Hygro-responsive, Photo-decomposed Superoleophobic/Superhydrophilic Coating for On-Demand Oil-Water Separation

被引：64
作者：
Kong, Wenting [1 ,2 ]
Li, Feiran [1 ,2 ]
Pan, Yunlu [1 ,2 ]
Zhao, Xuezeng [1 ,2 ]
机构：
[1] Harbin Inst Technol HIT, Key Lab Microsyst & Microstruct Mfg, Minist Educ, Harbin 150001, Peoples R China
[2] Harbin Inst Technol HIT, Sch Mechatron Engn, Harbin 150001, Peoples R China
来源：
ACS APPLIED MATERIALS & INTERFACES | 2021年 / 13卷 / 29期
基金：
美国国家科学基金会;
关键词：
superoleophobic/superhydrophilic; superhydrophobic/superoleophilic; TiO2 liquid-phase deposition; wettablitty transformation; PFOA decomposition; SWITCHABLE WETTABILITY; SURFACE; TIO2; FILM;
D O I：
10.1021/acsami.1c08500
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The superoleophobic/superhydrophilic material has attracted considerable interest due to the incomparable property of it for the oil-water separation. However, it is a challenge to make the prepared surface superoleophobic and superhydrophilic at the same time since the oleophobic surface tends to repel water. Herein, a hygro-responsive superoleophobic/superhydrophilic coating was fabricated by liquid-phase deposition of TiO2 with perfluorooctanoic acid. The wettability of the coating could complete the transformation from superoleophobicity/superhydrophilicity to superhydrophobicity/superoleophilicity, both of which exhibit excellent selective superwettability under the air, underwater, salt, alkali, and acid conditions. The hygro-responsive coating can separate different types of oil-water mixtures, and the separation efficiency could be over 99% using different capillary forces acting on the oil and water phases before and after wettability transformation. Last but not least, long-chain perfluoroalkyl substances on the coating could be decomposed by UV irradiation, which could reduce the harm to the environment and human beings. It is anticipated that the developed superoleophobic/superhydrophilic coating provides a feasible solution for the application of oil-water separation.
引用
收藏
页码：35142 / 35152
页数：11
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