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Open AccessArticle

Complex Aerogels Generated from Nano-Polysaccharides and Its Derivatives for Oil–Water Separation

1
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Center for Advanced Low-dimension Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China
2
Department of Textile Engineering, Faculty of Industries Engineering and Technology, University of Gazira, Wad-Madani, P.O. Box 20, Sudan
3
R & D Center, Vontron Membrane Technology Co., Ltd., Guiyang 550000, China
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Polymers 2019, 11(10), 1593; https://doi.org/10.3390/polym11101593
Received: 20 August 2019 / Revised: 21 September 2019 / Accepted: 25 September 2019 / Published: 29 September 2019
(This article belongs to the Special Issue Cellulose and Renewable Materials)
The complex aerogel generated from nano-polysaccharides, chitin nanocrystals (ChiNC) and TEMPO-oxidized cellulose nanofibers (TCNF), and its derivative cationic guar gum (CGG) is successfully prepared via a facile freeze-drying method with glutaraldehyde (GA) as cross-linkers. The complexation of ChiNC, TCNF, and CGG is shown to be helpful in creating a porous structure in the three-dimensional aerogel, which creates within the aerogel with large pore volume and excellent compressive properties. The ChiNC/TCNF/CGG aerogel is then modified with methyltrichlorosilane (MTCS) to obtain superhydrophobicity/superoleophilicity and used for oil–water separation. The successful modification is demonstrated through FTIR, XPS, and surface wettability studies. A water contact angle of 155° on the aerogel surface and 150° on the surface of the inside part of aerogel are obtained for the MTCS-modified ChiNC/TCNF/CGG aerogel, resulting in its effective absorption of corn oil and organic solvents (toluene, n-hexane, and trichloromethane) from both beneath and at the surface of water with excellent absorption capacity (i.e., 21.9 g/g for trichloromethane). More importantly, the modified aerogel can be used to continuously separate oil from water with the assistance of a vacuum setup and maintains a high absorption capacity after being used for 10 cycles. The as-prepared superhydrophobic/superoleophilic ChiNC/TCNF/CGG aerogel can be used as a promising absorbent material for the removal of oil from aqueous media. View Full-Text
Keywords: cellulose nanofiber; chitin nanocrystals; cationic guar gum; aerogel; oil absorption cellulose nanofiber; chitin nanocrystals; cationic guar gum; aerogel; oil absorption
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Yagoub, H.; Zhu, L.; Shibraen, M.H.M.A.; Altam, A.A.; Babiker, D.M.D.; Liang, S.; Jin, Y.; Yang, S. Complex Aerogels Generated from Nano-Polysaccharides and Its Derivatives for Oil–Water Separation. Polymers 2019, 11, 1593.

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