Non-fluorinated superhydrophobic spray coatings for oil-water separation applications: An eco-friendly approach

Subramanian, B.; Alla, Jaya Prakash; Essomba, Jean Serge; Fathima, Nishter Nishad

doi:10.1016/j.jclepro.2020.120693

Cited by 52 publications

(21 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is well known that superhydrophobic materials and surfaces can separate oil from water as well as their stabilized emulsions (o/w) [50][51][52]. Taking advantage of this ability, we used the superhydrophobic material obtained in this study to remove MPs from water.…”

Section: Microplasticsmentioning

confidence: 99%

Durable Superhydrophobic Coating for Efficient Microplastic Removal

2021

View full text Add to dashboard Cite

The pollution caused by microplastics around the world is an increasingly significant issue that has to be tackled with different methods and technologies. Here, we report a straightforward and rapid process combining electrodeposition and electrophoresis to produce a durable superhydrophobic coating on an aluminum substrate (UNS A91070) that has a static contact angle (153°), sliding angle (1°), and contact angle hysteresis (1°). Field emission scanning electron microscopy and high-resolution transmission electron microscopy showed the presence of a hierarchical structure with nanolayers that were 70 nm thick. The chemical composition was also analyzed using attenuated total reflectance-Fourier transform infrared spectroscopy and high-resolution X-ray photoelectron spectroscopy, which revealed that the hierarchical structure was composed of zinc laurate (Zn(C11H20COO)2) that decreased the surface free energy of the system. Moreover, the coating showed high durability against abrasion caused by the P1200 SiC paper due to the presence of TiO2 particles in the upper layers as well as the homogeneous chemical composition of the hierarchical structure. Finally, taking advantage of the superoleophilic properties of superhydrophobic surfaces, the ability of the coating to remove high-density polyethylene microplastics from water was studied.

show abstract

Section: Microplasticsmentioning

confidence: 99%

Durable Superhydrophobic Coating for Efficient Microplastic Removal

2021

View full text Add to dashboard Cite

show abstract

“…Due to the extremely low stickiness of liquid drops on natural non-wettable surfaces forms a sphere shape and instantly roll off the surface 1 . The extremely water repellent surfaces which exhibit a contact angle greater than 150° are famously known as superhydrophobic surfaces 2 . Superhydrophobic surfaces have aroused a lot of interest because of their importance in fundamental science and industrial applications.…”

Section: Introductionmentioning

confidence: 99%

“…Historically, the used low surface energy material is perfluorinated compounds, including fluoro silanes or fluorocarbon molecules, due to their ultralow surface energy (≈ 10 mJ m −2 ) 14 . However, using such long-chained fluorocarbons has been proven to be very toxic and possess negative environmental outcomes such as persistence, biomagnification, and bioaccumulation 2 , 14 – 17 . Hence, there is a need to develop low-cost, eco-friendly methods and environmentally friendly materials in fabricating superhydrophobic surfaces 18 .…”

Section: Introductionmentioning

confidence: 99%

Fabrication of eco-friendly graphene-based superhydrophobic coating on steel substrate and its corrosion resistance, chemical and mechanical stability

Mohamed

Ezzat

Abdel‐Gaber

2022

Sci Rep

View full text Add to dashboard Cite

Superhydrophobic coatings were successfully fabricated on steel substrates using potentiostatic electrodeposition of Ni and Ni-graphene, Ni-G, coatings followed by immersion in an ethanolic solution of stearic acid, SA. Rice straw, an environmentally friendly biomass resource, was used to synthesize high-quality graphene. The Raman spectra proved the high quality of the produced graphene. The Fourier transform infrared spectroscopy, FTIR, results showed that the Ni coating grafted with stearic acid, Ni-SA, and the Ni-G composite grafted with stearic acid, Ni-G-SA, were successfully deposited on the steel substrate. The scanning electron microscope, SEM, results showed that the prepared superhydrophobic coatings exhibit micro-nano structures. The wettability results revealed that the values of contact angles, CAs, for Ni-SA and Ni-G-SA coatings are 155.7° and 161.4°, while the values of sliding angles, SAs, for both coatings are 4.0° and 1.0°, respectively. The corrosion resistance, chemical stability, and mechanical abrasion resistance of the Ni-G-SA coating were found to be greater than those of the Ni-SA coating.

show abstract

“…Research on superhydrophobic [ 1 , 2 ], superoleophobic [ 3 , 4 ], superamphiphobic [ 4 , 5 , 6 , 7 ] and superoleophilic [ 8 , 9 , 10 ] surfaces has developed rapidly in recent years [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 ]. Meanwhile, an increasing number of applications for such surfaces, including self-cleaning [ 21 ], anti-fingerprint coatings [ 22 ], anti-fog coatings [ 23 ], microdroplet transfer technology [ 24 ] and oil–water separation [ 25 , 26 , 27 , 28 , 29 , 30 ], have been investigated. Superhydrophilic surfaces have been drawing extensive attention since Fujishima found that nanoscale TiO 2 possesses superhydrophilic properties when exposed to light and recovers its hydrophobic nature in the dark with cyclic reversibility [ 31 ].…”

Section: Introductionmentioning

confidence: 99%

Micro/Nanoscale Structured Superhydrophilic and Underwater Superoleophobic Hybrid-Coated Mesh for High-Efficiency Oil/Water Separation

et al. 2020

View full text Add to dashboard Cite

A novel micro/nanoscale rough structured superhydrophilic hybrid-coated mesh that shows underwater superoleophobic behavior is fabricated by spray casting or dipping nanoparticle–polymer suspensions on stainless steel mesh substrates. Water droplets can spread over the mesh completely; meanwhile, oil droplets can roll off the mesh at low tilt angles without any penetration. Besides overcoming the oil-fouling problem of many superhydrophilic coatings, this superhydrophilic and underwater superoleophobic mesh can be used to separate oil and water. The simple method used here to prepare the organic–inorganic hybrid coatings successfully produced controllable micro-nano binary roughness and also achieved a rough topography of micro-nano binary structure by controlling the content of inorganic particles. The mechanism of oil–water separation by the superhydrophilic and superoleophobic membrane is rationalized by considering capillary mechanics. Tetraethyl orathosilicate (TEOS) as a base was used to prepare the nano-SiO2 solution as a nano-dopant through a sol-gel process, while polyvinyl alcohol (PVA) was used as the film binder and glutaraldehyde as the cross-linking agent; the mixture was dip-coated on the surface of 300-mesh stainless steel mesh to form superhydrophilic and underwater superoleophobic film. Properties of nano-SiO2 represented by infrared spectroscopy and surface topography of the film observed under scanning electron microscope (SEM) indicated that the film surface had a coarse micro–nano binary structure; the effect of nano-SiO2 doping amount on the film’s surface topography and the effect of such surface topography on hydrophilicity of the film were studied; contact angle of water on such surface was tested as 0° by the surface contact angle tester and spread quickly; the underwater contact angle to oil was 158°, showing superhydrophilic and underwater superoleophobic properties. The effect of the dosing amount of cross-linking agent to the waterproof swelling property and the permeate flux of the film were studied; the oil–water separation effect of the film to oil–water suspension and oil–water emulsion was studied too, and in both cases the separation efficiency reached 99%, which finally reduced the oil content to be lower than 50 mg/L. The effect of filtration times to permeate flux was studied, and it was found that the more hydrophilic the film was, the stronger the stain resistance would be, and the permeate flux would gradually decrease along with the increase of filtration times.

show abstract

Non-fluorinated superhydrophobic spray coatings for oil-water separation applications: An eco-friendly approach

Cited by 52 publications

References 33 publications

Durable Superhydrophobic Coating for Efficient Microplastic Removal

Durable Superhydrophobic Coating for Efficient Microplastic Removal

Fabrication of eco-friendly graphene-based superhydrophobic coating on steel substrate and its corrosion resistance, chemical and mechanical stability

Micro/Nanoscale Structured Superhydrophilic and Underwater Superoleophobic Hybrid-Coated Mesh for High-Efficiency Oil/Water Separation

Contact Info

Product

Resources

About