Smart Fiber Membrane for pH-Induced Oil/Water Separation
Smart Fiber Membrane for pH-Induced Oil/Water Separation
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DOI：
10.1021/acsami.5b04146
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发表时间：
2015-09-09
影响因子：
9.5
通讯作者：
Luo, Zheng-Hong
中科院分区：
文献类型：
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作者：
Li, Jin-Jin;Zhou, Yin-Ning;Luo, Zheng-Hong
被石油或有机化合物污染的废水对环境和人类构成威胁。有效地分离油和水是非常需要的，但仍然具有挑战性。本文报道了用静电纺丝的方法在不锈钢网片上沉积pH响应型共聚纤维制备智能纤维膜。采用铜(0)介导的可逆失活自由基聚合法合成了高性价比的前驱体材料聚甲基丙烯酸甲酯-嵌段-聚(4-乙烯基吡啶)(PMMA-b-P4VP)。PH响应型P4VP和水下亲油/亲水PMMA使所制备的膜对水和油具有可切换的表面润湿性。纤维的三维网络结构大大增强了膜的油水润湿性能，这在分离油水混合物方面是非常理想的。所制备的纤维膜实现了重力驱动、pH可控的油水分离。油选择性地通过膜，而水保持在初始状态；在膜被酸性水(pH为3)润湿后，实现反向分离。这两种分离都是高效的，在分离过程多次循环后，膜也表现出可切换的润湿性。这种经济实惠、易于批量生产的智能纤维膜具有优异的防油污性能，在净水、采油等实际应用中具有巨大的潜力。
Wastewater contaminated with oil or organic compounds poses threats to the environment and humans. Efficient separation of oil and water are highly desired yet still challenging. This paper reports the fabrication of a smart fiber membrane by depositing pH-responsive copolymer fibers on a stainless steel mesh through electrospinning. The cost-effective precursor material poly(methyl methacrylate)-block-poly(4-vinylpyridine) (PMMA-b-P4VP) was synthesized using copper(0)-mediated reversible-deactivation radical polymerization. The pH-responsive P4VP and the underwater oleophilic/hydrophilic PMMA confer the as-prepared membrane with switchable surface wettability toward water and oil. The three-dimensional network structure of the fibers considerably strengthens the oil/water wetting property of the membrane, which is highly desirable in the separation of oil and water mixtures. The as-prepared fiber membrane accomplishes gravity-driven pH-controllable oil/water separations. Oil selectively passes through the membrane, whereas water remains at the initial state; after the membrane is wetted with acidic water (pH 3), a reverse separation is realized. Both separations are highly efficient, and the membrane also exhibits switchable wettability after numerous cycles of the separation process. This cost-effective and easily mass-produced smart fiber membrane with excellent oil-fouling repellency has significant potential in practical applications, such as water purification and oil recovery.