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    Zwitterionic hydrogel-coated cotton fabrics with underwater superoleophobic, self-healing and anti-fouling performances for oil-water separation

    Year: 2021

    Journal: Sep. Purif. Technol., Volume 279, DEC 15

    Authors: Liu, Hongyu; Yang, Lin; Dou, Baojie; Lan, Jianwu; Shang, Jiaojiao; Lin, Shaojian

    Organizations: National Natural Sci-ence Foundation of China [21876119]; Fundamental Research Funds for the Central Universities [YJ201823, YJ201959]; Sichuan Science and Technology Program [2020YJ0316, 2021YJ0290]

    Keywords: Zwitterionic hydrogel; Self-Healing; Anti-fouling; Underwater superoleophobic; Oil-water separation

    Oil-water separation technology has attracted widespread attention, due to the increasingly serious oil pollution. In this work, novel poly(sulfobetaine methacrylate-co-2-hydroxyethyl acrylate)/poly(vinyl alcohol)/borax (PSBMA/PVA/Borax) hydrogels were prepared. Then, the related gel-coated cotton fabrics for oil-water separation were successfully developed in a facile route. The results presented the as-prepared zwitterionic hydrogels had outstanding self-healing ability, low swelling ratio, and satisfactory mechanical properties because of multiple interactions in the hydrogel's network. As expected, the zwitterionic hydrogel-coated cotton fabric was imparted with excellent underwater superoleophobicity and outstanding anti-fouling ability due to the existence of zwitterionic groups on the surface. The underwater oil contact angle of the as-prepared fabric was approximately 160 degrees towards a series of oils. Meanwhile, oily contaminations on the zwitterionic hydrogel-coated fabric surface can be rapidly removed just by water immersion. Most importantly, the zwitterionic hydrogel-coated fabric exhibited excellent oil-water separation efficiency (approximately 99%) and water flux (about 15, 181 L-1.m(-2) .h(-1)) even after 50 successive cycles. Additionally, the zwitterionic hydrogel-coated fabric also presented remarkable chemical and mechanical stabilities in harsh conditions. The as-prepared cotton fabric presents a great application prospect in oily wastewater treatment.
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