A windable and stretchable three-dimensional all-inorganic membrane for efficient oil/water separation

Area of Science:

• Materials Science
• Environmental Engineering
• Nanotechnology

Background:

• Developing flexible and durable membranes is crucial for advanced water treatment applications.
• Existing oil/water separating membranes often lack the required mechanical properties for practical use.
• There is a need for robust, high-performance membranes that can withstand demanding conditions.

Purpose of the Study:

• To engineer a windable and stretchable membrane for efficient oil/water separation.
• To investigate the performance of a novel three-dimensional membrane structure.
• To demonstrate the antifouling capabilities and separation efficiency of the proposed membrane.

Main Methods:

• Fabrication of a membrane using ZnO nanorods conformally grown on woven carbon microfibers.
• Characterization of the membrane's structural, mechanical (windable, stretchable), and surface properties (hydrophilicity, oleophobicity).
• Testing the membrane's performance in separating oil/saline-water mixtures and oil-in-water emulsions under gravity.

Main Results:

• The fabricated membrane exhibited excellent windable and stretchable properties due to its 3D architecture.
• The ZnO nanorods provided superior hydrophilicity and oleophobicity, leading to outstanding antifouling performance.
• The membrane achieved high separation efficiency (>99%) and an extremely high permeation flux (20933.4 L m⁻² h⁻¹).
• Simple physical cleaning effectively removed foulants from the membrane surface.

Conclusions:

• The developed all-inorganic membrane offers a promising solution for practical oil/water separation.
• Its unique 3D structure and material properties enable high performance and durability.
• This technology has significant potential for environmental remediation and water treatment applications.