scholarly journals Adsorption and superficial transport of oil on biological and bionic superhydrophobic surfaces: a novel technique for oil–water separation

2020 ◽  
Vol 378 (2167) ◽  
pp. 20190447
Author(s):  
W. Barthlott ◽  
M. Moosmann ◽  
I. Noll ◽  
M. Akdere ◽  
J. Wagner ◽  
...  
Keyword(s):  
Oil Spills ◽  
Superhydrophobic Surfaces ◽  
Contaminated Water ◽  
Theme Issue ◽  
External Energy ◽  
Water Separation ◽  
Lotus Effect ◽  
Oil Water Separation ◽  
Air Layers ◽  
Oil Water

Superhydrophobicity is a physical feature of surfaces occurring in many organisms and has been applied (e.g. lotus effect) in bionic technical applications. Some aquatic species are able to maintain persistent air layers under water ( Salvinia effect) and thus become increasingly interesting for drag reduction and other ‘bioinspired’ applications. However, another feature of superhydrophobic surfaces, i.e. the adsorption (not absorption) and subsequent superficial transportation and desorption capability for oil, has been neglected. Intense research is currently being carried out on oil-absorbing bulk materials like sponges, focusing on oleophilic surfaces and meshes to build membranes for oil–water separation. This requires an active pumping of oil–water mixtures onto or through the surface. Here, we present a novel passive, self-driven technology to remove oil from water surfaces. The oil is adsorbed onto a superhydrophobic material (e.g. textiles) and transported on its surface. Vertical and horizontal transportation is possible above or below the oil-contaminated water surface. The transfer in a bioinspired novel bionic oil adsorber is described. The oil is transported into a container and thus removed from the surface. Prototypes have proven to be an efficient and environmentally friendly technology to clean oil spills from water without chemicals or external energy supply. This article is part of the theme issue ‘Bioinspired materials and surfaces for green science and technology (part 3)’.

scholarly journals Facile fabrication of raspberry-like composite microspheres for the construction of superhydrophobic films and applications in highly efficient oil–water separation

RSC Advances ◽  
2017 ◽  
Vol 7 (63) ◽  
pp. 39471-39479 ◽  
Author(s):  
Mingguang Yu ◽  
Qing Wang ◽  
Min Zhang ◽  
Qianjun Deng ◽  
Dongchu Chen
Keyword(s):  
Superhydrophobic Surfaces ◽  
Synthetic Route ◽  
Water Separation ◽  
Lotus Effect ◽  
Highly Efficient ◽  
Composite Microspheres ◽  
Oil Water Separation ◽  
Facile Fabrication ◽  
Oil Water

Inspired by the “lotus effect”, we proposed a facile synthetic route toward raspberry-like PS@SiO2 microspheres, which further lead to superhydrophobic surfaces.

Fabrication of hydrophobic NiFe2O4@poly(DVB-LMA) sponge via Pickering emulsion template method for oil/water separation

Soft Matter ◽  
2021 ◽  
Author(s):  
Caimei Zhao ◽  
Lei Chen ◽  
Chuanming Yu ◽  
Binghua Hu ◽  
Haoxuan Huang ◽  
...  
Keyword(s):  
Oil Spills ◽  
Low Cost ◽  
Pickering Emulsion ◽  
Template Method ◽  
Water Separation ◽  
Environment Friendly ◽  
Oil Water Separation ◽  
Oil Water ◽  
Cost Efficient

Super-hydrophobic porous absorbent is a convenient, low-cost, efficient and environment-friendly material in the treatment of oil spills. In this work, a simple Pickering emulsion template method was employed to fabricate...

scholarly journals Surface Engineering of Ceramic Nanomaterials for Separation of Oil/Water Mixtures

2020 ◽  
Vol 8 ◽  
Author(s):  
Usama Zulfiqar ◽  
Andrew G. Thomas ◽  
Allan Matthews ◽  
David J. Lewis
Keyword(s):  
Surface Engineering ◽  
Oil Spills ◽  
Chemical Interaction ◽  
Low Cost ◽  
Water Mixture ◽  
Water Separation ◽  
Manufacturing Operations ◽  
Industrial Oil ◽  
Oil Water Separation ◽  
Oil Water

Oil/water mixtures are a potentially major source of environmental pollution if efficient separation technology is not employed during processing. A large volume of oil/water mixtures is produced via many manufacturing operations in food, petrochemical, mining, and metal industries and can be exposed to water sources on a regular basis. To date, several techniques are used in practice to deal with industrial oil/water mixtures and oil spills such as in situ burning of oil, bioremediation, and solidifiers, which change the physical shape of oil as a result of chemical interaction. Physical separation of oil/water mixtures is in industrial practice; however, the existing technologies to do so often require either dissipation of large amounts of energy (such as in cyclones and hydrocyclones) or large residence times or inventories of fluids (such as in decanters). Recently, materials with selective wettability have gained attention for application in separation of oil/water mixtures and surfactant stabilized emulsions. For example, a superhydrophobic material is selectively wettable toward oil while having a poor affinity for the aqueous phase; therefore, a superhydrophobic porous material can easily adsorb the oil while completely rejecting the water from an oil/water mixture, thus physically separating the two components. The ease of separation, low cost, and low-energy requirements are some of the other advantages offered by these materials over existing practices of oil/water separation. The present review aims to focus on the surface engineering aspects to achieve selectively wettability in materials and its their relationship with the separation of oil/water mixtures with particular focus on emulsions, on factors contributing to their stability, and on how wettability can be helpful in their separation. Finally, the challenges in application of superwettable materials will be highlighted, and potential solutions to improve the application of these materials will be put forward.

Continuous oil–water separation with surface modified sponge for cleanup of oil spills

RSC Advances ◽  
2014 ◽  
Vol 4 (96) ◽  
pp. 53514-53519 ◽  
Author(s):  
Daxiong Wu ◽  
Ziya Yu ◽  
Wenjuan Wu ◽  
Linlin Fang ◽  
Haitao Zhu
Keyword(s):  
Oil Spills ◽  
Water Separation ◽  
Oil Water Separation ◽  
Oil Water ◽  
Surface Modified

scholarly journals Fabrication of PDMS@Fe3O4/MS Composite Materials and Its Application for Oil-Water Separation

Materials ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 115
Author(s):  
Jiaqi Wang ◽  
Zhenzhong Fan ◽  
Qingwang Liu ◽  
Qilei Tong ◽  
Biao Wang
Keyword(s):  
Magnetic Force ◽  
Oil Spills ◽  
Low Cost ◽  
Oily Wastewater ◽  
Water Separation ◽  
Simple Preparation ◽  
Oil Water Separation ◽  
Absorbing Material ◽  
Oil Water ◽  
Nano Fe3o4

The discharge of oily wastewater and oil spills at sea are the current difficulties in water pollution control. This problem often leads to terrible disasters. Therefore, the effective realization of oil-water separation is a very challenging problem. Superhydrophobic sponge is a promising oil-absorbing material. In this article, we reported a superhydrophobic sponge with nano-Fe3O4 for oil-water separation. The addition of nano-Fe3O4 allows the sponge to be recycled under the action of magnetic force. The sponge has the advantages of low cost, simple preparation and efficient oil-water separation. This kind of sponge is very worthy of promotion for the treatment of oily wastewater and marine oil spill accidents.

A water-rich system of constructing durable and fluorine-free superhydrophobic surfaces for oil/water separation

2020 ◽  
Vol 507 ◽  
pp. 145165 ◽  
Author(s):  
Maiping Yang ◽  
Chi Jiang ◽  
Weiqu Liu ◽  
Liyan Liang ◽  
Yankun Xie ◽  
...  
Keyword(s):  
Superhydrophobic Surfaces ◽  
Water Separation ◽  
Oil Water Separation ◽  
Oil Water
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