Key Lab of Science & Technology of Eco-textile, Ministry of Education, College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, PR China.
Key Lab of Science & Technology of Eco-textile, Ministry of Education, College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, PR China; College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, PR China.
J Hazard Mater. 2021 Aug 15;416:125697. doi: 10.1016/j.jhazmat.2021.125697. Epub 2021 Mar 26.
Except the good separation performance, the membranes used for oil-water mixture separation should be fabricated with as little wastewater produced as possible. Thus, we proposed a green tactic--water vapor induced phase inversion to prepare the high-strength and superhydrophilic/underwater superoleophobic nonwoven fabric-based cotton/PA6/PAN membranes which is based on the polymer/solvent/nonsolvent ternary system analysis. Differing from adding additives in polymer solution or coagulation bath, above proposed strategy has an "subtractive effect" with the advantages of constructing three-dimensional porous structure and greatly reducing the organic wastewater produced during preparation process. Moreover, the obtained cotton/PA6/PAN membranes exhibited unexpected performances for separating oil-in-water emulsions. An ultrahigh permeation flux of up to 478,000 L m h bar with a separation efficiency of > 99.9% was obtained under the driving pressure of 1.6 KPa, which was one order of magnitude higher than the conventional separation membranes with similar properties. In addition, it is surprising that the cotton/PA6/PAN membranes can also extract water from the slick oil/water immiscible mixture. Therefore, it is expected that the cotton/PA6/PAN membranes can be used in practical oily wastewater purification.
除了良好的分离性能外，用于油水混合物分离的膜应尽可能少地产生废水。因此，我们提出了一种绿色策略——水蒸气诱导相转化法，以制备高强度、超亲水/水下超疏油的无纺纤维基棉/PA6/PAN 膜，该策略基于聚合物/溶剂/非溶剂三元体系分析。与在聚合物溶液或凝固浴中添加添加剂不同，上述策略具有“减法效应”，具有构建三维多孔结构和大大减少制备过程中产生的有机废水的优点。此外，所得到的棉/PA6/PAN 膜在分离水包油乳液方面表现出意想不到的性能。在 1.6 kPa 的驱动压力下，获得了高达 478000 L m h bar 的超高渗透通量和>99.9%的分离效率，这比具有类似性能的常规分离膜高出一个数量级。此外，令人惊讶的是，棉/PA6/PAN 膜还可以从 slick 油/水不混溶混合物中提取水。因此，预计棉/PA6/PAN 膜可用于实际含油废水的净化。
