Highly hydrophobic oil−water separation membrane: reutilization of waste reverse osmosis membrane

Abstract

The increasing applications of seawater desalination technology have led to the wide usage of polyamide reverse osmosis membranes, resulting in a large number of wasted reverse osmosis membranes. In this work, the base nonwoven layer of the wasted reverse osmosis membrane was successfully modified into the hydrophobic membrane via surface deposition strategy including TiO₂ and 1H,1H,2H,2H-perfluorooctyltrichlorosilane (PFOTS), respectively. Various techniques were applied to characterize the obtained membranes, which were then used to separate the oil–water system. The optimally modified membrane displayed good hydrophobicity with a contact angle of 135.2° ± 0.3°, and its oil–water separation performance was as high as 97.8%. After 20 recycle tests, the oil–water separation performance remained more than 96%, which was attributed to the film adhesion of the anchored TiO₂ and PFOTS layer on the surface. This work might provide a new avenue for recycling the wasted reverse osmosis membrane used in oily wastewater purification.

Keywords

oil–water separation / wasted reverse osmosis membrane / hydrophobic modification

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Acknowledgements

We gratefully acknowledge the financial support from the National Natural Science Foundation of China (Grant No. 21576205), the Tianjin Natural Science Foundation (Grant No. 18JCTPJC48600), and the Training Project of Innovation Team of Colleges and Universities in Tianjin (Grant No. TD13-5020).

Electronic Supplementary Material

Supplementary material is available in the online version of this article at https://dx.doi.org/10.1007/s11705-022-2200-0 and is accessible for authorized users.

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