Laser-Heat Surface Treatment of Superwetting Copper Foam for Efficient Oil–Water Separation

Wang, Qinghua; Liu, Chao; Wang, Huixin; Yin, Kai; Yu, Zhenhai; Wang, Taiyuan; Ye, Mengqi; Pei, Xianjun; Liu, Xiaochao

doi:10.3390/nano13040736

Cited by 5 publications

(2 citation statements)

References 49 publications

(62 reference statements)

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“…Three mechanisms have been proposed by others, such as the decomposition of carbon dioxide into carbon with active magnetite [ 52 ], adsorption of hydrophobic organic matter from the atmosphere [ 53 , 54 , 55 ], and creation of hydrophobic groups [ 56 ] to explain the wettability transition from superhydrophilicity to hydrophobicity. In our case, there is no energy accountable for the creation of an active magnetite to catalyze the decomposition of carbon dioxide into carbon.…”

Section: Resultsmentioning

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: Resultsmentioning

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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“…Stationary wettability-regulated materials usually require ex situ multistep treatments or devices for achieving highly efficient separation. Stimulus-responsive separation membranes can effectively prevent oil contamination and achieve continuous on-demand oil/water separation by changing the membrane surface wettability under external stimuli (e.g., pH, , light, − temperature, − electricity, , magnetism, − and pressure , ). Stimulus-responsive hydrogels also exhibit superiority toward complex wastewater (such as multiphase heavy oil/water/light oil mixtures). − Polymer hydrogels are hydrophilic polymer networks infiltrated by water, and the porous network structure allows water molecules to permeate. , However, increasing the thickness of the hydrogel layer may reduce the membrane’s separation flux.…”

Section: Introductionmentioning

confidence: 99%

Separation and Photodegradation of Dye-Containing Oil/Water Mixtures with a Photothermally Responsive PNIPAm-MXene/PAN-PNIPAm Nanofibrous Hydrogel Membrane

Huang,

Wen,

Huang

et al. 2024

ACS Appl. Nano Mater.

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Although several separation membranes for the purification of dye-containing oily wastewater have been reported, achieving continuous onestep separation and photodegradation of complex oil/water effluents containing dyes is still a significant challenge. In previous studies, the purification of oil/ water mixtures has typically involved a two-step process involving the initial separation of oil/water mixtures followed by the subsequent photodegradation of organic dyes. This is because one-step purification requires the membrane to concurrently possess an excellent separation efficiency and photodegradation ability to ensure efficient degradation of dyes as they rapidly pass through the separation membrane. Herein, we propose a photothermally responsive poly(Nisopropylacrylamide)-MXene/polyacrylonitrile-poly(N-isopropylacrylamide) nanofibrous hydrogel membrane (PNIPAm-MXene/PAN-PNIPAm, PMPP membrane). The PMPP membrane is composed of a PNIPAm-MXene hydrogel bonded to the surface of a PAN-PNIPAm nanofibrous membrane. The PNIPAm-MXene hydrogel layer imparts excellent photothermally responsive wettability, photodegradation activity, and antifouling properties to the membrane. The PAN-PNIPAm nanofibrous membrane provides a porous structure that ensures the highly efficient separation of complex oil/water mixtures. The PMPP membrane achieves simultaneous one-step separation and photodegradation of complex oil/water effluents under light irradiation, particularly in the case of multiphase heavy oil/water/light oil mixtures containing both oily and water-soluble organic dyes and oil−water emulsions. The degradation and separation efficiencies of the PMPP membrane exceed 99.5%. Even after 20 cycles, the degradation rates of Sudan IV and methyl blue (MB) remain above 95.7 and 99.9%, respectively.

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Fabrication and capillary performance of multi-scale microgroove ceramic wicks via nanosecond laser irradiation for ultrathin ceramic heat pipes

Yuan,

Yan,

Huang

et al. 2024

Applied Thermal Engineering

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Laser-Heat Surface Treatment of Superwetting Copper Foam for Efficient Oil–Water Separation

Cited by 5 publications

References 49 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

Separation and Photodegradation of Dye-Containing Oil/Water Mixtures with a Photothermally Responsive PNIPAm-MXene/PAN-PNIPAm Nanofibrous Hydrogel Membrane

Fabrication and capillary performance of multi-scale microgroove ceramic wicks via nanosecond laser irradiation for ultrathin ceramic heat pipes

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