Preparation of Polysilsesquioxane-Based RO Membranes with Urea Units for Water Desalination

W4415351467 · 수집 2026-10-04 18:16:49

T10197 Fuel Cells and Related Materials

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Seawater and brackish water desalination using membranes is anticipated to offer a simple and effective solution to the global water shortage, and polysilsesquioxane (PSQ) is expected to be the base material for robust reverse osmosis (RO) membranes for water desalination. Hydroxyethylurea-containing PSQ-based RO membranes for water desalination have recently been developed via a sol-gel process. Although these membranes showed high performance, achieving a water permeability of 1.86 × 10-12 m3 m-2s-1Pa-1 and an NaCl rejection of 95.9%, the membranes showed limited chlorine resistance and processibility and moderate heat resistance. In this study, three new urea-containing monomers were designed and prepared for RO membrane preparation. The copolymerization of these urea-containing monomer with bis(triethoxysilylpropyl)amine resulted in performance comparable to that of hydroxyethylurea-containing PSQ membranes. The present urea-containing PSQ membranes exhibited enhanced chlorine resistance, with only 1-3% decreases in NaCl rejection, even after 10,000 ppm h exposure to chlorine, together with 3-19% increases in water permeability. Additionally, the presently prepared urea-containing PSQ membranes exhibited improved processability. This study provides a new molecular design for robust and high-performance RO membranes that can be prepared through a simple sol-gel process.

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