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Switchable Wettability Surface with Chemical Stability and Antifouling Properties for Controllable Oil–Water Separation
journal contribution
posted on 2019-03-08, 00:00 authored by Hanpeng Gao, Yan Liu, Guoyong Wang, Shuyi Li, Zhiwu Han, Luquan RenMembrane
materials with special wettability for separating oil–water
mixtures have gradually become one of the research hotspots. However,
oily wastewater usually has very strong corrosiveness, which puts
forward high requirements for the chemical stability of the separation
membrane. In addition, oil droplets may block the pores, resulting
in the decrease of separation efficiency or even separation failure.
Herein, biomimetic TiO2–titanium meshes (BTTMs)
with switchable wettability were successfully fabricated by one-step
dip coating of poly(vinylidene difluoride) and modified TiO2 suspension on the titanium meshes. The simple and efficient preparation
method will facilitate the promotion of this smart material. Due to
the controlled wettability, the BTTM can separate water or oil from
an oil–water mixture as required. When the BTTM was immersed
in strong corrosive solution or liquid nitrogen, the wettability did
not change much, showing the good stability of the BTTM. Furthermore,
the BTTM also has self-healing ability, self-recovery anti-oil-fouling
properties, and self-cleaning behavior, which help it resist oil pollution
and improve its recyclability. This study provides a simple and efficient
strategy for fabricating a stable smart surface for on-demand controllable
treatment of corrosive oily wastewater.
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Keywords
oil dropletsChemical Stabilitymaterialseparation failureswitchable wettabilityself-cleaning behaviortitanium meshesseparation efficiencyTiO 2 suspensionoil pollutionAntifouling Propertieschemical stabilityBTTMmixturedip coatingself-healing abilitySwitchable Wettability Surfaceseparation membraneself-recovery anti-oil-fouling propertiespreparation methodresearch hotspotswastewater
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