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Novel sandwich-like membrane with hydrophilic-omniphobic-hydrophilic structure for sustainable water recovery in membrane distillation
Resources, Conservation and Recycling ( IF 13.2 ) Pub Date : 2022-09-12 , DOI: 10.1016/j.resconrec.2022.106646
Long-Fei Ren, Jun Li, Yubo Xu, Jiahui Shao, Yiliang He

Membrane distillation (MD) is attractive for water recovery from surfactant-stabilized oil-in-water emulsion due to its unique characteristics. To address the membrane fouling and wetting issues, a novel hydrophilic-omniphobic-hydrophilic sandwich-like membrane (PFZP) was firstly developed. Top PDA skin layer induced the hydration shell facing feed, which endowed membrane with high energy barriers (0.12 kT) to limit free hexadecane deposition. Omniphobic substrate (FZP) effectively avoided the deposition of free sodium dodecyl sulfate (SDS) and hexadecane-SDS aggregate. Bottom PDA skin layer was beneficial to maintain transmembrane temperature difference and driving force. Besides, both PDA layers (∼4.1 μm) partly intruded into FZP substrate to shorten water vapor transmembrane transfer path. Compared with pristine membrane, PFZP membrane displayed greatly improved anti-fouling, anti-wetting and water recovery performance with stable water flux (18.0 LMH) and high salt rejection (99.99%). Obtained findings further improved the understanding of robust MD membrane design, its anti-fouling, mass and heat transfer mechanism.



中文翻译:

具有亲水-全疏-亲水结构的新型夹层膜用于膜蒸馏中的可持续水回收

由于其独特的特性,膜蒸馏 (MD) 对从表面活性剂稳定的水包油乳液中回收水具有吸引力。为了解决膜污染和润湿问题,首先开发了一种新型的亲水-全疏-亲水三明治状膜(PFZP)。顶部 PDA 表层诱导水化壳面向进料,这赋予膜高能垒 (0.12 kT) 以限制游离十六烷沉积。全疏底物 (FZP) 有效地避免了游离十二烷基硫酸钠 (SDS) 和十六烷-SDS 聚集体的沉积。PDA底部皮层有利于维持跨膜温差和驱动力。此外,两个 PDA 层(~4.1 μm)部分侵入 FZP 基板以缩短水蒸气跨膜传输路径。与原始膜相比,PFZP膜的防污、防润湿和水回收性能有了很大提高,水通量稳定(18.0 LMH),脱盐率高(99.99%)。获得的研究结果进一步提高了对稳健 MD 膜设计、其防污、传质和传热机制的理解。

更新日期:2022-09-14
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