Efficient degradation of AO7 by CuO/Bi2MoO6 composites synergistically with peroxymonosulfate under visible light
In this paper,CuO/Bi2MoO6 heterojunctions were successfully synthesized by hydrothermal method and impregnation calcination method,and a synergistic catalytic system of CuO/Bi2MoO6 composites activated by peroxymonosulfate to degrade AO7 under visible light was established.X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),scanning electron microscopy(SEM)and ultraviolet-visible diffuse reflectance spectroscopy(UV-vis)were used to investigate the crystal phase structure,elemental composition,morphological structure and absorption of the composites The wavelengths were characterized and the removal performance of AO7 under different conditions was discussed.The results showed that the introduction of CuO enhanced the photocatalytic performance of Bi2MoO6 and enhanced the activation of PMS at the same time.When the concentration of AO7 is 0.1 mmol·L-1,the catalyst is 0.25 g·L-1,and the PMS is 1 mmol·L-1,the degradation rate of AO7 can reach more than 99％within 30 min.A possible degradation mechanism of AO7 was proposed and verified by free radical elimination experiments.The composites can still maintain the activation performance after 5 degradation cycles and have high stability.
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