Gravity-Driven Hybrid Membrane for Oleophobic鈥揝uperhydrophilic Oil鈥揥ater Separation and Water Purification by Graphene

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• 作者：Hyun Yoon ; Seung-Heon Na ; Jae-Young Choi ; Sanjay S. Latthe ; Mark T. Swihart ; Salem S. Al-Deyab ; Sam S. Yoon
• 刊名：Langmuir
• 出版年：2014
• 出版时间：October 7, 2014
• 年：2014
• 卷：30
• 期：39
• 页码：11761-11769
• 全文大小：557K
• ISSN：1520-5827

文摘

We prepared a simple, low-cost membrane suitable for gravity-driven oil鈥搘ater separation and water purification. Composite membranes with selective wettability were fabricated from a mixture of aqueous poly(diallyldimethylammonium chloride) solution, sodium perfluorooctanoate, and silica nanoparticles. Simply dip-coating a stainless steel mesh using this mixture produced the oil鈥搘ater separator. The contact angles (CAs) of hexadecane and water on the prepared composite membranes were 95 卤 2掳 and 0掳, respectively, showing the oleophobicity and superhydrophilicity of the membrane. In addition, a graphene plug was stacked below the membrane to remove water-soluble organics by adsorption. As a result, this multifunctional device not only separates hexadecane from water, but also purifies water by the permeation of the separated water through the graphene plug. Here, methylene blue (MB) was removed as a demonstration. Membranes were characterized by high-resolution scanning electron microscopy (HRSEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared (FT-IR) spectroscopy to elucidate the origin of their selective wettability.