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Biomimetic and Superwettable Nanofibrous Skins for Highly Efficient Separation of Oil‐in‐Water Emulsions
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2018-01-08 , DOI: 10.1002/adfm.201705051 Jianlong Ge 1 , Dingding Zong 2 , Qing Jin 2 , Jianyong Yu 3 , Bin Ding 1, 3
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2018-01-08 , DOI: 10.1002/adfm.201705051 Jianlong Ge 1 , Dingding Zong 2 , Qing Jin 2 , Jianyong Yu 3 , Bin Ding 1, 3
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Developing a feasible and efficient separation membrane for the purification of highly emulsified oily wastewater is of significance but challenging due to the critical limitations of low flux and serious membrane fouling. Herein, a biomimetic and superwettable nanofibrous skin on an electrospun fibrous membrane via a facile strategy of synchronous electrospraying and electrospinning is created. The obtained nanofibrous skin possesses a lotus‐leaf‐like micro/nanostructured surface with intriguing superhydrophilicity and underwater superoleophobicity, which are due to the synergistic effect of the hierarchical roughness and hydrophilic polymeric matrix. The ultrathin, high porosity, sub‐micrometer porous skin layer results in the composite nanofibrous membranes exhibiting superior performances for separating both highly emulsified surfactant‐free and surfactant‐stabilized oil‐in‐water emulsions. An ultrahigh permeation flux of up to 5152 L m−2 h−1 with a separation efficiency of >99.93% is obtained solely under the driving of gravity (≈1 kPa), which was one order of magnitude higher than that of conventional filtration membranes with similar separation properties, showing significant applicability for energy‐saving filtration. Moreover, with the advantage of an excellent antioil fouling property, the membrane exhibits robust reusability for long‐term separation, which is promising for large‐scale oily wastewater remediation.
中文翻译：
仿生和超湿性纳米纤维皮肤，可高效分离水包油型乳液
开发用于纯化高度乳化的含油废水的可行且有效的分离膜具有重要意义，但由于通量低和严重的膜污染的严格限制，具有挑战性。在此，通过同步电喷雾和电纺丝的简便策略，在电纺纤维膜上产生了仿生且可超湿的纳米纤维皮肤。所获得的纳米纤维皮肤具有荷叶般的微/纳米结构表面，并具有迷人的超亲水性和水下超疏油性，这归因于分层粗糙度和亲水性聚合物基体的协同效应。超薄，高孔隙率，亚微米多孔表皮层使得复合纳米纤维膜在分离高度乳化的无表面活性剂和表面活性剂稳定的水包油乳剂方面表现出卓越的性能。高达5152 L m的超高通量仅在重力（≈1kPa）的驱动下才能获得−2 h -1，其分离效率> 99.93％，这比具有类似分离特性的传统滤膜要高一个数量级，显示出对能量的显着适用性节省过滤。此外，该膜还具有出色的抗积垢性能，可长期分离，具有很强的可重复使用性，有望大规模修复含油废水。
更新日期：2018-01-08
中文翻译：
仿生和超湿性纳米纤维皮肤，可高效分离水包油型乳液
开发用于纯化高度乳化的含油废水的可行且有效的分离膜具有重要意义，但由于通量低和严重的膜污染的严格限制，具有挑战性。在此，通过同步电喷雾和电纺丝的简便策略，在电纺纤维膜上产生了仿生且可超湿的纳米纤维皮肤。所获得的纳米纤维皮肤具有荷叶般的微/纳米结构表面，并具有迷人的超亲水性和水下超疏油性，这归因于分层粗糙度和亲水性聚合物基体的协同效应。超薄，高孔隙率，亚微米多孔表皮层使得复合纳米纤维膜在分离高度乳化的无表面活性剂和表面活性剂稳定的水包油乳剂方面表现出卓越的性能。高达5152 L m的超高通量仅在重力（≈1kPa）的驱动下才能获得−2 h -1，其分离效率> 99.93％，这比具有类似分离特性的传统滤膜要高一个数量级，显示出对能量的显着适用性节省过滤。此外，该膜还具有出色的抗积垢性能，可长期分离，具有很强的可重复使用性，有望大规模修复含油废水。
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