Ag 2 S 2 O 7 /Ag 2 O纳米颗粒异质结构的制备及其太阳光全光谱光催化降解应用

Abstract Ag 2 O has attracted much recent attention, because of its high photocatalytic activity in the ultraviolet (UV)-visible region. However, there have been few reports on the near-infrared (NIR) photocatalytic activity of Ag 2 O. This paper reports the high NIR photocatalytic activity of Ag 2 O nanoparticles. Ag 2 O is unsuitable for application in full-solar-spectrum photocatalysis, because it is unstable under UV irradiation. A surface sulfurization process was carried out to address this issue. Specifically, a layer of Ag 2 S 2 O 7 nanoparticles was grown on the surface of the Ag 2 O nanoparticles, to improve the stability of the Ag 2 O photocatalyst and enhance its photocatalytic activity in the UV, visible and NIR regions. The Ag 2 O/Ag 2 S 2 O 7 heterostructure is a stable and efficient full-solar-spectrum photocatalyst. It has potential application in the photodegradation of organic pollutants, and more generally in environmental engineering where full utilization of the solar spectrum is required.