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    Stability and photo demulsification of oil-in-seawater Pickering emulsion based on Fe3+ induced amphiphilic alginate

    Journal: Carbohydr. Polym., Volume 289, AUG 1

    Authors: Xiong, Chuang; Cao, Xinyu; Zhao, Xinyu; Yang, Shujuan; Huang, Junhao; Feng, Yuhong; Yu, Gaobo; Li, Jiacheng

    Organizations: Hainan provincial Science & Technology Program [ZDYF2020191]; National Natural Science Foundation of China [22068011]

    Keywords: Ionic crosslinking; Interface aggregation; Interpenetrating network; Oil/water separation

    The oil/water separation of oil-in-seawater emulsion plays an important role in resource recovery and ecological environment restoration. In this work, oil-in-seawater Pickering emulsion in seawater with high salinity was stabilized by Fe3+ ions and amphiphilic alginate (AM-Alg), subsequently destabilized by UV light for efficient oil/water separation. Initially, AM-Alg exhibited high viscoelasticity at the oil-water interface, which was confirmed by Quartz crystal microbalance. The addition of Fe3+ caused the aggregation of AM-Alg at the oil-water interface and improved the formation of the three-dimensional interpenetrating network structure. When Fe3+ was at 0.1 mol/dm(3), the oil-in-seawater Pickering emulsion had the best stability, and also the fastest demulsification speed under UV light. Moreover, the photochemical redox reaction rate and the conversion rate of Fe3+ were the highest. This photo demulsification technology is expected to become a new method of dealing with marine oil spills.
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