XRD analysis is conducted to reveal the crystalline of all
photocatalysts, as illustrated in Fig. 2 The loading of Pt obviously
does not change the XRD pattern of the support, namely
SrTiO3:Rh [27] and CuGaAlO4 [26]. This is due to the fact that Pt
loading is very small and highly dispersed on the supported surface.
For commercial WO3, the resulted XRD pattern is similar to
that of orthorhombic WO3 (JCPDS file 20-1324