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    Interlayered Forward Osmosis Membranes with Ti3C2Tx MXene and Carbon Nanotubes for Enhanced Municipal Wastewater Concentration

    Year: 2021

    Journal: Environ. Sci. Technol., Volume 55, OCT 5, page 13219–13230

    Authors: Sun, Peng-Fei; Yang, Zhe; Song, Xiaoxiao; Lee, Jeong Hoon; Tang, Chuyang Y.; Park, Hee-Deung

    Organizations: Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [2020R1A6A1A03045059]; Research Grants Council of the Hong Kong Special Administrative Region, China [GRF HKU 17204220]

    Keywords: interlayer; thin-film nanocomposite membrane (TFN); forward osmosis; Ti3C2 MXene; carbon nanotube; wastewater concentration; structural parameter; internal concentration polarization (ICP)

    Forward osmosis (FO) hybrid systems have the potential to simultaneously recover nutrients and water from wastewater. However, the lack of membranes with high permeability and selectivity has limited the development and scale-up of these hybrid systems. In this study, we fabricated a novel thin-film nanocomposite membrane featuring an interlayer of Ti3C2Tx MXene intercalated with carbon nanotubes (M/C-TFNi). Owing to the enhanced confinement effect on interfacial degassing and increased amine monomer sorption by the interlayer, the resulting M/C-TFNi FO membrane has a greater degree of crosslinking and roughness. In comparison with the thin-film composite (TFC) membrane without an interlayered structure, the M/C-TFNi membrane attained a water flux that was four times higher and a lower specific salt flux. Notably, the M/C-TFNi membrane exhibited excellent concentration efficiency for real municipal wastewater and enhanced rejection of ammonia nitrogen, which breaks the permeability-selectivity upper bound. This study provides a new avenue for the rational design and development of high-performance FO membranes for environmental applications.
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