期刊
APPLIED SURFACE SCIENCE
卷 257, 期 16, 页码 7083-7089出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2011.03.046
关键词
AgI/AgCl/TiO2; Visible-light photocatalysis; Methyl orange; Photocatalytic mechanism
类别
资金
- Natural Science Foundation of China [20973071]
- Anhui Key Laboratory of Energetic Materials [KLEM2009013]
In this paper, a novel composite photocatalyst AgI/AgCl/TiO2 was prepared by ion exchange method and characterized by XRD, SEM and UV-Vis spectrometry. The as-prepared AgI/AgCl/TiO2 composites show much higher photocatalytic activity than AgCl/TiO2 and AgI/TiO2 under visible-light irradiation (lambda > 400 nm) in the process of methyl orange (MO) degradation. When the molar percentage of AgI to initial AgCl is 20% (sample SE-20%), the maximal degradation efficiency of MO has reached 85.8% after irradiation for 120 min. The enhancement of photocatalytic activity of the composite photocatalyst AgI/AgCl/TiO2 will be attributed to its good absorption in the visible-light region, especially low recombination rate of the electron-hole pairs based on the photoluminescence (PL) spectra investigation of AgI/AgCl/TiO2 and the matching band structures of AgI, AgCl and TiO2. The detection of reactive species by radical scavengers displays that center dot O2-- and H2O2 are the main reactive species for the degradation of MO under visible-light irradiation. Moreover, PL analysis by using terephthalic acid (TA) as a probe molecule further reveals that center dot OH can be negligible for the degradation of MO. (C) 2011 Elsevier B.V. All rights reserved.
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