Ultrasoft gelatin aerogels for oil contaminant removal. Issue 24 (7th June 2016)

• Record Type: Journal Article
• Authors: Wang, Juan; Zhao, Dan; Shang, Ke; Wang, Yu-Tao; Ye, Dan-Dan; Kang, A.-Hui; Liao, Wang; Wang, Yu-Zhong
• Is Part Of: Journal of materials chemistry. Volume 4:Issue 24(2016)
• Page Start: 9381
• Page End: 9389
• Publication Date: 2016-06-07
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c6ta03146c
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : In this study, gelatin-based absorbents were realized via an environmentally friendly freeze-drying process followed by chemical vapor deposition. Abstract : We demonstrated the preparation of a novel aerogel simply by cross-linking a gelatin physical gel with formaldehyde (cGel) and using a subsequent freeze-drying procedure. A hydrophobic absorbent material (MTCS-cGel aerogel) was further obtained by thermal chemical vapor deposition (CVD) of methyltrichlorosilane (MTCS). Rheological tests were carried out to investigate the cross-linking between gelatin and formaldehyde. Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX) and wettability of oil and water results proved that successful silanization occurred on/in the aerogels. These results also indicated that the MTCS-cGels had low densities (5–8 kg m −3 ), high porosities (>95%) with uniform pore sizes, and unique laminar/fibrous 3D networks. The oleophilic aerogels possessed high oil absorption capacities of 70–123 times that of their dry weights. Furthermore, the absorbents exhibited excellent elasticity and ultrasoftness with a stress of only 2.0 kPa at 60% strain. This property endowed the aerogels with super-recyclability where 83–85% of their full absorption capacity was maintained after 5000 times of compression. The high oil absorption performance, super-recyclability, sustainability, biodegradability and cost-efficiency make this novel absorbent a promising candidate for large-scale oceanic oil contaminant removal.