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

RSC Advances ◽  
2016 ◽  
Vol 6 (105) ◽  
pp. 103632-103640 ◽  
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.

A facile one-step preparation method of recyclable superhydrophobic polypropylene membrane for oil–water separation

RSC Advances ◽  
2016 ◽  
Vol 6 (66) ◽  
pp. 61129-61136 ◽  
Author(s):  
Ankit M. Kansara ◽  
Sanjay G. Chaudhri ◽  
Puyam S. Singh
Keyword(s):  
Preparation Method ◽  
Dip Coating ◽  
Water Separation ◽  
Polypropylene Membrane ◽  
Coating Method ◽  
Oil Water Separation ◽  
One Step ◽  
Oil Water ◽  
Dip Coating Method

A facile one-step dip-coating method to prepare recyclable superhydrophobic polypropylene membrane.

scholarly journals A facile procedure to modify filter paper for oil–water separation

RSC Advances ◽  
2017 ◽  
Vol 7 (48) ◽  
pp. 30495-30499 ◽  
Author(s):  
Xinde Tang ◽  
Chunli Shen ◽  
Wenjing Zhu ◽  
Shuai Zhang ◽  
Youfu Xu ◽  
...  
Keyword(s):  
Silica Nanoparticles ◽  
Filter Paper ◽  
Dip Coating ◽  
Water Separation ◽  
Coating Method ◽  
Hydrophobic Paper ◽  
Oil Water Separation ◽  
Oil Water ◽  
Dip Coating Method

A much simpler and broadly applicable dip-coating method using silica nanoparticles and a silane coupler for preparing hydrophobic paper is presented.

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

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
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.

A multi-function textile with pH-induced switch wettability transition for controllable oil−water separation

2021 ◽  
pp. 004051752110569
Author(s):  
Long Feng ◽  
Yimiao Hou ◽  
Qingqing Hao ◽  
Mingxing Chen ◽  
Shuo Wang ◽  
...  
Keyword(s):  
Contact Angle ◽  
Separation Efficiency ◽  
Nonwoven Fabric ◽  
Dip Coating ◽  
Municipal Sewage ◽  
Alkaline Condition ◽  
Separation Performance ◽  
Water Separation ◽  
Oil Water Separation ◽  
Oil Water

The deterioration of water ecology caused by the discharge of oil spill wastewater, industrial sewage, and municipal sewage has attracted wide attention worldwide. Thus, it is significant to design a simple, environmentally friendly approach to separate oil–water mixtures. In this work, three different fabrics with pH-induced wettability transition were prepared by a dip-coating process for oil and water separation. The dip-coating fabrics had the advantages of oil–water separation, photocatalytic degradation, and recycling. Polyethylene terephthalate/polyamide nonwoven fabric was used as the substrate materials of the fabric. The carboxylic acid-modified TiO2 endowed the fabric with hydrophilicity–hydrophobicity and photocatalytic properties. The Fe3O4 nanoparticles obtained by the coprecipitation method provided magnetism for the fabric, facilitating the recycling of the fabric and improving the hydrophobicity of the fabric. The fabrics coated with dipping solutions were superhydrophobic in a neutral environment and hydrophilic in an alkaline environment. Among the three coated fabrics, the fabric coated with stearic acid/TiO2-Fe3O4 (FST) had the most satisfying oil–water separation performance and durability. Under the neutral condition, the contact angle of the FST was 151° and the separation efficiency was 98%. Under the alkaline condition, the underwater oil contact angle of the FST was 150° and the separation efficiency was 95%. After 15 cycles, the oil–water separation rate of the FST was still higher than 90%. Due to the presence of TiO2, the coated fabric had an exceptional performance in the photodegradation of organic pollutants (69.9%). In addition, the fabrics can be quickly recovered due to magnetism.

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

2021 ◽  
Author(s):  
Baiyi Chen ◽  
Rongrong Zhang ◽  
Hexuan Fu ◽  
Jiadai Xu ◽  
Yuan Jing ◽  
...  
Keyword(s):  
Superhydrophobic Surface ◽  
Large Scale ◽  
Separation Efficiency ◽  
Operating Conditions ◽  
Superhydrophobic Coating ◽  
Water Separation ◽  
High Transparency ◽  
Candle Soot ◽  
Oil Water Separation ◽  
Oil Water

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.

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

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.

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

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.

A facile dip-coating approach to stable superhydrophobic SiO2/epoxy resin membrane preparation for micro-water separation in transformer oil liquids

RSC Advances ◽  
2015 ◽  
Vol 5 (113) ◽  
pp. 92947-92953 ◽  
Author(s):  
Liangwei Zhou ◽  
Ping Yu ◽  
Yunhua He ◽  
Huanhuan Xia ◽  
Xinliang Guo ◽  
...  
Keyword(s):  
Epoxy Resin ◽  
Dip Coating ◽  
Transformer Oil ◽  
Membrane Preparation ◽  
Water Separation ◽  
Oil Water Separation ◽  
Oil Water ◽  
Resin Membrane

Oil–water separation apparatus, in which the membrane was put at the bottom of the ultrafiltration cup. When the transformer oil was passed through the membrane, the water was retained above the membrane.

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