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ACS Appl Mater Interfaces. 2017 Dec 27;9(51):44687-44694. doi: 10.1021/acsami.7b10932. Epub 2017 Dec 14.

Selective Molecular Separation on Ti3C2Tx-Graphene Oxide Membranes during Pressure-Driven Filtration: Comparison with Graphene Oxide and MXenes.

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Department of Chemical and Biomolecular Engineering (BK-21 Plus) and KAIST Institute for Nanocentury, Korea Advanced Institute of Science and Technology , Daejeon 34141, Republic of Korea.
Department of Materials Science and Engineering and A. J. Drexel Nanomaterials Institute, Drexel University , 3141 Chestnut Street, Philadelphia, Pennsylvania 19104, United States.


In this work, we prepared 90 nm thick Ti3C2Tx-graphene oxide (GO) membranes laminated on a porous support by mixing GO with Ti3C2Tx. This process was chosen to prevent the penetration of target molecules through inter-edge defects or voids with poor packing. The lattice period of the prepared membrane was 14.28 Å, as being swelled with water, resulting in an effective interlayer spacing of around 5 Å, which corresponds to two layers of water molecules. The composite membranes effectively rejected dye molecules with hydrated radii above 5 Å, as well as positively charged dye molecules, during pressure-driven filtration at 5 bar. Rejection rates were 68% for methyl red, 99.5% for methylene blue, 93.5% for rose Bengal, and 100% for brilliant blue (hydrated radii of 4.87, 5.04, 5.88, and 7.98 Å, respectively). Additionally, the rejections of composite membrane were compared with GO membrane and Ti3C2Tx membrane.


MXene; graphene oxide; membrane; nanofiltration; two-dimensional materials


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