Delignified wood with unprecedented anti-oil properties for the highly efficient separation of crude oil/water mixtures

It remains a challenge to develop anti-oil fouling materials for crude oil spills or other oily wastewater cleanups. Herein, we report delignified wood with a cellulose coating for its excellent oil-repellent properties and efficient crude oil/water separation abilities. The delignified wood shows s...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2019, Vol.7 (28), p.16735-16741
Main Authors: Wu, Ming-Bang, Hong, Yong-Ming, Liu, Chang, Yang, Jing, Wang, Xin-Ping, Agarwal, Seema, Greiner, Andreas, Xu, Zhi-Kang
Format: Article
Language:English
Subjects:
Acetic acid
Cellulose acetate
Coating
Coatings
Contamination
Crude oil
Hemicellulose
Hydroxyl groups
Impurities
Lignin
Oil pollution
Oil spills
Organic chemistry
Properties (attributes)
Separation
Underwater
Wastewater treatment
Wood
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Summary:It remains a challenge to develop anti-oil fouling materials for crude oil spills or other oily wastewater cleanups. Herein, we report delignified wood with a cellulose coating for its excellent oil-repellent properties and efficient crude oil/water separation abilities. The delignified wood shows stable water binding affinity and an ultralow underwater adhesion force. It is not only useful for totally separating or collecting crude oil from oily wastewater with no decline in water permeation flux during long-term operation, but also shows good pH stability and high salt resistance. The excellent anti-oil properties originated from the chemical structure of cellulose, in which the hydrophilic hydroxyl groups are densely and symmetrically linked to the main chains. It is capable of being further improved with a cellulose coating fabricated from the hydrolysis of cellulose acetate. The cellulose coating allows the delignified wood to remove oil contamination from its surfaces both in a pre-hydration state and in a dry state while the nascent state only works well underwater because of remaining impurities, like lignin and hemicellulose. Our results demonstrate that the delignified wood and cellulose coating show great potential in the practical treatment of oily wastewater. Delignified wood with unprecedented anti-oil properties is fabricated for the highly efficient separation of crude oil/water mixtures.
ISSN:2050-7488
2050-7496
DOI:10.1039/c9ta04913d