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Gravity-driven Hybrid Membrane for Oleophobic-Superhydrophilic Oil-Water Separation and Water Purification by Graphene

Gravity-driven Hybrid Membrane for Oleophobic-Superhydrophilic Oil-Water Separation and Water Purification by Graphene

Hyun Yoon, Seung-Heon Na, Jae-Young Choi, Sanjay S Latthe, Mark T Swihart, Salem S Al-Deyab, Sam S Yoon

Langmuir. 2014 Oct 7;30(39):11761-9.

PMID: 25192514

Abstract:

We prepared a simple, low-cost membrane suitable for gravity-driven oil-water 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-water separator. The contact angles (CAs) of hexadecane and water on the prepared composite membranes were 95 ± 2° and 0°, 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.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP26062793	Poly(diallyldimethylammonium chloride) solution		26062-79-3	Price
AP7398698	Diallyldimethylammonium chloride solution		7398-69-8	Price

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