Superhydrophilic and underwater superoleophobic polylactide/cellulose diacetate composite nanofibrous membranes for effective oil-in-water emulsions separation
Separation and Purification Technology(2024)
摘要
Electrospun polylactide (PLA) fibrous membranes, characterized by good biodegradability and high porosity, demonstrate significant potential for oily wastewater treatment. However, the inherent hydrophobicity of PLA poses a significant challenge in separating oil-in-water emulsions. Herein, a facile and effective strategy was proposed to fabricate a PLA based nanofibrous membrane for oil-in-water emulsions separation. By combining the electrospinning and nonsolvent-induced phase separation technologies, hydrophilic cellulose diacetate (CDA) networks were in-situ constructed throughout the entire body of PLA fibrous membrane, resulting in a unique hierarchical porous structure. As a result, the obtained PLA/CDA composite nanofibrous membrane exhibited intriguing superhydrophilicity and underwater superoleophobicity, as well as gratifying separation performances for various oil-in-water emulsions solely under the driving force of gravity. Furthermore, the PLA/CDA composite nanofibrous membrane could be easily reused and will not bring out significant environmental concerns after extended use and disposal. We anticipate that this work could pave a way for the development of environmentally friendly membranes for oily wastewater treatment.
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关键词
Polylactide,Cellulose diacetate,Nanofibrous membrane,Superhydrophilic and underwater superoleophobic,Oil-in-water emulsions separation
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