Self-assembled silica aerogel-coated polylactic acid membrane for water-in-oil emulsion separation

The separation of oil-water system is of great significance to environmental protection, but the efficient separation of water-in-oil emulsions with emulsifier still faces challenges. Herein, the hydrophobic silica (SiO 2 ) aerogel and microporous polylactic acid (PLA) membrane were prepared firstly...

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Veröffentlicht in:Journal of sol-gel science and technology 2023-03, Vol.105 (3), p.694-700
Hauptverfasser: Lu, Chunshuai, Lang, Xianhua, Yu, Zhen, Yang, Lijuan, Yang, Menghan, Zhang, Zhenxiu
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Sprache:eng
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Zusammenfassung:The separation of oil-water system is of great significance to environmental protection, but the efficient separation of water-in-oil emulsions with emulsifier still faces challenges. Herein, the hydrophobic silica (SiO 2 ) aerogel and microporous polylactic acid (PLA) membrane were prepared firstly, then the SiO 2 aerogel was deposited on the surface of PLA by self-assembly, an effective SiO 2 aerogel @ PLA membrane for water-in-oil emulsions separation was prepared. Low surface energy and multi-scale roughness were achieved simultaneously by uniformly assembling SiO 2 aerogel on PLA surface. SiO 2 aerogel dramatically enhanced the hydrophobicity of PLA membrane, and the in-air water contact angle was reached to 150 o . Benefiting from the super lipophilic property in air and super hydrophobicity under oil, SiO 2 aerogel @ PLA membrane exhibited excellent separation ability for surfactant stabilized water-in-oil emulsions. This work provided experimental and theoretical basis for excellent water-in-oil emulsions separation, and showed great significance in environmental protection. Graphical Abstract Highlights SiO 2 aerogel @ PLA microporous membrane was prepared by self-assembly. The membrane possessed super hydrophobicity and the in-air water contact angle was 150 o . The membrane showed separation efficiency for the surfactant-stabilized water-in-oil emulsion.
ISSN:0928-0707
1573-4846
DOI:10.1007/s10971-023-06045-6