PDMS/PVDF hybrid electrospun membrane with superhydrophobic property and drop impact dynamics for dyeing wastewater treatment using membrane distillation
PDMS/PVDF hybrid electrospun membrane with superhydrophobic property and drop impact dynamics for dyeing wastewater treatment using membrane distillation
复制标题
DOI：
10.1016/j.memsci.2016.10.028
复制
发表时间：
2017-03-01
影响因子：
9.5
通讯作者：
Leiknes, TorOve
中科院分区：
文献类型：
--
作者：
An, Alicia Kyoungjin;Guo, Jiaxin;Leiknes, TorOve
膜蒸馏过程中的污染会导致运行成本的增加和水质的恶化。本工作通过静电纺丝将具有超疏水性的聚二甲基硅氧烷(PDMS)聚合物微球杂化到聚偏氟乙烯-六氟丙烯(PVDF-HFP)电纺(E-PH)膜上，制备了聚偏氟乙烯-六氟丙烯(PVDF-HFP)电纺膜。与E-PH膜形成的杂化聚二甲基硅氧烷(E-PDMS)在表面疏水性(接触角，CA=155.4度)和粗糙度(R-a=1285 nm)方面有显著提高。E-PDMS膜表面的Zeta电位比商品聚偏氟乙烯(C-PVDF)膜表面的Zeta电位负值高。E-PDMS膜的这些特性为处理不同电荷的染料提供了一种防污染，并在膜表面而不是在膜孔中产生了片状染料(松散结合的污物)结构。这也使得EPDMS膜的产率高(34 L m(-2)h(-1)，比C-PVDF膜高50%)，没有污染和润湿。此外，在长期的运行中，实现了完全脱色和纯水生产。间歇水冲洗(WF)在直接接触MD(DCMD)操作中的应用使E-PDMS膜的CA回收率达到99%，表明该方法具有可持续性。因此，E-PDMS膜在分子筛法处理印染废水中具有很好的应用前景。
Fouling in membrane distillation (MD) results in an increase in operation costs and deterioration in a water quality. In this work, a poly(vinylidene fluoride-co-hexafluoropropene) (PVDF-HFP) electrospun (E-PH) membrane was fabricated by hybridizing polydimethylsiloxane (PDMS) polymeric microspheres with super hydrophobicity onto the E-PH membrane via electrospinning. The resulting hybrid PDMS with E-PH (E-PDMS) membrane showed a significant enhancement in surface hydrophobicity (contact angle, CA=155.4 degrees) and roughness (R-a=1285 nm). The zeta potential of E-PDMS membrane surface showed a higher negative value than that of a commercial PVDF (C-PVDF) membrane. These properties of E-PDMS membrane provided an antifouling in treating of differently-charged dyes and generated a flake-like dye dye (loosely bound foulant) structure on the membrane surface rather than in the membrane pores. This also led to a high productivity of EPDMS membrane (34 L m(-2) h(-1), 50% higher than that of C-PVDF membrane) without fouling or wetting. In addition, complete color removal and pure water production were achieved during a long-term operation. An application of intermittent water flushing (WF) in direct contact MD (DCMD) operation led to a 99% CA recovery of E-PDMS membrane indicating its sustainability. Therefore, the E-PDMS membrane is a promising candidate for MD application in dyeing wastewater treatment.