Abstract
Two-dimensional (2D) Ti3C2Tx MXene nanosheets have been identified as promising for constructing ultrathin laminar nanostructures with nanoscale water transport channels for water purification. Herein, ZnO@Ti3C2Tx MXene nanofiltration (NF) membranes were prepared via coupling ZnO nanoflowers to the Ti3C2Tx MXene-based laminar nanostructure, which exhibited photocatalytic self-cleaning properties driven by visible light for enhanced organic dye removal. The physicochemical properties and NF performance with and without photocatalytic treatment were systematically characterized. The prepared ZnO@Ti3C2Tx MXene NF membrane could reject 95.44% Congo red (CR) and demonstrated an excellent water permeability of 138.81 L·m−2·h−1·bar−1 (LMH/bar). In comparison to the Ti3C2Tx MXene membrane and the same amount of ZnO powders, the ZnO@Ti3C2Tx MXene membrane demonstrated higher photodegradation performance to 10 ppm MB. Impressively, the membrane showed an enhanced separation performance for 6 cycles with a RhB rejection > 88.48% and a permeability of 138.69 LMH/bar. Lastly, the synergistic photocatalytic mechanism of ZnO@Ti3C2Tx MXene composite nanostructure was investigated. Such results may offer a novel insight for the fabrication of laminar structured Ti3C2Tx MXene-based NF membranes with photocatalytic induced anti-fouling performance for enhanced dye water purification.
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