Solar desalination has emerged as a promising solution, using sunlight to convert seawater into freshwater with relatively low energy requirements. Seawater near ports, shipping routes, and industrial areas is often contaminated with oil, which can clog desalination membranes and reduce their performance. The hydrophobic side absorbs sunlight, converts it into heat, and drives water evaporation at the membrane surface. Testing showed that the membrane removed more than 99.99% of oil from contaminated seawater while maintaining stable performance across different oil droplet sizes and repeated cycles. The researchers suggest that the membrane developed in this study represents a broader strategy for designing next-generation water treatment technologies.