Preparation of UiO-66-NH 2 /MgAl-LDHs @ Sodium Alginate Fiber Membrane and Determination of Oil Water Separation Performance

Oil spills and waste oil discharges generate vast quantities of oily wastewater, posing severe ecological and environmental challenges while also endangering human health, which necessitates the development of advanced and efficient oil-water separation membranes. In this work, a novel sodium alginate fiber (SA) based superhydrophilic/underwater superoleophobic (SUS) membrane was developed for o/w separation through a facile method by blending SA nanofibers with UiO-66-NH ₂ /MgAl-LDH cluster-assembled microsphere. The micron-scale spheres were embedded within SA nanofibers, inducing the formation of a loosely stacked nanofiber structure, thereby enhancing water permeability. The obtained composite membrane exhibited good o/w separation performance with a high separation efficiency of >99% and a flux rate of ~2661 L m ^-2 h ^-1 . Moreover, The underwater oil contact angle (OCA) of U-LDHn@SA composite membrane were all around 140°, which indicated that U-LDHn@SA composite membrane has good underwater superoleophobicity. After 10 cycles, the oil-water separation efficiency exceeded 99% and the water flux always exceeds 2021 L m ^-2 h ^-1 . The compose membrane also exhibited the potential to separate oil-in-water emulsion with the highest oil rejection of 94%. The membrane showed antifouling properties, recyclability, and stability in harsh conditions. This work provides a new idea for the development of oil-water separation membranes with practical applications.