, Fuyun Yu, Lingling Zhong, Tao Zhang, Ying Xu, Yingjie Qin, Jun Ma, Wei WangAmmonium
recovery from wastewater by gas-permeable membranes is
promising but suffers from the tradeoff between membrane stability
and permeability under harsh operating conditions. Chemical-resistant
membranes display modest permeability due to the poor solubility and
processibility; chemically active membranes are easier to be endowed
with better permeability however hinder by instability. To resolve
such a problem, we cleverly design a novel membrane configuration
via one-step solution-electrospinning, with the chemical-active component
(low-strength fluorine polymer) as the inner skeleton to construct
interconnected porous structures and the chemical-resistant component
(high-strength fluorine polymer) as the outer armor to serve as a
protective layer. Due to the significantly enhanced mass transfer
coefficient, the interconnected-porous armor-structured membrane exhibited
much higher permeability for NH4+-N recovery,
which was 1.4 and 5 times that of the traditional PTFE membrane and
PP membrane, respectively. Through long-term intermittent and consecutive
experiments, the reusability and durability of the armor-structured
nanofibrous membrane were verified. When treating actual hoggery wastewater
with complicated water quality, the armor-structured nanofibrous membrane
also displayed robust stable performance with excellent antiwettability.
The mechanisms of membrane formation, corrosion resistance, and mass
transfer were discussed in detail.
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strength fluorine polymerharsh operating conditionscomplicated water qualitytraditional ptfe membranestructured nanofibrous membranechemically active membranesactive componentpp membranemembrane stabilitymembrane formationporous membranespermeable membranesterm intermittentstructured interconnectedstep solutionprotective layerpoor solubilitymass transferinner skeletonexcellent antiwettabilityconsecutive experimentscleverly design5 times