Calcium ions enhanced mussel-inspired underwater superoleophobic coating with superior mechanical stability and hot water repellence for efficient oil/water separation

AbstractReckless discharge of industrial wastewater and domestic sewage as well as frequent leakage of crude oil have caused serious environmental problems and posed severe threat to human survival. Various nature inspired superhy-drophobic surfaces have been successfully applied in oily water remediation. However, further improvements are still urgently needed for practical application in terms of facile synthesis process and long-term durability towards harsh environment. Herein, we propose a simple one-step dodecyl mercaptan functionalization method to fabricate Super-hydrophobic-Superoleophilic Copper Mesh (SSCM). The prepared SSCM possesses excellent water repellence and oil affinity, enabling it to successfully separate various oil-water mixtures with high separation efficiency (e.g., > 99% for hexadecane-water mixture). The SSCM retains high separating ability when hot water and strong corrosive aqueous solutions are used to simulate oil-water mixtures, indicating remarkable chemical durability of the dodecyl mercaptan functionalized copper mesh. Additionally, the efficiency can be well maintained during 50 cycles of separation, and the water repellence is even stable after storage in air for 120 days, demonstrating the reusability and long-term stability of the SSCM. Furthermore, the functionalized mesh also shows good mechanical robustness towards abrasion by sandpaper, and oil-water separation efficiency of > 96% can be obtained after 10 cycles of abrasion. The reported one-step dodecyl mercaptan functionalization could be a simple method for increasing the water repellence of copper mesh, and thereby be a great candidate for treating large-scale oily wastewater in harsh environments.

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Facile Fabrication of Magnetic, Durable and Superhydrophobic Cotton for Efficient Oil/Water Separation

Polymers ◽

10.3390/polym11030442 ◽

2019 ◽

Vol 11 (3) ◽

pp. 442 ◽

Cited By ~ 4

Author(s):

Mingguang Yu ◽

Qing Wang ◽

Wenxin Yang ◽

Yonghang Xu ◽

Min Zhang ◽

...

Keyword(s):

Separation Efficiency ◽

Water Repellency ◽

Cotton Fabrics ◽

Ammonia Solution ◽

Hot Water ◽

Water Contact ◽

Water Separation ◽

Efficient Strategy ◽

Oil Water Separation ◽

Oil Water

In this paper, we present a facile and efficient strategy for the fabrication of magnetic, durable, and superhydrophobic cotton for oil/water separation. The superhydrophobic cotton functionalized with Fe3O4 magnetic nanoparticles was prepared via the in situ coprecipitation of Fe2+/Fe3+ ions under ammonia solution on cotton fabrics using polyvinylpyrrolidone (PVP) as a coupling agent and hydrophobic treatment with tridecafluorooctyl triethoxysilane (FAS) in sequence. The as-prepared cotton demonstrated excellent superhydrophobicity with a water contact angle of 155.6° ± 1.2° and good magnetic responsiveness. Under the control of the external magnetic field, the cotton fabrics could be easily controlled to absorb the oil from water as oil absorbents, showing high oil/water separation efficiency, even in hot water. Moreover, the cotton demonstrated remarkable mechanical durable properties, being strongly friction-resistant against sandpaper and finger wipe, while maintaining its water repellency. This study developed a novel and efficient strategy for the construction of magnetic, durable, and superhydrophobic biomass-based adsorbent for oil/water separation, which can be easily scaled up for practical oil absorption.

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Superhydrophobic meshes that can repel hot water and strong corrosive liquids used for efficient gravity-driven oil/water separation

Nanoscale ◽

10.1039/c6nr01298a ◽

2016 ◽

Vol 8 (14) ◽

pp. 7638-7645 ◽

Cited By ~ 268

Author(s):

Jian Li ◽

Ruimei Kang ◽

Xiaohua Tang ◽

Houde She ◽

Yaoxia Yang ◽

...

Keyword(s):

Hot Water ◽

Water Separation ◽

Oil Water Separation ◽

Gravity Driven ◽

Oil Water

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Hot water-repellent and mechanically durable superhydrophobic mesh for oil/water separation

Journal of Colloid and Interface Science ◽

10.1016/j.jcis.2017.10.059 ◽

2018 ◽

Vol 512 ◽

pp. 567-574 ◽

Cited By ~ 37

Author(s):

Min Cao ◽

Xiaomin Luo ◽

Huijun Ren ◽

Jianyan Feng

Keyword(s):

Hot Water ◽

Water Repellent ◽

Water Separation ◽

Oil Water Separation ◽

Oil Water

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One-Step Synthesis of Environmentally Friendly Superhydrophilic and Superhydrophobic Sponges for Oil/Water Separation

Materials ◽

10.3390/ma12071182 ◽

2019 ◽

Vol 12 (7) ◽

pp. 1182 ◽

Cited By ~ 5

Author(s):

Yo Seph Lee ◽

Yong Taek Lim ◽

Won San Choi

Keyword(s):

Calcium Carbonate ◽

Mechanical Stability ◽

Environmentally Friendly ◽

Absorption Capacity ◽

Melamine Formaldehyde ◽

Water Separation ◽

Stability Tests ◽

Oil Water Separation ◽

One Step ◽

Oil Water

Environmentally friendly superhydrophilic and superhydrophobic sponges were synthesized using a one-step approach for oil/water separation. A superhydrophilic or superhydrophobic sponge (MFS/CC-DKGM or MFS/CC-PDMS) was synthesized by one-step coating of melamine formaldehyde sponge (MFS) with a mixture of calcium carbonate (CC) rods and deacetylized Konjac glucomannan (DKGM) [or polydimethylsiloxane (PDMS)]. The MFS/CC-PDMS showed excellent absorption capacity, which reached 52–76 g/g following immersion into various types of oil/water mixtures. Furthermore, the MFS/CC-DKGM and MFS/CC-PDMS exhibited excellent water- and oil-flux performances, which reached 4,702 L/m2 h and 19,591 L/m2 h, respectively, when they were used as filters. The MFS/CC-DKGM and MFS/CC-PDMS maintained their wettability characteristics relatively well after the chemical, thermal, and mechanical stability tests.

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Poly(dimethylsiloxane)/graphene oxide composite sponge: a robust and reusable adsorbent for efficient oil/water separation

Soft Matter ◽

10.1039/c9sm01984g ◽

2019 ◽

Vol 15 (45) ◽

pp. 9224-9232 ◽

Cited By ~ 5

Author(s):

Jiajun Zhao ◽

Hongyun Chen ◽

Huijian Ye ◽

Bingpan Zhang ◽

Lixin Xu

Keyword(s):

Graphene Oxide ◽

Adsorption Capacity ◽

Mechanical Stability ◽

Polluted Water ◽

Effective Strategy ◽

Water Separation ◽

Oxide Composite ◽

Oil Water Separation ◽

Oil Water

The development of polymer sponges with large adsorption capacity, high oil/water selectivity and mechanical stability is an effective strategy for the separation of oil from oil-polluted water.

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Robust superhydrophobic candle soot and silica composite sponges for efficient oil/water separation in corrosive and hot water

Journal of Sol-Gel Science and Technology ◽

10.1007/s10971-017-4350-y ◽

2017 ◽

Vol 82 (3) ◽

pp. 817-826 ◽

Cited By ~ 15

Author(s):

Jian Li ◽

Zhihong Zhao ◽

Ruimei Kang ◽

Yan Zhang ◽

Weizhong Lv ◽

...

Keyword(s):

Hot Water ◽

Water Separation ◽

Candle Soot ◽

Silica Composite ◽

Oil Water Separation ◽

Oil Water

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Fabrication of durable superhydrophobic/oleophilic cotton fabric for highly efficient oil/water separation

Water Science & Technology ◽

10.2166/wst.2020.562 ◽

2020 ◽

Author(s):

M. E. Mohamed ◽

B. A. Abd-El-Nabey

Keyword(s):

Cotton Fabric ◽

Mechanical Stability ◽

Separation Efficiency ◽

Silicone Oil ◽

Absorption Capacity ◽

Water Contact ◽

Water Separation ◽

Coating Method ◽

Oil Water Separation ◽

Oil Water

Abstract In the present work, dopamine is self-polymerized on cotton fabric by a simple deep-coating method and followed by modification with an ethanolic solution of palmitic acid: a superhydrophobic/oleophilic cotton fabric was obtained. The as-prepared cotton fabric exhibits a superhydrophobic character with a water contact angle of 157o. The absorption capacity of as-prepared superhydrophobic/oleophilic cotton fabric in n-hexane, petroleum ether, and silicone oil was determined. The results show that silicone oil has the highest absorption capacity while n-hexane has the lowest value. The absorption capacity is nearly constant even after ten cycles, indicating the efficient recyclability of the as-prepared superhydrophobic/oleophilic cotton fabric for oil separation. The as-prepared superhydrophobic/oleophilic cotton fabric shows excellent separation efficiency, high flux rate, and excellent chemical and mechanical stability.

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Superwetting Polymeric Three Dimensional (3D) Porous Materials for Oil/Water Separation: A Review

Polymers ◽

10.3390/polym11050806 ◽

2019 ◽

Vol 11 (5) ◽

pp. 806 ◽

Cited By ~ 21

Author(s):

Yihao Guan ◽

Fangqin Cheng ◽

Zihe Pan

Keyword(s):

Porous Materials ◽

Oil Spills ◽

Mechanical Stability ◽

Separation Efficiency ◽

Three Dimensional ◽

High Porosity ◽

Water Separation ◽

Term Operation ◽

Oil Water Separation ◽

Oil Water

Oil spills and the emission of oily wastewater have triggered serious water pollution and environment problems. Effectively separating oil and water is a world-wide challenge and extensive efforts have been made to solve this issue. Interfacial super-wetting separation materials e.g., sponge, foams, and aerogels with high porosity tunable pore structures, are regarded as effective media to selectively remove oil and water. This review article reports the latest progress of polymeric three dimensional porous materials (3D-PMs) with super wettability to separate oil/water mixtures. The theories on developing super-wetting porous surfaces and the effects of wettability on oil/water separation have been discussed. The typical 3D porous structures (e.g., sponge, foam, and aerogel), commonly used polymers, and the most reported techniques involved in developing desired porous networks have been reviewed. The performances of 3D-PMs such as oil/water separation efficiency, elasticity, and mechanical stability are discussed. Additionally, the current challenges in the fabrication and long-term operation of super-wetting 3D-PMs in oil/water separation have also been introduced.

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