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Membrane materials have been extensively applied in the field of separation of oil–water mixtures. However, most membrane materials are limited to separate oil–water mixtures and difficult to separate stable oil–water emulsions. Therefore, the polymer membrane, which is a type of underwater superoleophobic membrane material, has attracted extensive attention for its excellent antipollution performance and emulsion separation ability. In this work, we combined the synthesized poly (acrylic acid)‐co‐poly(3‐[trimethoxysilyl]propyl methacrylate) (PAA‐co‐PTMSPMA) with micro–nanoparticles to modify polyvinylidene fluoride (PVDF) membranes. By means of this strategy, PVDF membranes with excellent superhydrophilicity–underwater superoleophobicity were successfully fabricated. The obtained PVDF membrane could efficiently realize the separation of various oil‐in‐water emulsions, and the separation efficiency was greater than 99%. In addition, the separation efficiency of the modified superhydrophilic PVDF membrane maintained stable after 10 separation cycles (>98.6%). When relying on this simple and eco‐friendly preparation strategy, this superhydrophilic–underwater superoleophobic membrane material has broad application prospects in the field of industrial and domestic wastewater treatment. [ABSTRACT FROM AUTHOR]

At present, various water pollution problems have attracted extensive attention all over the world. Among them, a large amount of wastewater contains oil-water emulsions, heavy metal ions, organic dyes and other pollutants. Therefore, it is urgent to prepare multifunctional materials that can separate these pollutants. In this paper, superhydrophilicity/underwater superoleophobicity PVDF membrane and superhydrophilicity/underwater superoleophobicity polyester fiber were successfully prepared by deposition of suspension containing montmorillonite, β-cyclodextrin, tannic acid and sodium alginate on the substrate. The modified membrane showed good durability and stability under extreme environmental conditions such as different pH conditions, salt immersion test, ultraviolet irradiation and mechanical wear. he modified polyester fiber membrane can effectively separate oil-water mixture and various oil-in-water emulsions. More importantly, the modified PVDF membrane can effectively adsorb organic dyes and heavy metal ions, filter the mixture of oil, organic dyes and various heavy metal ion solutions, and the separation efficiency is very high. Based on all the advantages mentioned above, this study provides a new idea for the efficient adsorption of organic dyes and heavy metal ions and the efficient separation of oil-water mixtures. [Display omitted] [ABSTRACT FROM AUTHOR]