Abstract
In this paper, we prepared P-N type Ag2O/TiO2 heterojunction photocatalysts via the precipitation method and found that their photocatalytic performance significantly declined after cyclic use. To understand the inactivation mechanism, we analyzed the photocatalyst samples using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), electron spin resonance spectroscopy (ESR), and inductively coupled plasma spectroscopy (ICP) during the recycling process. Our results showed that the Ag2O content in the composite photocatalyst decreased sharply, and the characteristic peak intensity of the {111} crystal plane of Ag2O in the photocatalyst gradually decreased. Based on these findings, we proposed a mechanism for the inactivation of Ag2O/TiO2 and investigated the inhibitory effect of the pH of the reaction solution on inactivation. We observed that the photocatalyst’s inactivation was significantly inhibited at pH = 12. Overall, our study clarifies the inactivation mechanism of Ag2O/TiO2 photocatalysts and proposes a method to inhibit inactivation, which could provide valuable references for future research on Ag2O-based photocatalysis.
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