Constructing Environmental-Friendly "Oil-Diode" Janus Membrane for Oil/Water Separation

Area of Science:

• Materials Science
• Environmental Science
• Chemical Engineering

Background:

• Oil leakage is a significant global environmental problem, leading to resource waste and ecological damage.
• Traditional "oil-diode" Janus membranes struggle with light oil recycling due to complete hydrophobicity on one side.
• Effective oil/water separation is crucial for environmental protection and resource management.

Purpose of the Study:

• To develop an improved "oil-diode" Janus membrane with a specialized wettable structure for enhanced oil refining.
• To overcome the limitations of conventional Janus membranes in handling light oils and improving recycling efficiency.
• To create a membrane capable of fast and efficient separation of water-in-oil emulsions.

Main Methods:

• Fabrication of Janus membranes with carefully controlled material characteristics and surface wettability.
• Investigation of the interplay between material properties and surface wettability for optimal performance.
• Testing the separation performance of the developed membranes using stable water-in-oil emulsions.

Main Results:

• The manufactured Janus membranes achieved an exceptionally high oil intrusion pressure of 12 kPa.
• The membranes demonstrated high permeance (2993 L m⁻² h⁻¹ bar⁻¹) in separating water-in-oil emulsions.
• Achieved a separation efficiency of up to 99.6% for stable water-in-oil emulsions.

Conclusions:

• The novel "oil-diode" Janus membranes offer a promising solution for fast oil refining and efficient oil recovery.
• The specialized wettable structure is key to preventing oil permeation and enhancing recycling.
• These membranes show significant potential for addressing oil leakage issues and improving resource utilization.