Interfacial charge demulsification endowed dual-network photocatalytic hydrogen-bonded PVA@agarose membranes for oil-water separation.

Journal of hazardous materials Pub Date : 2024-10-05 Epub Date: 2024-08-17 DOI:10.1016/j.jhazmat.2024.135569
Jing Jing, Zhanjian Liu, Yuxin Fu, Haonan Liu, Xiguang Zhang, Meiling Li, Liyan Liu, Huaiyuan Wang
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Abstract

Hydrogel materials with hydrophilic cross-linked network exhibit remarkable super-wettability, enabling their widespread application in oily wastewater treatment. However, the single and loose structure lacks sufficient strength and porosity to resist long-term degradation. Herein, a structural synergistic molecular strategy was reported to introduce reinforcing phase structures and interfacial active sites into the polymer networks for long-term oil-water emulsion separation. The carbon skeleton was uniformly interspersed through the strongly hydrogen-bonded polymer chains via covalent bonds, resulting in a hydrogel network with high mechanical strength and exceptional flow conductivity, which maintained a separation flux of 1233 L m-2 h-1 after 20 separation cycles under gravitational force. Dense negative charges on the surface disrupted the internal charge stability of the oil-water emulsion, leading to remarkable demulsification with a separation efficiency exceeding 99 %. Simultaneously, the strong redox reaction of the photoheterojunction effectively removed organic dyes under visible light, enhancing the overall antifouling performance. This study provided a feasible strategy at the molecular level for optimizing the suitability of hydrogels for oil-water emulsion separation.

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用于油水分离的双网络光催化氢键 PVA@AGarose 膜的界面电荷破乳作用。
具有亲水交联网络的水凝胶材料表现出显著的超强润湿性,使其在含油废水处理中得到广泛应用。然而,这种单一而松散的结构缺乏足够的强度和孔隙率,无法抵抗长期降解。本文报告了一种结构协同分子策略,在聚合物网络中引入增强相结构和界面活性位点,以实现长期的油水乳液分离。碳骨架通过共价键均匀地穿插在强氢键聚合物链中,从而形成了具有高机械强度和优异流动传导性的水凝胶网络,在重力作用下进行 20 次分离循环后,其分离通量仍能保持在 1233 L m-2 h-1 的水平。表面密集的负电荷破坏了油水乳液内部电荷的稳定性,导致显著的破乳化,分离效率超过 99%。同时,光电氧化结的强氧化还原反应能在可见光下有效去除有机染料,提高了整体防污性能。这项研究为优化水凝胶在油水乳状液分离中的适用性提供了分子水平上的可行策略。
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