聚偏氟乙烯
材料科学
光降解
聚四氟乙烯
乳状液
接触角
热液循环
膜
光催化
化学工程
氟化物
复合材料
聚合物
有机化学
催化作用
化学
无机化学
工程类
生物化学
作者
Linghan Deng,Yong Zen Tan,Xingyu Tian,Hai-Jun Huang,Quanpei Xie,Chaohai Sun,Chuanxiang Qin,Si Cheng
标识
DOI:10.1002/mame.202200156
摘要
Abstract The photocatalytic and inherently hydrophilic characteristic of titanium dioxide (TiO 2 ) make it very suitable for separating oil‐in‐water emulsion and aqueous pollutants removal. However, the removal of the oily dyes in water‐in‐oil emulsion usually needs superhydrophobic/superoleophilic membranes. Although surface modification of TiO 2 with fluorinated organic compounds can bring hydrophobicity, the hydrophobic surface would change back to a hydrophilic surface again after light illumination as fluorinated organic molecules are easily photodegraded too. To date, very few reports have successfully fabricated TiO 2 photocatalysts keeping long‐term superhydrophobicity after repeatable photodegradation. Herein, an approach to fabricate polyvinylidene fluoride (PVDF)/polytetrafluoroethylene (PTFE) @TiO 2 nanofibrous membranes through dehydrofluorination and one‐pot hydrothermal process, which possess stable superhydrophobicity in various harsh environments, is reported. For the first time, PTFE is bonded with PVDF through dehydrofluorination which induces crosslinking between PTFE and PVDF chains. Owing to the existence of PTFE, extensive hydrophobic TiO 2 can be in situ grown on the rough surface of PVDF/PTFE nanofibers through one‐pot hydrothermal process. These features ensure that the membranes possess durable and high‐efficient water‐in‐oil emulsion separation and photodegradation performance. The photodegradation efficiency of the PVDF/PTFE@TiO 2 membranes for oil‐soluble dyes remains above 95% even after ten cycles.
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