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    Design of poly ionic liquids modified cotton fabric with ion species-triggered bidirectional oil-water separation performance

    Year: 2020

    Journal: J. Hazard. Mater., Volume 400, DEC 5

    Authors: Zhang, Xiang; Chen, Qin; Wei, Ran; Jin, Lunqiang; He, Chao; Zhao, Weifeng; Zhao, Changsheng

    Organizations: National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [51803131, 51673125, 51773127, 51873115, 51803134]; State Key Research Development Program of ChinaState Key Development Program for Basic Research of China [2016YFC1103000, 2018YFC1106400]; Science and Technology program of Sichuan Province [2017SZ0011, 2019YJ0132]; International Visiting Program for Excellent Young Scholars of SCU

    Keywords: Poly ionic liquids; Cotton fabric; Ion species response; Switchable wettability; Oil-water separation

    A novel ion species-responsive oil-water separation material was designed: poly ionic liquid (PIL) was carried on Keywords: the graphene oxide (GO) by free radical polymerization, then the PIL modified GO sheets (GO-PIL) were coated on cotton fabric (CF). The wettability of the obtained GO-PIL coated CF (GO-PIL@CF) could be switched between hydrophilic and hydrophobic state with the exchange of different types of counteranions. Water contact angle of the GO-PIL@CF could be switched between 0 to about 145 degrees; and correspondingly the underwater oil contact angle would change between about 148 to 0 degrees. Because of the switchable wettability, the GO-PIL@CF could selectively separate water or oil from the oil-water mixtures. Meanwhile, due to the loose fibrous structure, the GO-PIL@CF showed relatively high permeate fluxes; in the hydrophilic state the water flux was about 36000 L/m(2)h, while in the hydrophobic state the fluxes for the low-density oils (n-hexane and toluene) were about 59,000 and 65000 L/m(2)h, respectively. Consequently, the separation processes could be completed simply by gravity. In addition, because of the soft and flexible mechanical property, the GO-PIL@CF could serve as wrappage of traditional absorbents and be applied directly as absorbent to remove water or oil selectively from their mixtures.
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