Self-cleaning catalytic membrane with super-wetting interface for high-efficiency oil-in-water emulsion separation

Separation membranes with super-wetting interface can mitigate adhesion between oil and membrane, but fouling still persists and will reduce process efficiency. Here, super-wetting membranes with catalytic perfor-mance were fabricated with Fe3O4-loaded attapulgite (FATP) nanofibers as separation layer. The FATP possesses hydrophilic and micro-nano roughness, which can form a hydration layer as a barrier to resist oil fouling. Simultaneously, the FATP serves as a catalyst for the Fenton-like reaction to remove irreversible fouling. During oil-in-water filtration, more than 99.5 % of oil droplets can be rejected, and membrane permeance maintains at 62% of its initial value. After hydraulic cleaning, the permeance recovers to 85%, while the remaining 10.9% permeance can be restored through Fenton-like reaction. In the catalytic process, oil fouling can be degraded into smaller particles and escape from membrane structure. This work prepared an anti-fouling super-wetting membrane and provided insights into the membrane's catalytic mechanism after oil fouling.

Automated summary

Super-wetting membranes with catalytic performance were fabricated using Fe3O4-loaded attapulgite (FATP) nanofibers. These membranes possess hydrophilicity and micro-nano roughness, which resist oil fouling and act as a catalyst for the Fenton-like reaction. During oil-in-water filtration, more than 99.5% of oil droplets can be rejected, and membrane permeance remains at 62% of its initial value. After hydraulic cleaning, the permeance recovers to 85%, and the remaining 10.9% can be restored through the Fenton-like reaction. This study provides insights into the catalytic mechanism of membranes after oil fouling.