Facile Preparation of Durable Superhydrophobic Coating by Liquid-Phase Deposition for Versatile Oil/Water Separation

Serious damage caused by oily wastewater makes the development of efficient superhydrophobic and superoleophilic materials for oil/water separation processes critical and urgent. Herein, durable superhydrophobic nanometer-scale TiO2 grains with low-surface-energy substance composite-modified materia...

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Bibliographic Details
Published inCoatings (Basel) Vol. 13; no. 5; p. 925
Main Authors Fan, Shumin, Tang, Lulu, Zhao, Xin, Xu, Guangri, Fan, Wenxiu
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 15.05.2023
Subjects
Abrasion
Acids
Chemical spills
Contact angle
Cotton
Efficiency
Energy consumption
Epoxy resins
Ethanol
Hydrophobic surfaces
Hydrophobicity
Liquid phase deposition
Liquid phases
Mixtures
Nanocomposites
Nanoparticles
Oil spills
Petroleum in submerged lands
Reagents
Sawdust
Separation
Stearic acid
Substrates
Surface energy
Surface preparation
Titanium dioxide
Wastewater
Water damage
China
United States > US
Sudan
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Summary:Serious damage caused by oily wastewater makes the development of efficient superhydrophobic and superoleophilic materials for oil/water separation processes critical and urgent. Herein, durable superhydrophobic nanometer-scale TiO2 grains with low-surface-energy substance composite-modified materials were fabricated by using a cost-effective and facile synthesis method for the gravity-driven separation of oil/water mixtures under harsh conditions. Different substrates, such as sawdust, wheat straw, cotton, sponge and fabric, were applied for superhydrophobic surface preparation, and various low-surface-energy reagents could interact with deposited TiO2 nanoparticles, including cetylamine, dodecanethiol, stearic acid and HDTMS. The resultant materials showed superhydrophobic properties with a water contact angle (WCA) higher than 150.8°. The separation of various oil/water mixtures with high efficiency and purity was acquired by using the as-prepared sponge. More importantly, the coated sponge exhibited good resistance to various harsh environmental solutions. Moreover, its superhydrophobicity also remained even after 12 months of storage in air or 10 cycles of abrasion. The durable superhydrophobic coating prepared in this work could be practically used for the highly efficient separation of oil/water mixtures under various harsh conditions.
ISSN:2079-6412
2079-6412
DOI:10.3390/coatings13050925