Jin Yuting, Huang Longwei, Zheng Ke, Zhou Shaoqi
School of Environment and Energy, Guangzhou Higher Education Mega Center, South China University of Technology, Guangzhou 510006, PR China.
The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou Higher Education Mega Centre, South China University of Technology, Guangzhou 510006, PR China.
Langmuir. 2022 Jul 12;38(27):8241-8251. doi: 10.1021/acs.langmuir.2c00640. Epub 2022 Jun 30.
The scarcity of water resources has led to widespread interest in the treatment of oily wastewater. This study prepared a novel superhydrophilic/underwater superoleophobic polysulfonamide (PSA)/polyvinylpyrrolidone (PVP) nanofibrous membrane through electrostatic spinning for efficient oil-water emulsion separation. The surface morphology, fiber diameter distribution, wettability properties, and oil-water emulsion separation performance of the membranes were investigated. Results showed that the addition of PVP increases the diameter of the fibers, which led to a loose, large, porous structure and improved the permeability of the membranes. A high pure-water flux of 2057 L·m·h was obtained for membranes with PVP addition of 3 wt%, providing an 835% increase in pure-water flux compared with a pure PSA nanofibrous membrane (220 L·m·h). For -hexane-in-water emulsions, the optimum membrane obtained a high separation efficiency of 99.7%, in which flux was 1.5 times greater than that of the pure PSA nanofibrous membrane. Moreover, the optimum membrane exhibited good recycling stability and solvent resistance. The as-prepared PSA/PVP nanofibrous membrane displayed high permeability, an outstanding rejection rate, resistance to organic solvents, and reusability for oil-water separation, providing great potential in practical membrane separation applications.
水资源的匮乏引发了人们对含油废水处理的广泛关注。本研究通过静电纺丝制备了一种新型的超亲水/水下超疏油聚磺酰胺（PSA）/聚乙烯吡咯烷酮（PVP）纳米纤维膜，用于高效油水乳液分离。研究了该膜的表面形貌、纤维直径分布、润湿性以及油水乳液分离性能。结果表明，PVP的加入增加了纤维直径，形成了疏松、粗大、多孔的结构，提高了膜的渗透性。添加3 wt% PVP的膜获得了2057 L·m⁻²·h⁻¹的高纯水通量，与纯PSA纳米纤维膜（220 L·m⁻²·h⁻¹）相比，纯水通量提高了835%。对于水包正己烷乳液，最佳膜的分离效率高达99.7%，通量是纯PSA纳米纤维膜的1.5倍。此外，最佳膜表现出良好的循环稳定性和耐溶剂性。所制备的PSA/PVP纳米纤维膜具有高渗透性、出色的截留率、耐有机溶剂性以及油水分离的可重复使用性，在实际膜分离应用中具有巨大潜力。
