Efficient Oil-Water Separation Coating With Robust Superhydrophobicity and High Transparency

Abstract There has been a growing interest in oil-water separation due to the massive economic and energy loss caused by world-wide oil spill. In the past decades, a new type of superhydrophobic surface has been developed for the efficient oil-water separation, but its large-scale use is significantly limited by its expensive, sophisticated, and fragile roughness structure. Meanwhile, to handle complex operating conditions, the transparency of the superhydrophobic surface has been more attractive due to its potential visual oil-water separation and optical applications. Herein, we showed a simple and versatile strategy to fabricate superhydrophobic coating with robustness and high transparency. Subsequently, this multifunctional superhydrophobic coating was utilized for oil-water separation and indicated excellent separation efficiency. In this strategy, candle soot composed of carbon nanoparticles was deposited onto the substrate and used as a rough surface template. Then, a filmy and hard silica shell was modified onto this template via chemical vapor deposition to reinforce the roughness structure. Following, this soot-silica coated substrate was calcined in air to remove the candle soot template. Finally, based on a rational surface design, this robust silica coating achieved excellent superhydrophobicity thereby showing inherently oil-water separation benefits. This reinforced superhydrophobic coating presented robust superhydrophobicity even after 410 s sand impacting with the height of 40 cm. Also, it retained excellent oil-water separation efficiency even after reuses.

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Fabricated of Superhydrophobic Silanized Melamine Sponge with Photochromic Properties for Efficiency Oil/Water Separation

Advances in Polymer Technology ◽

10.1155/2019/9536320 ◽

2019 ◽

Vol 2019 ◽

pp. 1-8 ◽

Cited By ~ 2

Author(s):

Peng Hong ◽

Zhu Liu ◽

Yang Gao ◽

Yubin Chen ◽

Mingxun Zhuang ◽

...

Keyword(s):

Large Scale ◽

Separation Efficiency ◽

Low Cost ◽

Water Repellency ◽

Dip Coating ◽

Absorption Capacity ◽

Photochromic Properties ◽

Water Separation ◽

Oil Water Separation ◽

Oil Water

Superhydrophobic sponge as potential absorbing material for oil/water separation is attracting great attention recently. However, there are still some challenges to feasibly fabricate superhydrophobic sponge with large scale and low cost. Herein, a novel photochromic superhydrophobic melamine sponge (PDMS-SP sponge) is fabricated by facilely dip-coating and thermocuring of hydroxyl-terminated polydimethylsiloxanes mixed with photochromic spiropyran. FT-IR, EDS, and XPS results confirm the successful coating of PDMS-SP upon melamine sponge. The resultant sponge not only possesses excellent water repellency with a contact angle of 154.5° and oil-water separation efficiency with an oil absorption capacity of 48–116 folds of itself weight, but also shows photochromic phenomenon between colorless and purple when it is successively exposed to UV irradiation and visible light.

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Fabrication of zirconia based durable superhydrophobic–superoleophilic fabrics using non fluorinated materials for oil–water separation and water purification

RSC Advances ◽

10.1039/c6ra24460b ◽

2016 ◽

Vol 6 (105) ◽

pp. 103632-103640 ◽

Cited By ~ 24

Author(s):

Arun K. Singh ◽

Jayant K. Singh

Keyword(s):

Water Purification ◽

Separation Efficiency ◽

Dip Coating ◽

Superhydrophobic Coating ◽

Water Separation ◽

Coated Fabric ◽

Coating Method ◽

Oil Water Separation ◽

Oil Water ◽

Dip Coating Method

Fluorine free superhydrophobic coating on cotton fabric by inexpensive dip coating method. The coated fabric exhibited high oil–water separation efficiency.

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Simulation of Multiphase Flow of the Oil-Water Separation in a Rotating Packed Bed for Oil Purification

Mathematical Problems in Engineering ◽

10.1155/2013/404327 ◽

2013 ◽

Vol 2013 ◽

pp. 1-9 ◽

Cited By ~ 1

Author(s):

Xiaojun Zhang ◽

Yun Cheng ◽

Songlin Nie ◽

Hui Ji ◽

Laiguo Liu

Keyword(s):

Multiphase Flow ◽

Separation Efficiency ◽

Rotation Axis ◽

Packed Bed ◽

Lower Surface ◽

Operating Conditions ◽

Water Separation ◽

Rotating Packed Bed ◽

Oil Water Separation ◽

Oil Water

HIGEE (High Gravity Rotary Device) rotating oil purifier which consists of two parts: hydrocyclone separator and rotating packed bed (abbr. RPB) is considered to be capable of removing the solid particle contaminant, moisture and gas simultaneously. As the major unit of HIGEE, the RPB uses centrifugal force to intensify mass transfer. Because of the special structure of RPB, the hydraulic characteristics of the RPB are very important. In this study, the multiphase flow model in porous media of the RPB is presented, and the dynamical oil-water separation in the RPB is simulated using a commercial computational fluid dynamics code. The operating conditions and configuration on the hydraulic performance of the RPB are investigated. The results have indicated that the separation efficiency of HIGEE rotating oil purifier is predominantly affected by operating conditions and the configurations. The best inlet pressure is 0.002 MPa. When the liquid inlet is placed in the outside of the lower surface of RPB; oil outlet is placed in the upper surface, where it is near the rotation axis; and water outlet is placed in the middle of the RPB, where it is far away from the oil outlet, the separating efficiency is the best.

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Fabrication of stable superhydrophobic coating on fabric with mechanical durability, UV resistance and high oil-water separation efficiency

Surface and Coatings Technology ◽

10.1016/j.surfcoat.2018.12.094 ◽

2019 ◽

Vol 360 ◽

pp. 318-328 ◽

Cited By ~ 20

Author(s):

Guangming Pan ◽

Xinyan Xiao ◽

Zhihao Ye

Keyword(s):

Separation Efficiency ◽

Uv Resistance ◽

Superhydrophobic Coating ◽

Water Separation ◽

Mechanical Durability ◽

Oil Water Separation ◽

Oil Water

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Carbon Nanotubes and Polydopamine Modified Poly(dimethylsiloxane) Sponges for Efficient Oil–Water Separation

Materials ◽

10.3390/ma14092431 ◽

2021 ◽

Vol 14 (9) ◽

pp. 2431

Author(s):

Wen Zhang ◽

Juanjuan Wang ◽

Xue Han ◽

Lele Li ◽

Enping Liu ◽

...

Keyword(s):

Carbon Nanotubes ◽

Large Scale ◽

Absorption Capacity ◽

Potential Candidate ◽

Hard Template ◽

Water Separation ◽

Industrial Oil ◽

The Matrix ◽

Oil Water Separation ◽

Oil Water

In this paper, effective separation of oil from both immiscible oil–water mixtures and oil-in-water (O/W) emulsions are achieved by using poly(dimethylsiloxane)-based (PDMS-based) composite sponges. A modified hard template method using citric acid monohydrate as the hard template and dissolving it in ethanol is proposed to prepare PDMS sponge composited with carbon nanotubes (CNTs) both in the matrix and the surface. The introduction of CNTs endows the composite sponge with enhanced comprehensive properties including hydrophobicity, absorption capacity, and mechanical strength than the pure PDMS. We demonstrate the successful application of CNT-PDMS composite in efficient removal of oil from immiscible oil–water mixtures within not only a bath absorption, but also continuous separation for both static and turbulent flow conditions. This notable characteristic of the CNT-PDMS sponge enables it as a potential candidate for large-scale industrial oil–water separation. Furthermore, a polydopamine (PDA) modified CNT-PDMS is developed here, which firstly realizes the separation of O/W emulsion without continuous squeezing of the sponge. The combined superhydrophilic and superoleophilic property of PDA/CNT-PDMS is assumed to be critical in the spontaneously demulsification process.

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Dodecyl Mercaptan Functionalized Copper Mesh for Water Repellence and Oil-water Separation

Journal of Bionic Engineering ◽

10.1007/s42235-021-0062-7 ◽

2021 ◽

Vol 18 (4) ◽

pp. 887-899

Author(s):

Yanling Tian ◽

Jiekai Feng ◽

Zexin Cai ◽

Jiaqi Chao ◽

Dawei Zhang ◽

...

Keyword(s):

Separation Efficiency ◽

Synthesis Process ◽

Water Separation ◽

Oil Water Separation ◽

One Step ◽

Oil Water ◽

Water Repellence ◽

Copper Mesh ◽

Dodecyl Mercaptan

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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Rational design of multi-layered superhydrophobic coating on cotton fabrics for UV shielding, self-cleaning and oil-water separation

Materials & Design ◽

10.1016/j.matdes.2017.08.071 ◽

2017 ◽

Vol 134 ◽

pp. 342-351 ◽

Cited By ~ 81

Author(s):

Tianxue Zhu ◽

Shuhui Li ◽

Jianying Huang ◽

Manuela Mihailiasa ◽

Yuekun Lai

Keyword(s):

Rational Design ◽

Cotton Fabrics ◽

Superhydrophobic Coating ◽

Water Separation ◽

Uv Shielding ◽

Oil Water Separation ◽

Oil Water ◽

Self Cleaning

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3D network super-hydrophobic hexafluorbisphenol A poly(aryl ether ketone) membrane prepared by one-step electrospraying

High Performance Polymers ◽

10.1177/0954008320930064 ◽

2020 ◽

Vol 32 (10) ◽

pp. 1094-1101

Author(s):

Yongpeng Wang ◽

Pengtao Yan ◽

Xintong Huo ◽

Mengzhu Liu ◽

Haibo Zhang ◽

...

Keyword(s):

Large Scale ◽

Condensation Polymerization ◽

Aryl Ether ◽

Sliding Angle ◽

Water Separation ◽

3D Network ◽

Oil Water Separation ◽

Aryl Ether Ketone ◽

Oil Water ◽

Ether Ketone

Novel super-hydrophobic poly(aryl ether ketone) (PAEK) membranes have been firstly prepared by modifying ordinary PAEK into hexafluorbisphenol A-PAEK through traditional nucleophilic condensation polymerization and subsequently simple electrospraying technique. With the solution concentration increased, the micromorphology exhibited nanofibers, nanofiber with spindles, 3D network with microspheres embedded, microspheres and dense films, successively. The static water contact angle increased from 99° to 155°, while the sliding angle from 1.3° to 6.8° (±1°), in which the 3D network presented the strongest super-hydrophobicity. After 200 h of water flushing, the rough surface structure and super-hydrophobicity of the membranes were well retained. Moreover, the membrane exhibited wonderful self-cleaning property, oil/water separation property, and stability due to the hierarchical micro/nanostructures. This work provides a new route for the creation of super-hydrophobic high performance engineering plastic fabrics with the potential values in large-scale application of filtration, oil/water separation, and antifouling.

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