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Preparation of novel cotton fabric composites with pH controlled switchable wettability for efficient water-in-oil and oil-in-water emulsions separation

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Abstract

The wetting materials with the ability of controllable oil/water separation have drawn more and more public attention. In this article, the novel cotton fabric (CF) with pH controlled wettability transition was designed by a simple, environmentally friendly coating copolymer/SiO2 nanoparticles, poly(heptadecafluorodecyl methacrylate-co-3-trimethoxysilylpropyl methacrylate-co-2-vinilpiridine) (PHDFDMA-co-PTMSPMA-co-P2VP). Furthermore, the structures and morphologies of coated CF were confirmed by Fourier transform infrared spectroscopy (FTIR), NMR, GPC, scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). The coated CF exhibits switchable wettability between superhydrophobicity and superhydrophilicity via adjusting pH value. When the coated CF is placed in the neutral aqueous (pH = 7.0), it is superhydrophobic in the air and superoleophilic. It allows oil to go through but blocking water. However, in acidic aqueous environment (pH = 3.0), it turns superhydrophilic and underwater superoleophobic, which allows water to penetrate but blocking oil. Therefore, the coated CF could be applied to separate oil/water mixtures, ternary oil/water/water mixtures continuously and different surfactant stabilized emulsions (oil-in-water, water-in-oil) and displays the superior separation capacity for oil–water mixtures with a high efficiency of 99.8%. Moreover, the cycling tests demonstrate that the coated CF possesses excellent recyclability and durability. Such an eminent, controllable water/oil permeation feature makes coated CF could be selected as an ideal candidate for oil/water separation.

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Acknowledgements

This work was supported financially by funding from the National Natural Science Foundation of China (21367022 and 51662036), Bingtuan Innovation Team in Key Areas (2015BD003), Engineering Research Center of Materials-Oriented Chemical Engineering of Xinjiang Bintuan (2016BTRC008, 2016BTRC005) and Graduate Student Scientific Research Innovation Projects in Xinjiang Autonomous Region (XJGRI2017046).

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Authors and Affiliations

  1. School of Chemistry and Chemical Engineering, Shihezi University/Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan/Key Laboratory of Materials-Oriented Chemical Engineering of Xinjiang Uygur Autonomous Region/Engineering Research Center of Materials-Oriented Chemical Engineering of Xinjiang Bingtuan, Beisi Road, Shihezi, 832003, Xinjiang, People’s Republic of China

    Qian Wang, Jianning Wu, Guihua Meng, Yixi Wang, Zhiyong Liu & Xuhong Guo

  2. State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, People’s Republic of China

    Xuhong Guo

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  1. Qian Wang
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  2. Jianning Wu
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  3. Guihua Meng
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  4. Yixi Wang
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  5. Zhiyong Liu
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Correspondence to Zhiyong Liu.

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Wang, Q., Wu, J., Meng, G. et al. Preparation of novel cotton fabric composites with pH controlled switchable wettability for efficient water-in-oil and oil-in-water emulsions separation. Appl. Phys. A 124, 422 (2018). https://doi.org/10.1007/s00339-018-1781-4

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