The large number of oily wastewater discharges and oil spills are bringing about severe threats to environment and human health.Corresponding to this challenge,a functional PAA-ZnO-HDTMS flax fiber with UV-induced switchable wettability was developed for e伍cient oil-water separation in this study.The developed flax fiber was obtained through PAA grafied polymerization and then Zno-HDTMS nanocomposite immobilization.The as-prepared PAA-ZnO-HDTMS flax fiber was hydrophobic initially and could be switched to hydrophilic through UV irradiation.Its hydrophobicity could be easily recoveredthrough being stored in dark environment for several days.To optimize the performance of the PAA-ZnO-HDTMS flax fiber,the effects of Zno and HDTMS concentrations on its switchable wettability were investigated.The optimized PAA-ZnO-HDTMS flax fiber had a large water contact angle(～1300)in air and an extremely small oil contact angle(～0°)underwater initially.After UV treatment,the water contact angle was decreased to 300,while the underwater oil contact angle was increased to more than 1500.Based on this UV-induced switchable wettability,the developed PAA-ZnO-HDTMS flax fiber was applied to remove oil from immiscible oil-water mixtures and oil-in-water emulsion with great reusability for multiple cycles.Thus,the developed flax fiber could be further fabricated into oil barrier or oil sorbent for oil-water separation,which could be an environmentally-friendly alternative in oil spill response and oily wastewater treatment.

Xiujuan Chen;Yunqiu Liu;Gordon Huang;Chunjiang An;Renfei Feng;Yao Yao;Wendy Huang;Shuqing Weng

Department of Civil Engineering,University of Calgary,Calgary Alberta T2N 1N4,Canada;Institute for Energy,Environment and Sustainable Communities,University of Regina,Regina Saskatchewan S4S 0A2,Canada;Environmental Systems Engineering,University of Regina,Regina Saskatchewan S4S 0A2,Canada;Department of Building,Civil and Environmental Engineering,Concordia University,Montreal Quebec H3G 1M8,Canada;Canadian Light Source,Saskatoon SK S7N 2V3,Canada;McElhanney Inc,Cranbrook British Columbia VIC 7H9,Canada

环境科学与工程前沿

[1]Xiujuan Chen;Yunqiu Liu;Gordon Huang;Chunjiang An;Renfei Feng;Yao Yao;Wendy Huang;Shuqing Weng-.Functional flax fiber with UV-induced switchable wettability for multipurpose oil-water separation)[J].环境科学与工程前沿,2022(12):41-52

grafied,recoveredthrough

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