On demand oil/water separation enabled by microporous ultra-thin aluminum foil with asymmetric wettability

Liu, Junjie; Aday, Xieeryazidan; Wang, Xiaohui; Li, Zhaobo; Liu, Jinxiang

doi:10.1016/j.colsurfa.2022.129334

Cited by 4 publications

(1 citation statement)

References 71 publications

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“…Chemical etching [ 11 ], electrochemical etching [ 12 ], and plasma etching [ 13 ] methods usually employ corrosive media or plasma to unselectively etch the surface of materials, resulting in the formation of hierarchical rough structures on the surface. As far as we know, only ununiform throughout microporous aluminum sheets with intrinsic superwettability have been fabricated via monolithic chemical etching and electrochemical etching [ 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Superhydrophobic Porous Brass by Chemical Dealloying for Efficient Emulsion Separation

Zhou,

Ye,

Han

et al. 2023

Molecules

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By taking advantage of typical dealloying and subsequent aging methods, a novel homogeneous porous brass with a micro/nano hierarchical structure was prepared without any chemical modification. The treatment of commercial brass with hot concentrated HCl solution caused preferential etching of Zn from Cu62Zn38 alloy foil, leaving a microporous skeleton with an average tortuous channel size of 1.6 μm for liquid transfer. After storage in the atmosphere for 7 days, the wettability of the dealloyed brass changed from superhydrophilic to superhydrophobic with a contact angle > 156° and sliding angle < 7°. The aging treatment enhanced the hydrophobicity of the brass by the formation of Cu2O on the surface. By virtue of the opposite wettability to water and oil, the aged brass separated surfactant-stabilized water-in-oil emulsions with separation efficiency of over 99.4% and permeate flux of about 851 L·m−2·h−1 even after recycling for 60 times. After 10 times of tape peeling or sandpaper abrasion, the aged brass maintained its superhydrophobicity, indicating its excellent mechanical stability. Moreover, the aged brass still retained its superhydrophobicity after exposure to high temperatures or corrosive solutions, displaying high resistance to extreme environments. The reason may be that the bicontinuous porous structure throughout the whole foil endows stable mechanical properties to tolerate extreme environments. This method should have a promising future in expanding the applications of alloys.

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Section: Introductionmentioning

confidence: 99%

Fabrication of Superhydrophobic Porous Brass by Chemical Dealloying for Efficient Emulsion Separation

Zhou,

Ye,

Han

et al. 2023

Molecules

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Oil‐Water Separation Performance and Thermoregeneration of a Nanofibrous SiO₂ Membrane Prepared by Sol‐Electrospinning

Meng

Pan

et al. 2023

ChemistrySelect

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The discharge of oily wastewater seriously affects human health and the sustainable development of the ecological environment. Therefore, developing oil‐water separation materials capable of removing organic pollutants is imperative. In this study, we report the preparation of a SiO2 nanofiber membrane based on tetraethyl orthosilicate (TEOS) using a template‐free strategy combined with electrostatic spinning technology. The prepared SiO2 nanofiber membrane was characterized using SEM, EDX, FT‐IR, AFM, XRD, CA, and TG techniques. The prepared SiO2 nanofiber membranes exhibit excellent hydrophilicity (WCA=0°) in air and oleophobicity (UWOCA=136°) underwater, with excellent anti‐pollution properties for gravity‐driven oil‐water separation. The SiO2 nanofiber membrane can effectively separate different kinds of oil‐water mixtures with high water flux (4420 L m−2 h−1) and excellent separation efficiency (99.1 %), with a flux loss of 5.65 % after ten cycles, indicating excellent cycling stability. In addition, it can also be used to separate various oil‐in‐water emulsions stabilized by surfactants with a separation flux higher than 2079 L m−2 h−1 and a separation efficiency maintained at more than 97 %. During the separation of 150 mL lotion, the membrane was seriously scaled due to long‐term pollution. Simple water washing could not restore the membrane flux, and the irreversible scaling rate was 50.74 %, which seriously affected the continuous separation. However, due to the excellent thermal stability of SiO2 nanofiber membranes, oil contaminated membranes can be heated and regenerated, resulting in a flux recovery rate of nearly 100 %. Overall, this material has a wide range of potential applications in environmental protection, especially in the treatment of oily wastewater, due to its simple fabrication method, high flux, and superb oil resistance and recyclability.

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Janus smart materials with asymmetrical wettability for on-demand oil/water separation: a comprehensive review

Gong,

Xiang,

Sun

et al. 2023

J. Mater. Chem. A

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On demand oil/water separation enabled by microporous ultra-thin aluminum foil with asymmetric wettability

Cited by 4 publications

References 71 publications

Fabrication of Superhydrophobic Porous Brass by Chemical Dealloying for Efficient Emulsion Separation

Fabrication of Superhydrophobic Porous Brass by Chemical Dealloying for Efficient Emulsion Separation

Oil‐Water Separation Performance and Thermoregeneration of a Nanofibrous SiO₂ Membrane Prepared by Sol‐Electrospinning

Janus smart materials with asymmetrical wettability for on-demand oil/water separation: a comprehensive review

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On demand oil/water separation enabled by microporous ultra-thin aluminum foil with asymmetric wettability

Cited by 4 publications

References 71 publications

Fabrication of Superhydrophobic Porous Brass by Chemical Dealloying for Efficient Emulsion Separation

Fabrication of Superhydrophobic Porous Brass by Chemical Dealloying for Efficient Emulsion Separation

Oil‐Water Separation Performance and Thermoregeneration of a Nanofibrous SiO2 Membrane Prepared by Sol‐Electrospinning

Janus smart materials with asymmetrical wettability for on-demand oil/water separation: a comprehensive review

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Oil‐Water Separation Performance and Thermoregeneration of a Nanofibrous SiO₂ Membrane Prepared by Sol‐Electrospinning