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Integrated α-MnO 2 nanowires PVDF catalytic membranes for efficient purification of dye wastewater with high permeability

Journal of Water Process Engineering, ISSN: 2214-7144, Vol: 56, Page: 104315
2023
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Catalytic membranes have been studied and reported widely, but ideal catalytic membranes with high rejection ratio and high permeability simultaneously are still a challenge to develop. Herein, integrated α-MnO 2 nanowires polyvinylidene fluoride (PVDF) catalytic membranes were fabricated by a vacuum filtration method. Based on the intercalation structures of GO formed by α-MnO 2 nanowires and the spatial stacking of nanowires, filter channels with high water flux were constructed. While CS displayed as anchor point to fix α-MnO 2 nanowires and also endow the membrane surface with electro-positivity. Then, a sequence of catalytic membranes with different content of α-MnO 2 were prepared, and detailed characterizations of structure were taken out. Finally, all of the membranes displayed excellent stability in harsh conditions (pH values from 3 to 11), and M-5 with the most content of α-MnO 2 displayed the best separation ability, for which the rejection ratio reached 99.26 % along with a high permeability about 923.72 L·m −2 ·h −1 ·Bar −1, when it was used to separate methyl blue (MBE) wastewater. In addition, M-5 also displayed excellent reusability, such as the rejection ratio still maintained above 92.62 % after 9th cycles and reduced to 86.74 % after 10th cycle, while the permeability still remained 612.09 L·m −2 ·h −1 ·Bar −1 after the 10th cycle. Therefore, this work developed an outstanding catalytic membrane, which displayed good application prospect for treatment of dye wastewater.

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