A novel superhydrophilic–underwater superoleophobic Zn-ZnO electrodeposited copper mesh for efficient oil/water separation

You, Qiuying; Ran, Guoxia; Wang, Chan; Zhao, Yuan; Song, Qijun

doi:10.1016/j.seppur.2017.10.055

Cited by 54 publications

(9 citation statements)

References 49 publications

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“…To further investigate the “water removing” performance of the alkali-treated superwettable fabric, the effective separations of the treated fabric for multiple oil/water mixtures were carried out, as shown in Figure S4 Supporting Information. For all of these oil/water mixtures, the flux was ranging from 11 758 to 9243 L·m –2 ·h –1 and the corresponding separation efficiency was kept above than 99.2%, comparable to a series of superwettable membranes, with the wetting property similar to that reported in previous works. , In addition, the cyclic separation of n -hexane/water mixtures was performed to investigate the reusability of the alkali-treated fabric. Similarly, the superwettable fabric was cleaned with alkaline water solution and dried up after each separation experiment to remove the water film on the fabric surface.…”

Section: Resultssupporting

confidence: 70%

Functionalized Superwettable Fabric with Switchable Wettability for Efficient Oily Wastewater Purification, in Situ Chemical Reaction System Separation, and Photocatalysis Degradation

Wang

et al. 2019

ACS Appl. Mater. Interfaces

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In view of the increasing serious water environmental and human health issues caused by oily wastewater, functional superwetting materials with controllable wettability, high durability, and scale preparation methods are highly desired for efficient oil/water separation. In this respect, a pH-responsive multifunctional fabric with switchable surface wettability, favorable mechanical durability, and self-repairing property has been developed via decorating the modified TiO2 nanoparticles of special surface compositions onto the fabric surface. By virtue of the intelligent surface wettability, the resulted superwettable fabric can be used for controllable separation of multiple oil/water mixtures, particularly the complicated oil/water/oil ternary mixtures, showing excellent separation efficiency and high filtration flux even under extreme pH conditions, which is comparable to most of the commercial and currently reported functionalized membranes. Simultaneously, the negative pressure-driven, continuous, high-speed, and highly efficient in situ purification of large volumes of oily wastewater is successfully achieved based on the resulted superwettable fabric. More importantly, with the as-prepared superwettable fabric as the filtration membrane, the continuous in situ separation of the synthetic oily product from the corresponding chemical reaction systems is well performed without interruption of the reaction, demonstrating outstanding merits of simplifying procedures, saving operation time, and increasing product yield. In addition, it is worth noting that the alkali-treated superhydrophilic fabric presents superior photocatalysis self-cleaning performance for various water-soluble organic pollutants. These unique advantages of the functionalized smart superwettable fabric ensure that it can be competent in multifarious relevant challenging settings, indicating a broad prospect for diverse practical applications, especially the oily wastewater treatment and multiple industrial operation optimizations.

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Section: Resultssupporting

confidence: 70%

Functionalized Superwettable Fabric with Switchable Wettability for Efficient Oily Wastewater Purification, in Situ Chemical Reaction System Separation, and Photocatalysis Degradation

Wang

et al. 2019

ACS Appl. Mater. Interfaces

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“…As a polar crystal, ZnO (0001) exhibited a positive charge on the crystalline surface and attracted OH − ions and Zn(OH) 4 2− ions in the solution. As a result, ZnO had the highest growth rate along the C-axis compared to other crystal planes and eventually forms ZnO nanostructures [ 37 , 38 , 39 , 40 ]. The overall chemical reactions were presented as follows: C 6 H 12 N 4 + 6H 2 O → 6HCHO + 4NH 3 NH 3 + H 2 O → NH 4 + + OH − Zn 2+ + 2OH − → ZnO(s) + H 2 O …”

Section: Resultsmentioning

confidence: 99%

Wettability Improvement in Oil–Water Separation by Nano-Pillar ZnO Texturing

et al. 2022

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The nanostructure-based surface texturing can be used to improve the materials wettability. Regarding oil–water separation, designing a surface with special wettability is as an important approach to improve the separation efficiency. Herein, a ZnO nanostructure was prepared by a two-step process for sol–gel process and crystal growth from the liquid phase to achieve both a superhydrophobicity in oil and a superoleophobic property in water. It is found that the filter material with nanostructures presented an excellent wettability. ZnO-coated stainless-steel metal fiber felt had a static underwater oil contact angle of 151.4° ± 0.8° and an underoil water contact angle of 152.7° ± 0.6°. Furthermore, to achieve water/oil separation, the emulsified impurities in both water-in-oil and oil-in-water emulsion were effectively intercepted. Our filter materials with a small pore (~5 μm diameter) could separate diverse water-in-oil and oil-in-water emulsions with a high efficiency (>98%). Finally, the efficacy of filtering quantity on separation performance was also investigated. Our preliminary results showed that the filtration flux decreased with the collection of emulsified impurities. However, the filtration flux could restore after cleaning and drying, suggesting the recyclable nature of our method. Our nanostructured filter material is a promising candidate for both water-in-oil and oil-in-water separation in industry.

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“…Adsorbent materials such as biomass carbon aerogels and polymer foams, which are mainly applicable to the adsorption of floating oil on water, need a lot of manpower or extra power in the process of separating oil and water mixtures. − In recent years, membrane separation materials have been applied for oil–water separation due to their high efficiency and environmental friendliness. A series of superwetting membranes for the separation of oil–water mixtures have been developed, including hydrophilic and lipophilic separation membranes. − For example, superhydrophobic surfaces have been constructed on metal mesh, − nonwoven fabric, or filter paper for oil–water separation. − The superhydrophobic membrane can be infiltrated by underwater oil to achieve oil separation, which is suitable for the separation of oil–water mixtures with low viscosities and high oil contents. − However, the superhydrophilic (underwater superoleophobic) membrane is suitable for the separation of oil–water mixtures with high or low viscosities and low oil contents. The superhydrophilic (underwater superoleophobic) membrane can reduce the contact between high-viscosity oil and the membranes and reduce the possibility of membrane pore blockage; it has a good service life and recyclability. − Both superhydrophobic materials and superhydrophilic materials offer specific advantages in the field of oil–water separation.…”

Section: Introductionmentioning

confidence: 99%

Superhydrophilic Sandwich Structure Aerogel Membrane for Emulsion Separation and Heavy Metal Ion Removal

Zhang

et al. 2021

ACS Appl. Polym. Mater.

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Water pollution has been increasingly becoming a serious environmental and health challenge in recent years. This is compounded by the often coexisting oil pollution and heavy metal pollution. It is of great practical significance to develop materials that can simultaneously deal with these two kinds of water pollution problems. In this study, a simple and green approach is proposed for preparing matrix-free citric acid modified alginate-based aerogel membrane by simple sol spraying, chemical cross-linking, and freeze-drying methods. The aerogel membrane with dense upper and lower surfaces and a loose interlayer possesses the properties of superhydrophilicity and underwater superoleophobic and strong antiadhesion performances, and it can realize the separation of highly viscous miscible oil–water emulsions with a separation efficiency of over 99.5%, even in corrosive and high-salt environments. The membrane has shown strong stability during 3000 min of uninterrupted cross-flow filtration of emulsion, which reflects the good long-term separation performance of the membrane. The prepared membrane can also be used for the removal of various heavy metal ions from water under gravity, with a removal efficiency >99% and an adsorption capacity of about 240 mg/g for Pb2+. The modified membrane which features low cost, a simple and green preparation process, excellent oil–water separation, and heavy metal removal capabilities possesses great application potential in the treatment of polluted water.

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A novel superhydrophilic–underwater superoleophobic Zn-ZnO electrodeposited copper mesh for efficient oil/water separation

Cited by 54 publications

References 49 publications

Functionalized Superwettable Fabric with Switchable Wettability for Efficient Oily Wastewater Purification, in Situ Chemical Reaction System Separation, and Photocatalysis Degradation

Functionalized Superwettable Fabric with Switchable Wettability for Efficient Oily Wastewater Purification, in Situ Chemical Reaction System Separation, and Photocatalysis Degradation

Wettability Improvement in Oil–Water Separation by Nano-Pillar ZnO Texturing

Superhydrophilic Sandwich Structure Aerogel Membrane for Emulsion Separation and Heavy Metal Ion Removal

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