Janus membrane with asymmetric wettability for efficient oil/water separation

Area of Science:

• Materials Science
• Environmental Engineering
• Chemical Engineering

Background:

• Societal and industrial growth, coupled with frequent oil spills, exacerbates freshwater scarcity, impacting human well-being and sustainable development.
• Advanced membrane materials with tailored wettability are crucial for effective oil/water separation technologies.

Purpose of the Study:

• To engineer a novel Janus membrane with asymmetric wettability for enhanced oil/water separation.
• To address the challenges posed by freshwater shortages due to industrial pollution and oil spills.

Main Methods:

• Hydrophobic polyethylene terephthalate (PET) fabric was modified to exhibit superhydrophilic properties via an impregnation method.
• Hydrophobic polyvinylidene fluoride (PVDF) fibers were electrospun onto the superhydrophilic fabric surface.
• The resulting PVDF/Ca10(PO4)6(OH)2@PET Janus membrane was characterized for its performance in oil/water separation.

Main Results:

• The fabricated Janus membrane demonstrated excellent unidirectional liquid transport capabilities.
• Effective separation of both heavy and light oils was achieved, with separation efficiencies exceeding 90%.
• The membrane exhibited robust performance under alkaline conditions, along with satisfactory tensile strength and reusability.

Conclusions:

• The developed Janus membrane offers a promising new approach for oil/water separation.
• This research provides innovative strategies for Janus membrane design, enhancing their application potential in addressing water resource challenges.