Citation: SHI Yanlong, FENG Xiaojuan, YANG Ruihua, WANG Jianrong. Preparation of Superhydrophobic and Superoleophilic Corn Straw Fibers Oil Absorbents and Application to the Removal of Spilled Oil from Water[J]. Chinese Journal of Applied Chemistry, ;2020, 37(7): 793-802. doi: 10.11944/j.issn.1000-0518.2020.07.200030 shu

Preparation of Superhydrophobic and Superoleophilic Corn Straw Fibers Oil Absorbents and Application to the Removal of Spilled Oil from Water

Key Laboratory of Hexi Corridor Resources Utilization of Gansu Universities, College of Chemistry and Chemical Engineering, Hexi University, Zhangye, Gansu 734000, China

Corresponding author: SHI Yanlong, yanlongshi726@126.com
Received Date: 23 January 2020
Revised Date: 23 March 2020
Accepted Date: 29 April 2020

Fund Project: the Scientific Research Foundation of the Higher Education Institutions of Gansu Province 2016B-091Supported by the National Natural Science Foundation of China(No.41761061), "Light of West China" Program of Chinese Academy of Sciences, the Scientific Research Foundation of the Higher Education Institutions of Gansu Province(No.2016B-091), the General Program of the Key Laboratory of Hexi Corridor Resources Utilization of Gansu Universities(No.XZ1603), and the Undergraduate Innovation and Entrepreneurship Training Program of Gansu Province(No.81)the National Natural Science Foundation of China 41761061the General Program of the Key Laboratory of Hexi Corridor Resources Utilization of Gansu Universities XZ1603the Undergraduate Innovation and Entrepreneurship Training Program of Gansu Province 81

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Materials with both superhydrophobicity and superoleophilicity have attracted considerable attention due to the potential application in the removal of the spilled oil from water. In the past decades, numerous techniques have been adopted to construct superhydrophobic and superoleophilic materials, but it is still a great challenge to obtain this kind of material via a more facile, low cost and environmentally friendly method. Herein, corn straw fibers with superhydrophobicity and superoleophilicity were obtained by dip-coating TiO₂ sol and subsequent surface modification with octyltrimethoxysilane (OTS). The contact angle of water droplets and oil droplets on the as-prepared sample is 160° and 0°, respectively. The results indicate that the superhydrophobicity is attributed to the joint effects of natural hierarchical structures with micro/nanometer scale of corn straw fibers and the chemical composition with low surface energy induced by the hydrophobic surface modification. With the characteristics of water repellency and selective oil adsorption, the as-prepared corn straw fibers could be chosen to remove the spilled oil from water with high separation efficiency, stable durability and recyclability. The method presented here is expected to be employed as a technique to prepare oil absorbent with superhydrophobicity and superoleophilicity, which may be used to treat the oily wastewater in practical application with the advantages of low cost, simple method and easy biodegradability as well as stable recyclability.
- corn straw fibers,
- superhydrophobic,
- superoleophilic,
- TiO₂ sol,
- oil adsorption
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