Flame-retardant GO@SiO2 modified oil-water separation membranes with superhydrophilic and underwater superoleophobic properties

Abstract

The application of oil-water separation membranes is hindered by their poor thermal stability, limited permeability, and complex production processes. To overcome these limitations, this study developed a novel modified membrane by depositing GO@SiO₂ onto nylon microporous membranes using a facile one-step vacuum filtration method. The prepared membrane exhibited both superhydrophilicity and underwater superoleophobicity. Experimental results demonstrated that the membrane achieved high separation efficiency (> 99%), exceptional water flux (3015.8 L∙m^− 2∙h^− 1), and excellent antifouling properties (Oil Contact Angle _max= 152°, low oil adhesion) for water-in-oil emulsions. Moreover, the membrane exhibited outstanding flame retardancy (LOI_max=29%) and superior thermal stability. It showed higher thermal decomposition temperatures and significantly slower weight loss rates. This modified GO@SiO₂ membrane showed great potential for the industrial-scale treatment of oil-in-water emulsions. Importantly, the flame-retardant properties also made the membrane a promising candidate for offshore oil spill fire remediation.