Abstract
It is of urgency to develop novel and high-efficient visible-light photocatalysts to eliminate antibiotics and organic pollutants rapidly in sewage. Therefore, the silver molybdate/aluminum atoms-doped zinc oxide (Ag2MoO4/AZO) nanocomposite was prepared by in situ deposition, and then the Ag dots were decorated on this nanocomposite surface via photo-reduced reaction forming a multiple complementary Ag@Ag2MoO4/AZO hybrid nanocomposite. The photogenerated electrons of AZO transferred to Ag2MoO4 surface, which solved the optical instability of Ag2MoO4 material increasing the recyclability. The photocatalytic efficiency of Ag@Ag2MoO4/AZO nanocomposite still remained 90.0% after eight runs. Meanwhile, the Ag dots decorated on the Ag@Ag2MoO4/AZO nanocomposite surface decreased the band gap and broadened the visible-light absorption range, promoting the efficient separation of photogenerated carriers. Because of the synergistic complementary effect of Ag dots and AZO solid solution, the Ag@Ag2MoO4/AZO hybrid nanocomposite showed excellent photocatalytic activity on organic pollutants compared to AZO and Ag2MoO4 material (282.3% and 422.7% improvement, respectively). In addition, the gatifloxacin was completely degraded to CO2 and H2O within 40 min, indicating that the Ag@Ag2MoO4/AZO hybrid nanocomposite also has excellent application in the treatment of antibiotics.
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