Wang Kai, He Huaqiang, Zhang Tian C, Liang Ying, Yuan Shaojun
College of Architecture and Environmental Engineering, Sichuan University, Chengdu 610065, P. R. China.
Low-carbon Technology & Chemical Reaction Engineering Lab, College of Chemical Engineering, Sichuan University, Chengdu 610065, P. R. China.
ACS Appl Mater Interfaces. 2021 Feb 10;13(5):6906-6918. doi: 10.1021/acsami.0c21783. Epub 2021 Feb 1.
A feasible and efficient membrane for long-term treatment of complex oily wastewater is especially in demand, but its development still remains a challenge because of serious membrane fouling and incomplete/destructive reclamation methods. Herein, an interpenetrating TiO nanorod-decorated membrane with self-locked and self-cleaning properties is rationally fabricated coaxial electrospinning and hydrothermal synthesis. The self-locked membrane shows full reinstatement of the original state and exhibits satisfactory mechanical strength, superhydrophilicity, underwater superoleophobicity, and robust solvent resistance, which endow the membrane with successful separation for 16 types of highly emulsified oil-in-water emulsions (, surfactant-free; anionic, cationic, and nonionic surfactant-stabilized). Moreover, successful sequencing treatment of soluble organic emulsions using the separated "bait-hook-destroy" strategy indicates that the pristine membrane can be used to treat multipollutant wastewater with various limits. Most importantly, the fouled membrane can easily be reinstated by light irradiation without reduction of both mechanical strength and separation performance. As a proof of concept, the as-synthesized membrane shows an ultrahigh flux over 5000 L m h with a removal efficiency of >99.92%. The present development would provide a highly efficient strategy for the fabrication of an inorganic-organic revivable electrospinning membrane for various applications.
一种用于长期处理复杂含油废水的可行且高效的膜尤其急需，但由于严重的膜污染以及不完整/破坏性的再生方法，其开发仍然是一项挑战。在此，通过同轴静电纺丝和水热合成合理制备了一种具有自锁和自清洁特性的互穿型TiO纳米棒修饰膜。这种自锁膜能完全恢复到原始状态，表现出令人满意的机械强度、超亲水性、水下超疏油性和强大的耐溶剂性，这些特性使该膜能够成功分离16种高度乳化的水包油乳液（无表面活性剂；阴离子、阳离子和非离子表面活性剂稳定型）。此外，使用分离的“诱饵-钩子-破坏”策略对可溶性有机乳液进行成功的顺序处理表明，原始膜可用于处理具有各种限制的多污染物废水。最重要的是，被污染的膜可以通过光照射轻松恢复，而不会降低机械强度和分离性能。作为概念验证，合成的膜显示出超过5000 L m⁻² h⁻¹的超高通量，去除效率>99.92%。目前的进展将为制造用于各种应用的无机-有机可恢复静电纺丝膜提供一种高效策略。
