Fabrication of Long-Term Durable Superhydrophilic/Underwater Superoleophobic Oil-Water Separation Membrane with Dual Rough Structures via Laser-Induced SiO2 Deposition

With the extraction of petroleum, large volumes of oily wastewater threaten both human health and the natural environment. Through efficient oil-water separation, achieving wastewater purification has become a pressing issue. This work employs laser-induced SiO 2 deposition to fabricate a long-term durable membrane with superhydrophilicity and underwater superoleophobicity. By optimizing pulse laser parameters, this work constructed uniform ripple-like micro-nano rough structures on the substrate surface. This enhances the deposition efficiency of SiO 2 nanoparticles, forming a stable micro-nano dual-layer rough structure that enhances the wettability of the membrane. This work conducts experiments to evaluate the membrane’s practical application performance. These results demonstrated that the membrane exhibits an outstanding separation efficiency of 99.8%. Not only did it maintain a separate efficiency above 99% after 80 cycles, but it also retained a 156° underwater oil contact angle and a 3.2° oil rolling angle after 100 days of air exposure, demonstrating exceptional long-term durability. Meanwhile, the membrane exhibits superior anti-oil-fouling performance and mechanical durability, indicating significant potential for practical applications.