Selective Molecular Separation on Ti3C2Tx-Graphene Oxide Membranes during Pressure-Driven Filtration: Comparison with Graphene Oxide and MXenes
- Selective Molecular Separation on Ti3C2Tx-Graphene Oxide Membranes during Pressure-Driven Filtration: Comparison with Graphene Oxide and MXenes
- 김선준; 강경민; 김대우; Chang E. Ren; 조경민; 최정훈; 남윤태; Yury Gogotsi; 정희태
- nanofiltration; MXene; graphene oxide; membrane; two-dimensional materials
- Issue Date
- ACS Applied Materials & Interfaces
- VOL 9, NO 51-44694
- 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.
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