Abstract In this work, a lower melting point of HALAR® Ethylene-Chlorotrifluoroethylene (LMP ECTFE) was used to prepare non-woven fabric-based porous membranes, using a polyester non woven (NWPET) as support, via dip-coating. Di-ethyl Adipate (DEA) and di-ethylene Glycol (DEG) were selected as primary and secondary diluent, respectively. SEM analyses showed that in all cases the coating layer was homogeneous, covering all the NWPET support and leading to an interconnected sponge-like microstructure. Membrane characterization evidenced the effects of the DEG concentration, which plays the role of pore former. The effect of the immersion time was examined and studied, too. The produced membranes were fully characterized in terms of water contact angle, porosity and pore size. Direct contact membrane distillation (DCMD) experiments using water and salty solution 0.6 M (NaCl) as feed, were performed for selected supported membranes. The obtained fluxes ranged between 3 and 22 kg/m2h, depending on DEG concentration, at the same immersion time, and on the feed temperatures (40–60 °C). Rejection (R%) was comprised from 94.95 to 99.82%. In particular, the N-ECTFE 7-0-7 membrane, with the highest R%, showed a stable deionized water flux before and after the experiments, indicating its ability to recover its original performance.

中文翻译：

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用于直接接触膜蒸馏应用的基于无纺布的 ECTFE 膜的开发

摘要 在这项工作中，HALAR® 乙烯-三氟氯乙烯 (LMP ECTFE) 的较低熔点被用于制备基于无纺布的多孔膜，使用聚酯无纺布 (NWPET) 作为支撑，通过浸涂。分别选择己二酸二乙酯 (DEA) 和二乙二醇 (DEG) 作为主要和次要稀释剂。SEM 分析表明，在所有情况下，涂层都是均匀的，覆盖了所有的 NWPET 载体，并形成了相互连接的海绵状微观结构。膜表征证明了 DEG 浓度的影响，它起着成孔剂的作用。浸泡时间的影响也被检查和研究。生产的膜在水接触角、孔隙率和孔径方面得到了充分表征。直接接触膜蒸馏 (DCMD) 实验使用水和 0.6 M (NaCl) 的盐溶液作为进料，对选定的支持膜进行。获得的通量范围在 3 到 22 kg/m2h 之间，这取决于 DEG 浓度、相同的浸泡时间和进料温度（40-60 °C）。拒绝率 (R%) 为 94.95 至 99.82%。尤其是 R% 最高的 N-ECTFE 7-0-7 膜在实验前后均表现出稳定的去离子水通量，表明其能够恢复其原始性能。