期刊
APPLIED SURFACE SCIENCE
卷 426, 期 -, 页码 622-629出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2017.06.302
关键词
Electrospun membranes; Photocatalytic activity; Titanium dioxide; Ag nanoparticles; Methylene blue
类别
资金
- Fundamental Research Funds for the Central Universities [YS201402]
- National Natural Science Foundation of China [51273015, 51533001, 51521062]
Although TiO2-based photocatalysts have exhibited a great potential for degradation of organic pollutants, it is still necessary to simultaneously enhance their visible-light-driven photocatalytic efficiency and physical recyclability. Herein, highly efficient, visible-light-driven photocatalytically active, and recyclable nanofibrous membranes with thin TiO2/Ag heterojunction layer are prepared using electrospun polyacrylonitrile (PAN) nanofibrous membrane as the substrate. By regulating the concentration and hydrolysis process of Ti precursors, TiO2 nanoparticles steadily grow on the PAN nanofibers with high-specific surface area to form a continuous mesoporous shell with the thickness of 20 nm for efficient degradation of organic pollutants. Furthermore, to form a stable heterojunction structure, Ag nanoparticles are deposited on the TiO2 surface by using dopamine as a binder and reductant. The presence of Ag nanoparticles leads to an obvious red-shift from 380 nm to 490 nm, which improves the utilization efficiency of visible light, and reduces the electron/hole recombination rate simultaneously. The resulting PAN@TiO2/Ag membranes hold enhanced photocatalytic activity for methylene blue degradation within 1 h under visible light irradiation, and satisfactory recyclability, which endow them with a great potential for adsorption and photocatalytic applications. (C) 2017 Published by Elsevier B.V.
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