School of Earth Science and Environmental Engineering, Gwangju Institute of Science and Technology (GIST), 123 Cheomdangwagi-ro, Buk-gu, Gwangju, 61005, South Korea.
School of Earth Science and Environmental Engineering, Gwangju Institute of Science and Technology (GIST), 123 Cheomdangwagi-ro, Buk-gu, Gwangju, 61005, South Korea.
Chemosphere. 2019 Apr;221:479-485. doi: 10.1016/j.chemosphere.2019.01.048. Epub 2019 Jan 10.
Janus electrospun nanofiber membranes (J-ENMs) have attracted considerable interest as membranes for oil-in-water emulsion separation due to the opposite properties on each side of the membrane. Such properties can provide capillary effect and achieve water unidirectional transportation. However, the capillary effect on performances of the J-ENMs is still obscure. Therefore, it is highly important to investigate the relation of pore size, capillary pressure, and fluid flux of them. For this study, J-ENMs, which have a dual-layer structure with hydrophilic polyacrylonitrile (PAN) and hydrophobic polystyrene (PS) nanofibrous membranes simultaneously, were fabricated via the electrospinning process. Among the fabricated membranes, the large pore sizes of the PS layer of J-ENMs affected capillary pressure leading to a pure water flux increase of nine times that of the small pore size. For emulsion flux, oil droplets can pass through a large pore of the PS layer easily and can cause a decrease in emulsion flux. Nevertheless, the emulsion flux of J-ENMs was 1.7 times higher than that of single layer membrane, which showed a promising application for the oil/water separation field.
Janus 静电纺丝纳米纤维膜（J-ENMs）因其膜两侧的相反性质而在油水乳液分离膜中引起了相当大的关注。这些特性可以提供毛细效应，实现水的单向传输。然而，J-ENMs 上的毛细效应对其性能的影响仍不清楚。因此，研究它们的孔径、毛细压力和流体通量之间的关系非常重要。在这项研究中，通过静电纺丝工艺制备了具有亲水性聚丙烯腈（PAN）和疏水性聚苯乙烯（PS）纳米纤维双层结构的 J-ENMs。在所制备的膜中，J-ENMs 的 PS 层的大孔径影响毛细压力，导致纯水通量增加了九倍。对于乳液通量，油滴可以很容易地通过 PS 层的大孔，并导致乳液通量下降。然而，J-ENMs 的乳液通量比单层膜高 1.7 倍，这表明其在油水分离领域有很好的应用前景。
