Superamphiphilic aerogels with 2D lamellar structure of gelatin-tuned 3D supramolecular network of collagen fibers for high-performance separation of surfactant-stabilized emulsified oily wastewater

• Published in: Collagen and Leather 2024-12, Vol.6 (1), p.24-9, Article 24
• Main Authors: Liu, Honglian, Xiao, Hanzhong, Hao, Baicun, Zheng, Wan, Wang, Yujia, Huang, Xin, Shi, Bi
• Format: Article
• Language: English
• Subjects: 2D lamellar structure-tuned 3D supramolecular network; Aerogels; Capillarity; Chemistry and Materials Science; Collagen; Collagen-based Advanced Functional Materials; Dual separation; Emulsions; Gelatin; Lamellar structure; Mass transfer; Materials Engineering; Materials Science; Separation; Storage capacity; Structural engineering; Superamphiphilic aerogels; Surfactant-stabilized emulsions; Surfactants; Three dimensional composites; Wastewater treatment; Wettability
• ISSN: 2097-1419; 2731-6998; 2524-7859
• DOI: 10.1186/s42825-024-00166-6

Superwetting aerogel is a promising alternative for the remediation of emulsified oily wastewater for its high porosity combined with extreme wettability enabled high separation performances to emulsion wastewater. However, it remains challenging for superwetting aerogels to accomplish high-performance dual separation to surfactant-stabilized oil-in-water (O/W) and water-in-oil (W/O) emulsions with high stability. Herein, an environmentally benign superamphiphilic composite aerogel was prepared by a green synthesis route that relied on the utilization of natural amphiphilic biomass. Collagen fibers (CFs) were utilized to construct the three-dimensional (3D) supramolecular skeleton of aerogel to provide high storage capacity of water/oil and outstanding capillary effect to boost the mass transfer. The two-dimensional (2D) lamellar structure of gelatin (Gel) was further grown on the skeleton of CFs aerogel to play the role for simultaneously enhanced demulsifying capability and spreading of emulsions. The as-prepared superamphiphilic aerogel enabled the separation of highly stable surfactant-stabilized O/W and W/O emulsions with high separation efficiency and flux. Excellent recycling performances and anti-fouling performance were also confirmed. Our investigations therefore demonstrated that the structural engineering of superamphiphilic aerogel is a promising way to realize high-performance dual separation of surfactant-stabilized O/W and W/O emulsion wastewater. Graphical Abstract