Underwater superoleophobic PVA–GO nanofibrous membranes for emulsified oily water purification,Environmental Science: Nano

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Underwater superoleophobic PVA–GO nanofibrous membranes for emulsified oily water purification
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2019-11-08 , DOI: 10.1039/c9en00883g
Abdul Ghaffar _{1,

2,

3,

4,

5} , Cheng Chen _{1,

2,

3,

4,

5} , Xiaoying Zhu _{1,

2,

3,

4,

5} , Baoliang Chen _{1,

2,

3,

4,

5}

Affiliation

Accidental oil spills during oil exploration, production and transportation constitute a significant environmental threat, and thus remain a major challenge. Given that, common polymeric membranes often exhibit surface fouling, which limits their long term practical applications and makes it hard to recycle them with efficient flux stability and separation efficiency. Herein, we report a versatile porous structured polyvinyl alcohol (PVA) based nanofibrous membrane (NFM) with graphene oxide (GO), prepared by simple and straightforward electrospinning, to remediate oily water. The PVA–GO NFM was prepared keeping in view an effective pore geometry and selective wettability to facilitate oily water emulsion separation entirely under gravitational force, with a controlled GO ratio and compatibility to avoid aggregation, allowing easy spin ability. The morphology of the PVA NFM was completely changed in the presence of GO due to homogenous distribution with robust mechanical strength and outstanding thermal stability. As a result, the as-prepared PVA–GO NFM achieves a separation efficiency of above 99% for surfactant-free and surfactant-stabilized oily water emulsions with a water flux of approximately 45 and 30 L m⁻² h⁻¹, entirely under gravitational force due to the presence of GO. Furthermore, the PVA–GO NFM maintains its actual selectivity and surface wettability even after recycling, thereby allowing long term applications with almost the same separation efficiency and water flux. The present methodology for membrane fabrication is believed to be an effective energy saving filtration approach, with anti-oil property and reusability, and thus is promising for practical use in water purification and treatment processes, specifically for oily water remediation.

中文翻译：

水下超疏油PVA-GO纳米纤维膜，用于乳化油性水的净化

石油勘探，生产和运输过程中意外漏油构成了重大的环境威胁，因此仍然是主要挑战。鉴于此，普通的聚合物膜经常表现出表面结垢，这限制了它们的长期实际应用，并使其难以以有效的通量稳定性和分离效率进行再循环。在这里，我们报告了一种通用的多孔结构聚乙烯醇（PVA）为基础的纳米纤维膜（NFM）和氧化石墨烯（GO），通过简单而直接的静电纺丝法制备，以修复油性水。制备PVA-GO NFM时要考虑有效的孔几何形状和选择性润湿性，以完全在重力作用下促进油性水乳液的分离，并控制GO的比例和相容性以避免聚集，从而易于旋转。由于GO的存在，PVA NFM的形态发生了完全改变，这是由于其均一的分布，强大的机械强度和出色的热稳定性。结果，制备的PVA-GO NFM对水流量约为45和30 L m的不含表面活性剂和表面活性剂稳定的油性水乳液的分离效率可达到99％以上^-2 h^-1，由于GO的存在，完全在重力的作用下。此外，即使回收后，PVA-GO NFM仍能保持其实际的选择性和表面润湿性，从而可以以几乎相同的分离效率和水通量进行长期应用。据信，目前用于膜制造的方法学是一种有效的节能过滤方法，具有抗油性和可重复使用性，因此有望在水净化和处理过程中实际使用，特别是在油性水修复中。

更新日期：2019-11-08

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