2 research outputs found
Gravity-Driven Hybrid Membrane for Oleophobic–Superhydrophilic Oil–Water Separation and Water Purification by Graphene
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
polyÂ(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
Gravity-Driven Hybrid Membrane for Oleophobic–Superhydrophilic Oil–Water Separation and Water Purification by Graphene
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
polyÂ(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