Hierarchical composite membrane with multiscale roughness structures for water-in-oil emulsion separation

Wang, Dong; Zang, Junjiao; Wang, Qingxiang; Cheng, Wanli; Han, Guangping; Huan, Siqi

doi:10.1016/j.apsusc.2021.150666

Cited by 31 publications

(8 citation statements)

References 46 publications

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“…In addition, it can also be seen that the tensile strength of PAN/CuS has been greatly improved as the content of CuS@QCS continues to increase. Compared to pure PAN nanofibers (3.43 Mpa), the tensile strength increased to 9.86 Mpa with the addition of 5 wt % CuS@QCS, which was significantly stronger than previous studies on the strength of PAN fibers. − This enhancement may be due to the good dispersion of CuS@QCS nanoparticles in polymer fibers that can effectively disperse the stress in the stretching process. However, adding excess CuS, such as 10 wt %, leads to a decreased strength (8.07 Mpa) due to the formation of aggregation, preventing the distribution of stress along the fibers.…”

Section: Resultsmentioning

confidence: 72%

Dyeable PAN/CuS Nanofiber Membranes with Excellent Mechanical and Photothermal Conversion Properties via Electrospinning

Qin

Zhang

Pan

et al. 2022

ACS Appl. Polym. Mater.

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Wearable heaters based on photothermal fibers have gained considerable attention for personal thermal management in recent years. However, photothermal fabrics aiming at personal comfort and energy conversion performance still present severe challenges in their design, dyeability, mechanical properties, and practical application. Herein, polyacrylonitrile (PAN)/copper sulfide (CuS) nanofiber membranes with good photothermal and mechanical performance and dyeability were fabricated by electrospinning. The PAN/CuS-5 wt % nanofiber membranes not only exhibit excellent photothermal conversion performance (up to 88 °C within 15 s) and good heating cycle stability under one solar irradiation (1 kW m −2 ) but also high tensile strength (9.86 Mpa). In addition, the PAN/CuS membranes still retained good photothermal properties after the dyeing process. This work develops a robust strategy for constructing photothermal and dyeable fabric and has potential application in personal thermal management.

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Section: Resultsmentioning

confidence: 72%

Dyeable PAN/CuS Nanofiber Membranes with Excellent Mechanical and Photothermal Conversion Properties via Electrospinning

Qin

Zhang

Pan

et al. 2022

ACS Appl. Polym. Mater.

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“…When the destructive load is reached, the fiber membrane shows a necking phenomenon and fracture failure occurs. 34 In summary, the composite membrane exhibits excellent mechanical properties and provides a basis for subsequent applications.…”

Section: Mechanical and Photocatalytic Propertiesmentioning

confidence: 99%

Preparation of superhydrophobic membranes with ultraviolet‐absorbing capacity for oil–water separation by electrospinning

Wang,

2024

Polymer Engineering & Sci

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To address the escalating issue of oily wastewater, separation membranes with special wettability on the surface are widely used in oil–water separation. The development of separation membranes with not only stable separation flux but also anti‐fouling properties is an urgent problem. Therefore, polystyrene/polyacrylonitrile‐polyvinylidene fluoride/polydimethylsiloxane‐titanium dioxide nanoparticle (PS/PAN‐PVDF/PDMS@TiO2) composite membranes with superhydrophobicity and lipophilicity were prepared by electrospinning technique. By changing the doping amount of TiO2 nanoparticles, the multilevel rough structure was constructed on the surface, and the transformation of the Ti–O–C chemical bond to the Si–O–Ti chemical bond was realized inside the composite membrane. The results showed that the composite membrane had excellent superhydrophobicity (154.9°) and mechanical properties (tensile strength of 3.54 MPa, elongation of 60.95%). The membrane can absorb ultraviolet light and exhibits enhanced resistance to fouling when exposed to visible‐UV light. Additionally, the composite membrane demonstrates an adsorption capacity of 30–100 g/g for a wide range of oils. In corrosive environments, the composite membrane maintains superhydrophobicity (above 150°) and achieves high oil–water separation efficiency (97%). After 40 cycles, the separation flux of 6000 L.h−1 m−2 can be maintained. Hence, superhydrophobic oleophilic composite membranes with a stable separation flux and resistance to fouling can be employed in the field of oil–water separation.Highlights PS/PAN‐PVDF/PDMS@TiO2 composite membrane with multilevel rough structure. PS/PAN‐PVDF/PDMS@TiO2 composite membrane with excellent UV absorption and self‐cleaning ability. PS/PAN‐PVDF/PDMS@TiO2 composite membrane with stable oil–water separation efficiency in harsh environments.

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“…in 2004 and 2011. − To date, intense research has focused on the removal of oil-in-water (O/W) emulsions in domestic and industrial wastewater treatment systems. Filters with desirable pore size and superhydrophilic surfaces were constructed to achieve the goal by blocking the oil droplets while allowing the water phase to permeate through. − Notably, the demand for the removal of water-in-oil (W/O) emulsions has increased rapidly in recent years in fuel purification. , The trace water present in fuels causes microbial growth and corrosion that could further damage the combustion engine. , Previous studies demonstrated that superhydrophobic filters are effective for W/O emulsion separation by allowing the oil phase to pass through while blocking the water droplets. , However, the single function of the filters greatly limited their application in different types of emulsion separation.…”

Section: Introductionmentioning

confidence: 99%

“…15,16 Previous studies demonstrated that superhydrophobic filters are effective for W/O emulsion separation by allowing the oil phase to pass through while blocking the water droplets. 17,18 However, the single function of the filters greatly limited their application in different types of emulsion separation.…”

Section: Introductionmentioning

confidence: 99%

Cross-Linked Cellulose Nanofibril Aerogel with Multiscaled Pores and Dual Wettability for Emulsion Separation

Tang,

Yan,

Tam

2023

ACS Sustainable Chem. Eng.

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Filters with dual wettability are critically needed to meet the demand for both oil-in-water (O/W) and water-in-oil (W/O) emulsion separation. However, the smart filters reported in previous studies are challenged by conditional external stimuli, inadequate sensitivity, and poor scalability. In this study, an aerogel (CPM 600H) with dual wettability under normal condition was developed using superhydrophilic cellulose nanofibrils (CNFs) as the skeleton and dicarboxylated poly(ethylene glycol) as the cross-linker. By tuning the cross-linker length and CNF concentration, a robust aerogel with randomly stacked multiscale pores was obtained. The effect of surfactant types on the aerogel for O/W emulsion separation efficiency was investigated. Results showed that the aerogel exhibited excellent separation efficiency for the anionic surfactant (92.03%) and cationic surfactant (89.50%), but a lower efficiency for the nonionic surfactant (77.38%). The aerogel also demonstrated excellent separation efficiency (>97%) for different W/O emulsions, and it could remove trace amounts of water from diesel, showing potential application in biofuel purification.

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Hierarchical composite membrane with multiscale roughness structures for water-in-oil emulsion separation

Cited by 31 publications

References 46 publications

Dyeable PAN/CuS Nanofiber Membranes with Excellent Mechanical and Photothermal Conversion Properties via Electrospinning

Dyeable PAN/CuS Nanofiber Membranes with Excellent Mechanical and Photothermal Conversion Properties via Electrospinning

Preparation of superhydrophobic membranes with ultraviolet‐absorbing capacity for oil–water separation by electrospinning

Cross-Linked Cellulose Nanofibril Aerogel with Multiscaled Pores and Dual Wettability for Emulsion Separation

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