Sprayed superamphiphilic copper foams for long term recoverable oil-water separation

Zhu, Haiyan; Li, Doudou; Cai, Mingjuan; Yu, Xinquan; Zhang, Youfa

doi:10.1016/j.surfcoat.2017.11.068

Cited by 20 publications

(4 citation statements)

References 54 publications

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“…Given the composition of oil and water, oily wastewater can be simply divided into two group: oil/water mixtures and oil/water emulsions. In recent years, various materials have been fabricated for separation of oil/water mixtures. − In contrast to oil/water mixtures, oil/water emulsions are able to retain a more stable state so that the technologies for their separation, especially for the surfactant-stabilized oil-in-water emulsions, is generally restricted by complex processes and low efficiency. − …”

Section: Introductionmentioning

confidence: 99%

Lotus-Root-like Supermacroporous Cryogels with Superphilicity for Rapid Separation of Oil-in-Water Emulsions

Guo

Yin-ping

Chen

et al. 2019

ACS Appl. Polym. Mater.

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The separation of surfactant-stabilized oil-in-water emulsions is a challenging issue as such state-of-art technologies usually suffer from energy-intensive, time-consuming, and inefficient processes. Here, we constructed a series of superphilic cryogels of regular, ordered, and oriented porous structures that are similar to that of lotus root. Using dimethyl sulfoxide as a solvent and its crystals as porogens, monolithic cryogels were obtained by polymerization of polyethylene glycol diacrylate (PEGDA) embedded with polydivinylbenzene (PDVB) particles at the nondeeply frozen condition. The as-prepared cryogels were of interconnected micrometer-sized porous structure in the range of several micrometers to several tens of micrometers in pore diameter. The pristine polyPEGDA cryogels displayed superphilicity in air, superhydrophilicity under oil, and oleophobicity underwater, and the addition of PDVB particles into the matrix increased the surface roughness and thus led to a higher oleophobicity underwater as well as an enhancement in mechanical strength. The composite cryogels showed a rapid separation of the surfactant-stabilized oil-in-water emulsion with high separation efficacy up to 99.9% driven solely by gravity, and they exhibited a good recyclability after eight time treatments. Owing to the combination of the special interfacial interactions and pore-size effect, the three-dimensional supermacroporous monoliths with superwettability are a potential alternative for separation of oil-in-water emulsion with high separation efficacy and low cost.

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Section: Introductionmentioning

confidence: 99%

Lotus-Root-like Supermacroporous Cryogels with Superphilicity for Rapid Separation of Oil-in-Water Emulsions

Guo

Yin-ping

Chen

et al. 2019

ACS Appl. Polym. Mater.

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“…In Rong et al's study [35], copper foam was immersed in a mixed solution containing (NH4) 2 S 2 O 8 and Na 2 HPO 4 , resulting in the growth of Cu 3 (PO 4 ) 2 •H 2 O nanosheets on the surface. In Zhu et al's study [36], copper foams were coated with a composite material through a spray-on method using hydroxyl-functionalized multi-wall carbon nanotubes and water-based melamine formaldehyde. More complicated methods such as in Liu et al's study [37], who constructed superhydrophobic Janus separation materials using commercially available copper foam and silane agents through a controlled hydrophobic molecular vapor deposition process, are also reported.…”

Section: Introductionmentioning

confidence: 99%

The Roughness Effect on the Preparation of Durable Superhydrophobic Silver-Coated Copper Foam for Efficient Oil/Water Separation

Baxevani,

Stergioudi,

Skolianos

2023

Coatings

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In recent decades, there has been a significant interest in superhydrophobic coatings owing to their exceptional properties. In this research work, a superhydrophobic coating was developed on copper foams with a different roughness via immersion in AgNO3 and stearic acid solutions. The resulting foams exhibited water contact angles of 180°. Notably, surface roughness of the substrate influenced the development of silver dendrites and stearic acid morphologies, leading to different structures on rough and smooth copper foams. Separation efficiency was maintained above 94% for various pollutants, suggesting good stability and durability, irrespective of the substrate’s roughness. Conversely, absorption capacity was influenced by surface roughness of the substrate, with smooth copper foams demonstrating higher absorption values, primarily due to its uniform porosity and microstructure, which allowed for efficient retention of pollutants. Both copper foams exhibited excellent thermal and chemical stability and maintained their hydrophobic properties even after a 40 h exposure to harsh conditions. Mechanical durability of modified copper foams was tested by dragging and in ultrasounds, exhibiting promising results. The samples with the smooth substrate demonstrated improved coating stability.

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“…Zhu et al sprayed a waterborne solution of hydroxyl-functionalized multiwall carbon nanotubes and melamine formaldehyde on copper foams. After that, a superamphiphilic coating was obtained after drying in a vacuum oven at 120 °C . Huang et al.…”

Section: Introductionmentioning

confidence: 99%

“…After that, a superamphiphilic coating was obtained after drying in a vacuum oven at 120 °C. 32 Huang et al prepared a hydrophobic nickel foam by a one-step solution immersion method in a dispersion of octyl group-grafted graphene oxide (GO), which was synthesized using GO and triethoxyoctylsilane by a solvothermal method. 33 The results above are not satisfactory.…”

Section: Introductionmentioning

confidence: 99%

One-Step Preparation of Robust Superhydrophobic Foam for Oil/Water Separation by Pulse Electrodeposition

et al. 2021

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Frequent leakage and pollution of oily wastewater seriously affect the world's ecosystem safety and economic development, which prompts us to urgently develop a highly effective, low-cost, wearresistant, chemically stable, and environmentally friendly new functional material for oil/water separation. In this paper, a robust superhydrophobic material was successfully electrodeposited on the porous copper foam substrates in myristic acid (CH 3 (CH 2 ) 12 COOH) and lanthanum chloride (LaCl 3 •6H 2 O) electrodeposition solution under a continuous pumping circulation and rotation condition. Moreover, SEM, EDS, XRD, FTIR, and XPS technologies were utilized to characterize the surface morphology and chemical composition information. The superhydrophobic property was evaluated by optical contact angle instrument and high-speed camera. It turned out that the micro/nanostructures were mainly composed of lanthanum myristate, and static CA of superhydrophobic copper foam (SCF) was up to 165.2°with SA ≈ 2°. Besides, the SCF exhibited a better performance with good anticorrosion, excellent chemical stability, and outstanding mechanical stability. Furthermore, the SCF can achieve up to 98.6% oil/water separation efficiency. More importantly, by employing this novel processing method, it can effectively save time and provide a promising potential way to make denser and thicker foams for continuous oil/water separation and may be easily applied to other conductive metal matrix materials.

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Sprayed superamphiphilic copper foams for long term recoverable oil-water separation

Cited by 20 publications

References 54 publications

Lotus-Root-like Supermacroporous Cryogels with Superphilicity for Rapid Separation of Oil-in-Water Emulsions

Lotus-Root-like Supermacroporous Cryogels with Superphilicity for Rapid Separation of Oil-in-Water Emulsions

The Roughness Effect on the Preparation of Durable Superhydrophobic Silver-Coated Copper Foam for Efficient Oil/Water Separation

One-Step Preparation of Robust Superhydrophobic Foam for Oil/Water Separation by Pulse Electrodeposition

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