Thin-film composite membranes with modified polyvinylidene fluoride substrate for ethanol dehydration via pervaporation
Thin-film composite membranes with modified polyvinylidene fluoride substrate for ethanol dehydration via pervaporation
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改性聚偏二氟乙烯薄膜复合膜用于乙醇渗透汽化脱水
DOI：
10.1016/j.ces.2014.07.040
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发表时间：
2014-10
影响因子：
4.7
通讯作者：
Yan Wang
中科院分区：
文献类型：
--
作者：
Yu Zhang;Ngoc Lieu Le;Tai-Shung Chung;Yan Wang
首次采用聚偏二氟乙烯（PVDF）稳定性高、易于加工的基材材料制备用于乙醇脱水的薄膜复合（TFC）中空纤维膜。在界面聚合之前，通过碱处理对 PVDF 基材进行表面改性，以克服其疏水性。各种表征表明，适当的碱处理可以通过引入含氧官能团有效增强表面亲水性。研究了PVDF基材的不同结构，发现最合适的形态是具有更多孔内层和相对致密外表面的双层中空纤维。还应用硅橡胶涂层来增强膜的选择性。最高的分离性能显示分离因子为 40，通量为 1288 g/m2h，且具有较高的长期稳定性。这项研究可能为探索 TFC 膜的新型基材材料提供重要见解。
For the first time, polyvinylidene fluoride (PVDF), because of its high stabilities and easy processability, was employed as the substrate material to fabricate the thin-film composite (TFC) hollow fiber membrane for ethanol dehydration. A surface modification of the PVDF substrate through an alkaline treatment was carried out before interfacial polymerization to conquer its hydrophobic nature. Various characterizations showed that a proper alkaline treatment can effectively enhance the surface hydrophilicity by introducing oxygen-containing functional groups. Different configurations of PVDF substrates were investigated and the most suitable morphology was found to be the dual-layer hollow fiber with more porous inner layer and relative denser outer surface. Silicone rubber coating was also applied to enhance the membrane selectivity. The highest separation performance showed a separation factor of 40 and a flux of 1288 g/m2h with high long term stabilities. This study may provide important insights in exploring new substrate materials for TFC membranes.
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