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      Superhydrophobic Polypyrrole-Coated Cigarette Filters for Effective Oil/Water Separation

      , , , ,
      Applied Sciences
      MDPI AG

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          Abstract

          To facilitate the recycling and reuse of cigarette filters and oil/water separation, a superhydrophobic cigarette filter was made by coating with dodecanethiol-modified polypyrrole (Ppy) particles by a dip-coating method. SEM, FTIR, and XPS were used to analyze the surface morphology and chemical compositions. The as-prepared superhydrophobic cigarette filter can realize wettability alteration via changing the ammonium persulfate (APS) concentration from 0.15 mol/L to 3 mol/L, and the contact angle increased from 0° on the original cigarette filter to 155° with a sliding angle of 5°. The superhydrophobic cigarette filter could effectively separate various oils and organic solvents. The separation efficiency was 98.8% and the separation stability was good. Furthermore, the as-prepared superhydrophobic cigarette filter had a large oil absorption range and could absorb different oils and organic solvents, including petroleum ether, engine oil, vegetable oil, n-hexane, and chloroform, with maximum absorption capacities ranging from 9.4 g/g to 22.7 g/g. According to the above results, we believe that the as-prepared superhydrophobic cigarette filter should have great potential in the recovery of solid waste and high-efficiency oil/water separation.

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          Oil/water separation techniques: a review of recent progresses and future directions

          The recent progress of oil/water separation technologies using various materials that possess surface superwetting properties is summarized. Oil/water separation is a field of high significance as it has direct practical implications for resolving the problem of industrial oily wastewater and other oil/water pollution. Therefore, the development of functional materials for efficient treatment of oil-polluted water is imperative. In this feature article, we have reviewed the recent progress of oil/water separation technologies based on filtration and absorption methods using various materials that possess surface superwetting properties. In each section, we present in detail representative work and describe the concepts, employed materials, fabrication methods, and the effects of their wetting/dewetting behaviors on oil/water separation. Finally, the challenges and future research directions of this promising research field are briefly discussed.
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            Joule-heated graphene-wrapped sponge enables fast clean-up of viscous crude-oil spill

            High-speed absorption of vicious crude oil spill into oil sorbent was realized by introducing the Joule heating effect of graphene to the interface between the skeleton surfaces of sorbent and oil.
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              Continuous, High-Speed, and Efficient Oil/Water Separation using Meshes with Antagonistic Wetting Properties

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                Author and article information

                Journal
                ASPCC7
                Applied Sciences
                Applied Sciences
                MDPI AG
                2076-3417
                March 2020
                March 13 2020
                : 10
                : 6
                : 1985
                Article
                10.3390/app10061985
                3424e74e-bf86-460e-9816-d5110bb855ac
                © 2020

                https://creativecommons.org/licenses/by/4.0/

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