Figure 4: XRD patterns of (a) TiO2, (b) SiO2, (c) SiO2@TiO2 core-shell particles, (d) 1 wt.% Ag-coated SiO2@TiO2 photocatalysts, (e) 3 wt.% Ag-coated SiO2@TiO2 photocatalysts, (f) 6 wt.% Ag-coated SiO2@TiO2 photocatalysts, and (g) 9 wt.% Ag-coated SiO2@TiO2 photocatalysts.