A Self-Standing, Support-Free Membrane for Forward Osmosis with No Internal Concentration Polarization
A Self-Standing, Support-Free Membrane for Forward Osmosis with No Internal Concentration Polarization
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一种用于正向渗透的自立式无支撑膜，无内部浓度极化
DOI：
10.1021/acs.estlett.8b00117
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发表时间：
2018-05-01
影响因子：
10.9
通讯作者：
Elimelech, Menachem
中科院分区：
文献类型：
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作者：
Li, Meng;Karanikola, Vasiliki;Elimelech, Menachem
传统的不对称或薄膜复合正向渗透膜存在严重的内部浓度极化，严重影响了工艺性能和实际应用。本文报道了羧酸衍生物聚恶二唑共聚物的合成，用于制备无支撑层的自立型选择性薄膜。膜的厚度被控制在仅仅几微米，以达到对Na2SO4拉伸溶液的高截留率，同时保持可接受的透水性。由于膜的结构是对称的，所以膜的两侧都表现出优异的相同的FO性能。由于对称FO膜内部没有浓聚极化，制备的膜的结构参数为零。我们的研究结果强调了无支撑膜在进一步发展FO技术方面的潜力。
Conventional asymmetric or thin-film composite forward osmosis (FO) membranes suffer from severe internal concentration polarization, which significantly hinders process performance and practical applications. Here we report the synthesis of the COOH-derived polyoxadiazole copolymer for the fabrication of a self-standing selective thin film without a support layer. The thickness of the membrane was controlled at merely a few micrometers to achieve a high rate of rejection of the Na2SO4 draw solution, while maintaining acceptable water permeability. Because of the symmetric architecture, the membrane exhibited excellent and identical FO performance at both of its sides. The structural parameter of the fabricated membranes was zero because of the absence of internal concentration polarization in the symmetric FO membranes. Our results highlight the potential of support-free membranes for the further development of FO technology.