Abstract
In this paper, a novel composite photocatalyst AgI/AgCl/TiO 2 was prepared by ion exchange method and characterized by XRD, SEM and UV–Vis spectrometry. The as-prepared AgI/AgCl/TiO 2 composites show much higher photocatalytic activity than AgCl/TiO 2 and AgI/TiO 2 under visible-light irradiation ( λ > 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/TiO 2 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/TiO 2 and the matching band structures of AgI, AgCl and TiO 2. The detection of reactive species by radical scavengers displays that O 2 − and H 2O 2 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 OH can be negligible for the degradation of MO.
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