Journal Article

Subnanoporous hydrophobic thin films for ultrahigh-efficiency seawater and brines desalination using membrane distillation

Matsuura, Takeshi, Eddaoudi, Mohamed, Maurin, Guillaume, Obaid, M., Guillerm, Vincent, Ayach, Maya, Ghaffour, Noreddine, Singaravelu, Venkatesh, Mohamed, Hend Omar, Qtaishat, Mohammed Rasool, Zhang, Yaping, Soukane, Sofiane, Castaño, Pedro

2026

Overview

Fabricating breakthrough materials capable of desalinating seawater and brine with high selectivity and low energy consumption is crucial for addressing global water and energy challenges. We report here the desalination capability of ultra-thin polymeric films with subnanometer pores synthesized through the polymerization of fluorinated trichlorosilane monomers and diamine-based monomers. The combination of subnanometer pore size, submicron thickness, and superhydrophobicity facilitates efficient liquid-to-vapor phase change in the membrane distillation process, enabling effective desalination performance. The thin-films demonstrate high salt rejection (99.8%), complete boron rejection, and water fluxes of 40 L.m −2 .h −1 (1.88 kWh.m −3 , WRR sp 0.32%) and 238 L.m −2 .h −1 (20.65 kWh.m −3 , WRR sp 3.87%) for seawater at 25 °C and 60 °C, respectively. For the desalination of real seawater reverse osmosis brine at 25 °C, the thin-films maintain 12 L.m −2 .h −1 (4.4 kWh.m −3 , WRR sp 0.09%) under comparable conditions. Their polymeric nature, chlorine resistance, and low energy requirements, indicate a potential for scalable and sustainable desalination systems. Fabricating breakthrough materials capable of desalinating seawater and brine with high selectivity and low energy consumption is vital to address the global water shortage and energy crisis. Here the authors describe the synthesis of thin films with submicron thicknesses and subnanometer pores with outstanding desalination performance.

• Publisher: Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
• Subject: 147/135 / 147/3 / 639/166/898 / 639/301/357/551 / 639/638/298/923/1028 / Boron / Brines / Chemical Sciences / Chlorine / Crude oil / Desalination / Diamines / Distillation / Energy consumption / Energy requirements / Humanities and Social Sciences / Hydrophobic surfaces / Hydrophobicity / Membranes / Monomers / Morphology / multidisciplinary / Polymer films / Polymerization / Pore size / Porous materials / Rejection / Reverse osmosis / Salt rejection / Scanning electron microscopy / Science / Science (multidisciplinary) / Seawater / Silicon wafers / Thickness / Thin films / Vapor phases / Water shortages