期刊
APPLIED SURFACE SCIENCE
卷 284, 期 -, 页码 229-234出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2013.07.086
关键词
TiO2; Fly ash bead; Co-doped; Visible light; Photocatalytic activity
类别
资金
- National Natural Science Foundation of China [51172059, 91023030, 51072044, 51102071]
- Anhui Province Natural Science Foundation [11040606M54]
Using TiCl4 as the titanium source, urea as the precipitating agent, nano-TiO2/fly ash beads composite materials were prepared by hydrolysis-precipitation method. Using (NH2)(2)CO and (NH2)(2)SC as the N and S source respectively, N and S co-doped TiO2/fly ash beads composite materials were prepared by grinding them together according to a certain proportion and calcined at 500 degrees C for 2 h. The composite materials were characterized by SEM, EDS, XPS, and UV-vis spectrophotometer methods. The UV-vis absorption spectra results show that the absorption edge of un-doped composites is 390 nm while that of doped composites red-shifts to 500 nm. The photocatalytic activity of composite materials was evaluated by degradation of methyl orange under visible light irradiation (halogen lamp, 250 W). The results showed that after irradiation for 1 h, degradation rate of N, S co-doped-TiO2/fly ash beads composite material can reach 65%, while the degradation rate of un-doped sample and P25 were just 10% and 6%, respectively. The composite material also showed excellent recycling properties. (C) 2013 Elsevier B. V. All rights reserved.
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