Liang Yejin, Kim Soyoung, Yang Eunmok, Choi Heechul
School of Earth Science and Environmental Engineering, Gwangju Institute of Science and Technology (GIST), 123 Cheomdangwagi-ro, Buk-gu, Gwangju, 61005, South Korea.
ACS Appl Mater Interfaces. 2020 Jun 3;12(22):25324-25333. doi: 10.1021/acsami.0c05559. Epub 2020 May 19.
An excellent antifouling membrane with high permeate flux is required for oil/water emulsion separation due to ever-increasing oily industrial wastewater. Thus, an intriguing integration of the Omni-directional protected porous membrane that combines a high porosity nanofiber membrane with a surface segregation mechanism is established for the first time. By applying polydimethylsiloxane(PDMS)-terminated triblock copolymer, the enrichment of the hydrophilic poly(ethylene oxide) (PEO) segment and the nonpolar PDMS segment on the surface of the nanofiber endowed the nanofiber membrane with underwater oleophobicity and low oil adhesion force, exhibiting oil resistance as well as oil release property. An ultrahigh permeate flux of ∼7115 L m h with a separation efficiency of ∼97.88% is achieved under the driving force of gravity (∼0.9 kPa), which is the highest permeate flux ever reported under similar conditions. Moreover, the surface segregation nanofiber membrane shows excellent reusability and ultrahigh permeate flux with the assistance of stirring in a long-term test, revealing the promising performances for the further particular application of oily wastewater.
由于含油工业废水不断增加，油/水乳液分离需要一种具有高通量的优异抗污染膜。因此，首次建立了一种将高孔隙率纳米纤维膜与表面偏析机制相结合的全向保护多孔膜的有趣集成。通过应用聚二甲基硅氧烷（PDMS）封端的三嵌段共聚物，纳米纤维表面亲水性聚环氧乙烷（PEO）链段和非极性PDMS链段的富集赋予了纳米纤维膜水下疏油性和低油粘附力，表现出耐油性和油释放性能。在重力（约0.9 kPa）驱动力下，实现了约7115 L m⁻² h⁻¹的超高通量和约97.88%的分离效率，这是类似条件下报道的最高通量。此外，表面偏析纳米纤维膜在长期测试中借助搅拌显示出优异的可重复使用性和超高通量，揭示了其在含油废水进一步特殊应用中的前景性能。
