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X-ray diffraction patterns of SiO2 and Ag/SiO 2 composites.EDX spectrum of the obtained Ag/SiO2 composite.SEM images of (a) SiO2 and (b) Ag/SiO2 com-posites.UV-Vis absorption spectra of SiO2 and Ag/SiO2 composites.A simple sketch for the fabrication of SiO2/Ag core-shell composites.C/C0 versus irradiation time plots for MO photodegradation.