Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 275, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.seppur.2021.119135
Keywords
MXene nanosheets; O-MWCNT; Hydrophilicity; Complex oily wastewater; Chemical stability
Categories
Funding
- National Key R&D Program of China [2018YFC1903205]
- Ministry of Science and Technology
- Bureau of Frontier Sciences and Education [QYZDB-SSWDQC044]
- Bureau of International Cooperation [132C35KYSB20160018]
- Chinese Academy of Sciences
- CAS-CSIRO [132C35KYSB20170051]
- Chinese Academy of Sciences-The World Academy of Sciences (CAS-TWAS) President's Fellowship
- Oxiamembrane Co., Ltd.
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In conclusion, this study introduced a game-changing approach by modifying a polyacrylonitrile (PAN) UF membrane with a 3D nanostructured composite, which successfully improved the treatment performance of complex oily wastewater. The composite membrane exhibited high separation performance of soluble dye-oil-water emulsion and excellent antifouling and anti-swelling properties, due to the synergetic effects conferred by the 3D nanostructures.
Despite advances in membrane technology, the separation of complex oily wastewater using membrane filtration remains a daunting challenge for the industry. Recent approaches including membrane modification with two-dimensional (2D) nanosheets, showed susceptibility to swelling, fouling, and instability during operation. As a game-changer approach, a polyacrylonitrile (PAN) UF membrane modified with 3D nanostructured composite of MXene and O-MWCNT was introduced for the first time to treat complex oily wastewater. The composite membrane showed high separation performance of soluble dye-oil-water emulsion while maintaining high water permeability. Moreover, during the operational period, the composite membrane exhibits excellent antifouling and anti-swelling properties due to the synergetic effects conferred by the 3D nanostructures. Furthermore, the composite membrane possesses remarkable chemical stability evidenced by its high corrosion resistance when exposed to a strong acid (3 M HCl) and oxidant (NaOCl) solution for a long-time period. Overall, the operational stability was maintained in terms of flux and high rejection of oil and dye over a 45 h long-term operation. Consequently, this work provides an innovative, stable, and highly facile process for fabricating scalable UF composite membrane for the treatment of complex oily wastewater in a harsh chemical environment.
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