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Interlayered Interface of a Thin Film Composite Janus Membrane for Sieving Volatile Substances in Membrane Distillation
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2023-04-27 , DOI: 10.1021/acs.est.3c00093 Zhigao Zhu 1 , Zhu Liu 2 , Guangming Tan 1 , Junwen Qi 1 , Yujun Zhou 1 , Jiansheng Li 1
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2023-04-27 , DOI: 10.1021/acs.est.3c00093 Zhigao Zhu 1 , Zhu Liu 2 , Guangming Tan 1 , Junwen Qi 1 , Yujun Zhou 1 , Jiansheng Li 1
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Hypersaline wastewater treatment using membrane distillation (MD) has gained significant attention due to its ability to completely reject nonvolatile substances. However, a critical limitation of current MD membranes is their inability to intercept volatile substances owing to their large membrane pores. Additionally, the strong interaction between volatile substances and MD membranes underwater tends to cause membrane wetting. To overcome these challenges, we developed a dual-layer thin film composite (TFC) Janus membrane through electrospinning and sequential interfacial polymerization of a polyamide (PA) layer and cross-linking a polyvinyl alcohol/polyacrylic acid (PP) layer. The resulting Janus membrane exhibited high flux (>27 L m–2 h–1), salt rejection of ∼100%, phenol rejection of ∼90%, and excellent resistance to wetting and fouling. The interlayered interface between the PA and PP layer allowed the sieve of volatile substances by limiting their dissolution–diffusion, with the increasing hydrogen bond network formation preventing their transport. In contrast, small water molecules with powerful dynamics were permeable through the TFC membrane. Both experimental and molecular dynamics simulation results elucidated the sieving mechanism. Our findings demonstrate that this type of TFC Janus membrane can serve as a novel strategy to design next-generation MD membranes against volatile and non-volatile contaminants, which can have significant implications in the treatment of complex hypersaline wastewater.
中文翻译：
用于在膜蒸馏中筛分挥发性物质的薄膜复合 Janus 膜的层间界面
使用膜蒸馏 (MD) 处理高盐废水因其能够完全去除非挥发性物质而受到广泛关注。然而，当前 MD 膜的一个关键限制是它们由于膜孔大而无法拦截挥发性物质。此外，水下挥发性物质与 MD 膜之间的强烈相互作用往往会导致膜润湿。为了克服这些挑战，我们通过聚酰胺 (PA) 层的静电纺丝和顺序界面聚合以及聚乙烯醇/聚丙烯酸 (PP) 层的交联开发了双层薄膜复合材料 (TFC) Janus 膜。由此产生的 Janus 膜表现出高通量 (>27 L m –2 h –1), 脱盐率 ~100%, 苯酚脱除率 ~90%, 以及优异的抗湿性和抗污性。PA 和 PP 层之间的夹层界面通过限制挥发性物质的溶解-扩散来筛分挥发性物质，增加的氢键网络形成阻止了它们的传输。相反，具有强大动力的小水分子可透过 TFC 膜。实验和分子动力学模拟结果都阐明了筛分机制。我们的研究结果表明，这种类型的 TFC Janus 膜可以作为一种新策略来设计下一代 MD 膜以抵抗挥发性和非挥发性污染物，这对复杂的高盐废水的处理具有重要意义。
更新日期：2023-04-27
中文翻译：
用于在膜蒸馏中筛分挥发性物质的薄膜复合 Janus 膜的层间界面
使用膜蒸馏 (MD) 处理高盐废水因其能够完全去除非挥发性物质而受到广泛关注。然而，当前 MD 膜的一个关键限制是它们由于膜孔大而无法拦截挥发性物质。此外，水下挥发性物质与 MD 膜之间的强烈相互作用往往会导致膜润湿。为了克服这些挑战，我们通过聚酰胺 (PA) 层的静电纺丝和顺序界面聚合以及聚乙烯醇/聚丙烯酸 (PP) 层的交联开发了双层薄膜复合材料 (TFC) Janus 膜。由此产生的 Janus 膜表现出高通量 (>27 L m –2 h –1), 脱盐率 ~100%, 苯酚脱除率 ~90%, 以及优异的抗湿性和抗污性。PA 和 PP 层之间的夹层界面通过限制挥发性物质的溶解-扩散来筛分挥发性物质，增加的氢键网络形成阻止了它们的传输。相反，具有强大动力的小水分子可透过 TFC 膜。实验和分子动力学模拟结果都阐明了筛分机制。我们的研究结果表明，这种类型的 TFC Janus 膜可以作为一种新策略来设计下一代 MD 膜以抵抗挥发性和非挥发性污染物，这对复杂的高盐废水的处理具有重要意义。
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