“…5a shows wide-X-ray diffraction patterns (WXRD) of G-SBA, SBA/CuO, SBA/ZnO, and SBA/CuZnO, where all samples exhibit a wide peak at 2q values of 23.0 due to the non-crystalline silica. [39][40][41] Compared to SBA-3, SBA/ZnO diffractogram exhibits no other crystal peaks, which means that they are present in non-crystalline small clusters of ZnO. For SBA/CuO and SBA/ CuZnO mesoporous silica compositions, except for the broad diffuse peak of SBA-3, two extra characteristic peaks can be observed at 2q values of 35.5 and 38.7 , corresponding to the (À111) and (111) reections, respectively.…”