Wang Kai, He Huaqiang, Wei Baibing, Zhang Tian C, Chang Haiqing, Li Yingqi, Tian Xiaobao, Fan Yubo, Liang Ying, Yuan Shaojun
MOE Key Laboratory of Deep Earth Science and Engineering, College of Architecture and Environmental Engineering, Sichuan University, Chengdu, 610065, P. R. China.
Beijing Advanced Innovation Center for Biomedical Engineering, Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing 100191, China.
ACS Appl Mater Interfaces. 2021 Nov 17;13(45):54315-54323. doi: 10.1021/acsami.1c15024. Epub 2021 Nov 4.
Surfaces with unusual under-liquid dual superlyophobicity are attractive on account of their widespread applications, but their development remains difficult due to thermodynamic contradiction. Additionally, these surfaces may suffer from limited antifouling ability, which has restricted their practical applications. Herein, we report a successful in situ growth of a hybrid zeolitic imidazolate framework-8 and zinc oxide nanorod on a porous poly(vinylidene fluoride) membrane (ZIF-8@ZnO-PPVDF) and its application as a self-cleaning switchable barrier material in rapid filtration for emulsified oily wastewater. The novel ZIF-8@ZnO-PPVDF exhibits superior mechanical strength, reversible under-liquid dual superlyophobicity, photocatalytic self-cleaning property, and an effective alternate separation capacity toward both oil-in-water (O/W) and water-in-oil (W/O) emulsions with ultrahigh fluxes and efficiencies (>99%). By simply using a "bait-hook-eliminate" method to separate the O/W emulsions containing soluble organic pollutants, we demonstrate that the ZIF-8@ZnO-PPVDF can achieve stable separation fluxes over 600 L m h with high efficiencies and be completely/nondestructively regenerated by visible-light irradiation after each cycle. This study would demonstrate a new approach to prepare an under-liquid dual superlyophobic revivable membrane for various applications.
具有异常水下双超疏性的表面因其广泛的应用而备受关注，但其发展因热力学矛盾而仍然困难。此外，这些表面可能存在抗污能力有限的问题，这限制了它们的实际应用。在此，我们报道了在多孔聚偏氟乙烯膜（ZIF-8@ZnO-PPVDF）上成功原位生长杂化沸石咪唑酯骨架-8和氧化锌纳米棒，并将其用作自清洁可切换屏障材料用于乳化含油废水的快速过滤。新型ZIF-8@ZnO-PPVDF表现出优异的机械强度、可逆的水下双超疏性、光催化自清洁性能以及对水包油（O/W）和油包水（W/O）乳液的有效交替分离能力，通量和效率超高（>99%）。通过简单地使用“诱饵-钩子-消除”方法分离含有可溶性有机污染物的O/W乳液，我们证明ZIF-8@ZnO-PPVDF可以实现超过600 L m⁻² h⁻¹的稳定分离通量，效率高，并且在每个循环后通过可见光照射可完全/无损再生。这项研究将展示一种制备用于各种应用的水下双超疏性可再生膜的新方法。
