Attapulgite-based nanofiber membrane with oriented channels for high-efficiency oil-water separation

Mao, Hengyang; Xu, Peng; Zhou, Shouyong; Fan, Zhaoru; Xue, Ailian; Li, Meisheng; Zhao, Yijiang; Wang, Aiqin; Wu, Zhentao; Fan, Yiqun

doi:10.1016/j.memsci.2023.121811

Cited by 9 publications

(2 citation statements)

References 51 publications

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“…The compromise of permeability and selectivity is a central paradigm in gills by which the gill filaments perform rapid intake of oxygen (O 2 ) and rejection of carbon dioxide (CO 2 ) in a benign physiological environment. Such a natural sieving principle is a prime source of inspiration for many biomimetic separation systems. , Enlightened by this, to obtain high exclusion of cadmium ions (Cd 2+ ) but fast transport of acid ion (H + ), we introduced filament-like attapulgites (ATPs) with a high aspect ratio to the RP dispersion (Figure a) to reduce the stacking density of the building blocks constructing the DD membranes under vacuum filtration (Figure b). − The acid environment ionized the amino moieties of RPs with electropositivity, while ATPs increased the specific area of RPs, thereby electrostatically rejecting Cd 2+ but expelling more diffusive H + , which mimicked the art of gills with gill arches enlarging the specific areas of gill filaments arresting O 2 but expelling CO 2 (Figure d). Ultimately, the recovered acid solution from DD can be used for the repeated treatment of Cd-contaminated crops (Figure c).…”

Section: Introductionmentioning

confidence: 99%

Biomimetic Nanocomposite Membranes for Efficient Acid Recovery from Cadmium Effluents

Yu,

Li,

Mao

et al. 2024

ACS EST Water

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The compromise of permeability and selectivity is a central paradigm in gills by which the gill filaments perform rapid intake of oxygen (O 2 ) and rejection of carbon dioxide (CO 2 ) in a benign physiological environment. Such an efficient separation in nature is a key dogma in designing biomimetic separation systems, yet the fundamental challenge of the permeability−selectivity trade-off still remains a nascence. In this study, we report a gill-inspired diffusion dialysis membrane for acid recovery from heavy metal wastewater with a high permeation efficiency of acid ions (H + ) and robust rejection of cadmium ions (Cd 2+ ) plus stable performances against repeated separations. This membrane was fabricated by vacuum filtration of a nanocomposite regime featuring natural protein nanoparticles attached to the rod-shaped attapulgites. The stacking of such anisotropic building blocks endowed the membranes with capacious channels for H + transport, while the electropositivity of proteins enabled robust rejection of Cd 2+ . The enhanced separation performance of this membrane mimicked the art of gills with gill arches, enlarging the specific area of gill filaments arresting O 2 but expelling CO 2 . As a result, the membrane exhibited a high H + dialysis coefficient (0.049 m•h −1 ) and H + /Cd 2+ selectivity (S H/Cd = 23.3) with excellent long-term operational stability and general applicability (S H/Cu = 26.3, S H/Pb = 18.1, S H/Ca = 23.3, and S H/Mg = 18.6) suitable for practical applications.

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Section: Introductionmentioning

confidence: 99%

Biomimetic Nanocomposite Membranes for Efficient Acid Recovery from Cadmium Effluents

Yu,

Li,

Mao

et al. 2024

ACS EST Water

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“…It provides a fast and efficient path for oil-water separation. More importantly, it is noteworthy that by fabricating nanofiber membranes with directional channels and low tortuousness, comparing them with nanofiber membranes with nondirectional channels, and performing molecular dynamics simulations, Mao et al124 finally proposed and revealed the important effect of the directional channel aperture on the membrane flux. This report provides new avenues and good theoretical support for future research on the flux of oil/water separation membrane.…”

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confidence: 99%

Bionic multifunctional fibrous materials for efficient oil/water separation

Guo

Liu

2023

Droplet

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Special wettability fibrous materials have received a lot of attention because of their good connectivity, mechanical flexibility, large specific surface area, and ease of shape manipulation. Their outstanding performance paves the way toward efficient oil/water separation in a variety of environments and for separation requirements. This paper discusses the distinct advantages, challenges, and future research directions of various substrates for fibrous materials, such as nonwoven natural biomass fibers, fabrics, electrospinning fibers, metallic fibers, and inorganic nonmetallic fibers. The special wettability fibrous filter materials and fibrous adsorbents are summarized based on the different separation methods.The principles of preparation of various special wettabilities are introduced, and the unique advantages of fibrous adsorbents are emphasized. The preparation strategy of fibrous filter materials is discussed, as well as some representative work and research progress. The benefits, drawbacks, and research directions in terms of various materials are examined. This article emphasizes the pollution resistance of fibrous filter materials and the elasticity of fibrous adsorbents. Finally, the prospects in terms of the problems, challenges, and future development of special wettability fibrous materials used in oil/water separation are discussed.

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Enhancing the strength and toughness of polylactic acid through fused deposition modeling‐induced orientation and nucleation effects of attapulgite

Ni,

Gao,

Hao

et al. 2024

J of Applied Polymer Sci

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Simultaneously enhancing strength and toughness through simple and low‐cost methods has always been a challenge for polylactic acid (PLA) materials. In this context, natural attapulgite (ATT) nanorods were used as fillers combined with fused deposition modeling (FDM) to improve the strength and toughness of PLA. The printable PLA nanocomposite filaments filled with ATT nanorods were prepared by melting compounding and smoothly printed via a commercial FDM three‐dimensional (3D) printer. The influences of FDM process and ATT filling on the properties of PLA/ATT composite parts were evaluated through microstructure analysis, rheological, and mechanical tests. The results suggest that PLA/ATT composite parts manufactured by FDM exhibit superior mechanical properties, which can be attributed to the FDM induced orientation and nucleation effect of ATT nanorods. The tensile strength can reach 56 MPa with the addition of 2 wt% ATT at a nozzle temperature of 205°C, increasing by 24% compared to pure PLA. In addition, the fracture elongation of PLA/ATT parts printed by FDM has significantly increased to 26%, which is 924% higher than pure PLA. Furthermore, the filling of ATT significantly improves the storage modulus of composite parts. This work provides a new high‐strength, ultra tough, low‐cost, and printing stable PLA/ATT composite material and forming method, offering a promising avenue for the wider application of PLA and ATT in the future.

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Attapulgite-based nanofiber membrane with oriented channels for high-efficiency oil-water separation

Cited by 9 publications

References 51 publications

Biomimetic Nanocomposite Membranes for Efficient Acid Recovery from Cadmium Effluents

Biomimetic Nanocomposite Membranes for Efficient Acid Recovery from Cadmium Effluents

Bionic multifunctional fibrous materials for efficient oil/water separation

Enhancing the strength and toughness of polylactic acid through fused deposition modeling‐induced orientation and nucleation effects of attapulgite

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