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    The underlying mechanism insights into support polydopamine decoration toward ultrathin polyamide membranes for high-performance reverse osmosis

    Journal: J. Membr. Sci., Volume 646, MAR 15

    Authors: Shen, Qin; Lin, Yuqing; Ueda, Takafumi; Zhang, Pengfei; Jia, Yuandong; Istirokhatun, Titik; Song, Qiangqiang; Guan, Kecheng; Yoshioka, Tomohisa; Matsuyama, Hideto

    Organizations: China Scholarship Council (CSC) of the Ministry of Education, CSC [201907040080]

    Keywords: Polydopamine modification; Diffusion-reaction process; Interfacial polymerization; Thin-film composite membrane; Reverse osmosis

    The development of ultrathin polyamide (PA) nanofilms with desirable water permeance and high selectivity has been recognized as crucial for energy-efficient desalination of salty water and wastewater reclamation. In this study, an ultrathin PA reverse osmosis membrane (25 nm) was fabricated via polydopamine (PDA) interlayermediated interfacial polymerization onto a polyethersulfone (PES) substrate. The ultrathin PDA interlayer was soldered in situ onto PES substrates by precisely controlling the ammonia-initiated self-assembly process. Furthermore, the PDA interlayer conferred a high-density uptake toward aqueous amine monomers and served as a quasi-molecular-scale regulator that mediated their diffusion into the organic phase to polymerize with the acyl chloride of 1, 3, 5-benzenetricarbonyl trichloride (TMC). The synergistic effects triggered self-sealing and inhibited membrane growth, promoting the formation of an ultrathin and defect-free PA nanofilm with a hierarchical nanostripe surface. The newly developed membranes exhibited a desirable water permeance of up to 1.44 L m(-2) h(-1).bar(-1), almost triple that of the pristine PA membrane (0.44 L m(-2) h(-1).bar(-1)), and a simultaneously enhanced rejection ratio of 99.2% toward NaCl. This work sheds light on strategies to develop ultrathin PA-based membranes with high water permselectivity for environmental-and energy-relevant applications.
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