Abstract
A series of different ratios of Bi4O5I2/Ag3PO4 (abbreviated as Bi4AP) composite photocatalysts were synthesized and characterized through XRD, FT-IR, SEM, EDS and UV–vis DRS analysis, respectively. The photocatalytic properties of as-prepared samples were evaluated by photodegradation of Rhodamine B (RhB) in the visible range. The results showed that the photocatalytic activity of the composite photocatalyst was higher than that of pure Bi4O5I2 or Ag3PO4. Among the as-prepared samples, the photodegradation ability of Bi4AP-3 was more remarkable, and RhB underwent complete degradation in 60 min under optimal conditions (T = 308 K, pH = 9). Trapping experiments proved that photogenerated holes (h+) were the main active substance in the photocatalytic process, superoxide radicals (·O2−) and hydroxyl radicals (·OH) also played an important role. Furthermore, the photocatalytic mechanism was also proposed.
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