Journal
INDUSTRIAL CROPS AND PRODUCTS
Volume 108, Issue -, Pages 303-311Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.indcrop.2017.06.059
Keywords
Kapok fiber; ZnO needles; Continuous collection; Oil droplets; Transparency; Chemical durability
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Funding
- Key Scientific Research Project of Beifang University of Nationalities [2015KJ27]
- Ningxia Natural Science Foundation [NZ. 15099]
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A kind of superhydrophobic/superoleophilic kapok fiber for separating oil/water mixtures and oil-in-water emulsions was successfully fabricated. The facile preparation procedure includes uniform growth of ZnO nanoneedles on the surface of kapok fiber via one-step hydrothermal method and subsequent hydrophobic modification with dodecanethiol (DDT). The as-prepared fiber shows high sorption capacities up to 40.8-70 times its self-weight for a series of oils and organic solvents, quick oil sorption rate, and selective sorption to oils in water. Furthermore, superhydrophobic fiber assembly connected to a vacuum system is able to continuously remove and collect a large amount of oils within a short time. More importantly, the obtained fiber is capable of separating oil-in-water emulsions with high separation efficiency (transparency: > 86.4%). The coated fiber can still keep stable hydrophobicity under harsh conditions (acidic, alkaline, salty solutions, oils, and hot water). The as-prepared sorbent is low cost and environmental friendly, which makes it a promising candidate to be used in effective oil-spill cleanups and water purification.
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