Abstract
Absorption is one of the most important methods for oil spill cleanup. An ideal absorbent is expected to possess advantages of low cost, green, high absorption capacity and excellent reusability. In this paper, a facile and environmentally-friendly top-down approach was developed for the preparation of the highly mesoporous and compressible sugarcane aerogel. Individualization of cellulose microfibrils within the sugarcane cell wall structure without introducing mechanical disintegration was realized, prepared by oxidation of delignified sugarcane at the neutral condition with TEMPO/NaClO/NaClO2 system. The results proved that the cellulose nanofibers in the cell wall maintains their natural alignment structure. The high fibril orientation and ordered arrangement of the network-like microstructure can be processed into anisotropic aerogels with high porosity (98.8%) and high compressive strength (0.53 MPa at 80% strain). The increased porosity and partial cellulose fibrillation result in specific surface areas of 32.94 m2/g. Subsequent hydrophobic coating with methyltrimethoxysilane, the hydrophobic and oleophilic sugarcane aerogel (water contact angle as high as 145.73°) was capable of adsorbing a wide range of organic solvents and oils (22.8 ~ 40.2 g/g). Moreover, the porous aerogel maintained a high oil-absorption capacity after absorbing and squeezing multiple times. This new sugarcane aerogel offers potential possibilities for the subsequent in high efficiency oil–water separation applications.
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The datasets used or analysed during the current study are available from the corresponding author on reasonable request.
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This work was financially sponsored by the Key R & D Plan of Zhejiang Province of China (Nos. 2020C04015 and 2021C03160), the Science and Technology Program of Zhejiang Province of China (No. LGF18C160002), the Natural Science Foundation of Zhejiang Province of China (No. LY19C160010) and the Science Foundation of Zhejiang Sci-Tech University (ZSTU) (No. 21202297-Y). Throughout the writing of this dissertation I have received a great deal of support and assistance. I would particularly like to acknowledge my teammate/group mate/team members for their wonderful collaboration and valuable guidance throughout my studies. They provided me with the tools that I needed to choose the right direction and successfully complete my dissertation.
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Conceptualization: XC, SY. Methodology: XC. Validation: SY. Formal analysis: XC, TC. Resources: MR, JC. Data Curation: MR, XC, YG. Writing—Original Draft: XC. Writing—Review & Editing: SY, YZ. Supervision: YZ, HS. Project administration: HS, YZ, YK. Funding acquisition: LL, HS, YZ.
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Chen, X., Yang, S., Chen, T. et al. Highly mesoporous and compressible sugarcane aerogel via top-down nanotechnology as effective and reusable oil absorbents. Cellulose 30, 1057–1072 (2023). https://doi.org/10.1007/s10570-022-04949-0
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DOI: https://doi.org/10.1007/s10570-022-04949-0