Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 9, Issue 27, Pages 15310-15320Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ta03195c
Keywords
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Funding
- National Natural Science Foundation of China [51773033, 21961132024, 51925302]
- Innovation Program of Shanghai Municipal Education Commission [2017-01-07-00-03-E00024]
- Fundamental Research Funds for the Central Universities [223201900081, 17D310107]
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Inspired by the taro leaf, a biomimetic nanofibrous membrane has been developed for efficient separation of oil-in-water emulsions, showcasing excellent superhydrophilicity, underwater superoleophobicity, and low oil adhesion. The membrane also exhibits self-cleaning properties and high flux recovery ratio, offering a new solution for wastewater purification.
Water pollution caused by oil has placed a significant burden on the ecosystem and human health. However, the present membranes suffer from a serious oil fouling issue during long-term oily wastewater remediation, which has limited their practical applications. Herein, inspired by the taro leaf, we develop a biomimetic nanofibrous membrane composed of BiOBr microspheres anchored on electroconductive SiO2/polyaniline (PANI) core-shell nanofibers. Due to the surface multiscale structures and hydrophilic matrix, the biomimetic membrane shows intriguing superhydrophilicity, underwater superoleophobicity, and low-oil-adhesion. Benefitting from the high porosity and sub-micrometer pores, the membrane exhibited superior capability for separating highly emulsified oil-in-water emulsions with a promising permeation flux of 6140 L m(-2) h(-1) and a high separation efficiency (total organic carbon content <5 mg L-1). Importantly, the presence of BiOBr/PANI heterojunction arrays with visible light catalytic activity and 3D PANI electroconductive networks effectively imparts desirable self-cleaning properties, maintaining a high flux recovery ratio >98%. The synthesis of such biomimetic nanomaterials may open up new avenues for developing high-performance separation materials for the purification of large volumes of wastewater.
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