Effect of the Heat Treatment Sequence in Forming WO3/SnO2/CuO Nanocomposites on the Photocatalytic Properties Illuminated by UV and Sunlight Irradiation

A heterostructured WO3–SnO2 nanocomposite for the efficient photocatalytic production of H2O2 under visible light

“…23,24 It is consequently seen that composite metal oxides compared of WO 3 and SnO 2 have attracted much attention due to their potentially excellent optical and electrical properties. 3,40,56 Actually, building heterojunctions of two or more semiconductors is one of the strategies to obtain novel photocatalysts, 22,25 and a number of studies have concentrated on the composite oxide systems containing WO 3 and SnO 2 , such as using WO 3 /SnO 2 /CuO for the photocatalytic degradation of methylene blue 26 and pesticides 27 and WO 3 /SnO 2 /TiO 2 for the degradation of polychlorinated biphenyl. 28 It should be noted that the aforementioned catalysts are mainly used in organic degradation processes, whereas the direct use of WO 3 -SnO 2 systems alone for the photocatalytic preparation of hydrogen peroxide is still rarely explored.…”