State Key Laboratory of Separation Membranes and Membrane Processes , Tianjin 300387 , China.
School of Materials Science and Engineering , Tianjin Polytechnic University , Tianjin 300387 , China.
ACS Appl Mater Interfaces. 2019 Sep 25;11(38):35479-35487. doi: 10.1021/acsami.9b12252. Epub 2019 Sep 10.
The efficient treatment of oil-water emulsions in extreme environments, such as strongly acidic and alkaline media, remains a widespread concern. Poly(phenylene sulfide) (PPS)-based porous membranes with excellent resistance to chemicals and solvents are promising for settling this challenge. However, the limited hydrophilicity and the poor hydrated ability of the hydrophilic PPS (h-PPS) membranes reported in the literature prevents them from separating oil-water emulsions with high efficiency, large fluxes, and good antifouling performances. In this study, a firm rough TiO layer is constructed on a h-PPS membrane via electrostatic assembly to improve the surface hydrophilization. The introduction of the TiO layer increases the wetting selectivity and decreases the oil adhesion, which makes it capable to efficiently treat oil-in-water emulsions (efficiency > 98%). Most importantly, the underwater critical oil intrusion pressure almost doubled after the incorporation of the TiO layer, which allows the membrane to withstand pressurized filtration, achieving a high flux of ∼4000 L m h. This is more than 2 orders of magnitude larger than the flux of the reported h-PPS. Furthermore, the TiO@h-PPS membrane displays long-term stability in separating oil-water emulsions in strong acid and strong alkali, showing a promising prospect for the treatment of strongly corrosive emulsions.
在强酸和强碱等极端环境中，高效处理油水乳液仍然是一个广泛关注的问题。具有优异耐化学性和溶剂性的基于聚（聚苯硫醚）（PPS）的多孔膜在解决这一挑战方面具有广阔的前景。然而，文献中报道的亲水性 PPS（h-PPS）膜的亲水性有限和水合能力差，阻止了其高效、高通量和良好的抗污染性能地分离油水乳液。在本研究中，通过静电组装在 h-PPS 膜上构建了坚固的粗糙 TiO 层，以提高表面亲水化程度。TiO 层的引入增加了润湿选择性并降低了油的附着性，使其能够有效地处理含油乳液（效率>98%）。最重要的是，加入 TiO 层后水下临界油渗透压力几乎增加了一倍，这使得膜能够承受加压过滤，实现约 4000 L m h 的高通量。这比报道的 h-PPS 的通量大两个数量级以上。此外，TiO@h-PPS 膜在强酸和强碱中分离油水乳液时表现出长期稳定性，为处理强腐蚀性乳液展示了广阔的前景。
