All photocatalysts were fully characterized by Brunauer–
Emmett–Teller (BET), ultraviolet visible light (UV–vis)
spectroscopy, X-ray diffraction (XRD), transmission electron
microscopy (TEM), and X-ray photoelectron spectroscopy (XPS)
to reveal their structure, surface morphology and chemical state
of the species. The specific surface areas of Pt/CuAlGaO4, Pt/
SrTiO3:Rh and WO3, were approximately 2.10, 3.98 and
4.01 m2 g1, respectively