An ultrathin<i>in situ</i>silicification layer developed by an electrostatic attraction force strategy for ultrahigh-performance oil–water emulsion separation

Zhang, Lei; Lin, Yuqing; Wu, Hsuan-Chung; Cheng, Liang; Sun, Yuchen; Yasui, Tomoki; Yang, Zhe; Wang, Shengyao; Yoshioka, Tomohisa; Matsuyama, Hideto

doi:10.1039/c9ta07988b

Cited by 54 publications

(40 citation statements)

References 64 publications

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“…Based on sieving effect and special wettability, the superhydrophilic membranes could be used to separate oil-in-water emulsions. [14][15][16][17][18][19] The relationship of micro/nanostructure of the membrane and the separation efficiency is rarely discussed.…”

Section: Introductionmentioning

confidence: 99%

Zwitterionic Polymer Hairy Coating onto Mesh toward Easy Oil/Water Separation

Wang

Liu

Shao

et al. 2022

Macromol. Rapid Commun.

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A zwitterionic polymeric hair‐coated stainless steel mesh membrane is fabricated, which demonstrates efficient separation of oil/water mixtures and emulsions. The hairy coating of poly(divinylbenzene‐co‐vinylbenzene chloride) is generated by precipitation cationic polymerization, and subsequently grafting a zwitterionic polymer layer by atom transfer radical polymerization of sulfobetaine methacrylate. The microstructure of the hairy coating is tunable from an array of individual nanofibers to porous networks by interweaving of the hairs. The long‐range attraction of zwitterionic polymers with water renders the coated mesh with excellent superhydrophilic and underwater superoleophobic performance. The coated mesh is highly antifouling to avoid the prehydration in conventional methods. Moreover, the microstructure is demonstrated to be responsible for the high separation efficiency of oil/water emulsion. Therefore, separation of oil/water mixtures and emulsions becomes easier by the coated mesh, which is promising in industrial oil field sewage treatment.

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Section: Introductionmentioning

confidence: 99%

Zwitterionic Polymer Hairy Coating onto Mesh toward Easy Oil/Water Separation

Wang

Liu

Shao

et al. 2022

Macromol. Rapid Commun.

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“…Polyketone (PK) is a semi-crystalline thermoplastic synthesized via the palladium-catalyzed alternating copolymerization of α-olefins and carbon monoxide. , PK has received widespread attention because of its good processability, excellent mechanical properties, high chemical resistance, high impact strength, and low gas permeability. − More importantly, a great deal of 1,4-dicarbonyl structures in the PK backbone makes it highly chemically reactive in solution and is easily modified for multifunctional applications of PK. − Aromatic polymers are commonly employed as the raw materials of AEM. In the procedure of introducing functional groups, chloromethylation and Menshutkin reaction are relatively complicated, and highly toxic agents are typically used. − The reaction of 1,4-dicarbonyl with various groups provides a method for introducing functional groups into the PK backbone.…”

Section: Introductionmentioning

confidence: 99%

Electrospun Modified Polyketone-Based Anion Exchange Membranes with High Ionic Conductivity and Robust Mechanical Properties

Zhou

Bao

Liu

et al. 2021

ACS Appl. Energy Mater.

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It is still a significant challenge to rationally design and delicately process or fabricate anion exchange membranes (AEMs) with high ionic conductivity, good mechanical properties, and sufficient alkaline stability. Here, a polyketone (PK) resinbased AEM was synthesized via the Paal−Knorr reaction and quaternary ammonium reaction, and then processed by electrospinning and hot pressing technologies. In contrast to a quaternized functional polyketone-based polyelectrolyte (QAFPK) fabricated by casting, the electrospun QAFPK shows higher hydroxide conductivity and robust mechanical properties. QAFPK-1-6-E realizes a hydroxide conductivity of 181 mS/cm at 80 °C and a tensile strength of 54 MPa. The microphase structure characterization indicates that the electrospinning process can induce the formation of an excellent ion-conducting structure. The electrospun PKbased AEM displays great application potential in a variety of electrochemical devices under alkaline conditions, such as alkaline anion exchange membrane fuel cells (AAEMFCs).

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“…Chloroform was used to evaluate the underwater oleophobicity of the coatings because the surface wetting property of PK membranes is more sensitive to this polar oil, as demonstrated in our previous studies. 24,53 The changes in the underwater chloroform contact angles of the rTA-PK and sTA-PK membranes with the number of LbL assembly cycles are shown in Figure 5. The underwater chloroform contact angle increased with an increase in the number of coating cycles.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Nanostructural Manipulation of Polyphenol Coatings for Superwetting Membrane Surfaces

Jia

Guan

Zhang

et al. 2021

ACS Sustainable Chem. Eng.

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Functional coatings have gained significant attention in multiple environmental and energy-related research fields. One of the coatings with superwetting surfaces has received significant interest, owing to the favorable properties like self-cleaning and antifouling as well as the roles it plays in processes of water harvesting and oil–water separation. Hydrophilic polyphenol molecules show good adhesion to different substrates and provide multiple interactive sites, which serve as building blocks for the preparation of superwetting coatings. In this study, to realize the controlled formation of a polyphenol-based coating and to demonstrate the nanostructural dependence of its superwetting performance, tannic acid (TA) complexed with cations was employed to construct coating networks with either nanorough or nanosmooth surface morphology through a layer-by-layer (LbL) self-assembly method. Both nanostructures could be precisely controlled by adjusting the TA concentration and number of LbL cycles to observe the evolution of the wetting state of the coating. More importantly, while the nanosmooth and nanorough coatings exhibited similar surface chemistry, pore sizes, and superwetting properties, the separation efficiency for oil-in-water emulsions using the membrane with the nanorough coating is 2–5 and 2–10 times that of the one with a nanosmooth coating and the pristine one without a coating, respectively. The experimental results confirmed that the nanorough coating structure contributed to the superwetting state of the membrane surface and, therefore, possessed a stronger ability to repel oil than the nanosmooth coating during the separation process. This work demonstrates a novel strategy for the molecular self-assembly of polyphenols and may provide guidance for designing superwetting coatings.

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An ultrathinin situsilicification layer developed by an electrostatic attraction force strategy for ultrahigh-performance oil–water emulsion separation

Abstract: Development of SiO2-d-PK membrane via electrostatic attraction forced strategy for oil–water emulsions separation.

Cited by 54 publications

References 64 publications

Zwitterionic Polymer Hairy Coating onto Mesh toward Easy Oil/Water Separation

Zwitterionic Polymer Hairy Coating onto Mesh toward Easy Oil/Water Separation

Electrospun Modified Polyketone-Based Anion Exchange Membranes with High Ionic Conductivity and Robust Mechanical Properties

Nanostructural Manipulation of Polyphenol Coatings for Superwetting Membrane Surfaces

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