Figure 3

UV–Vis. absorption spectra of the prepared CoxNi1−xFe2O4; x = 0.9/SiO2/TiO2/C-dots nanocomposite, bare C-dots and CoxNi1−xFe2O4; x = 0.9/SiO2/TiO2 nanocomposite.
UV–Vis. absorption spectra of the prepared CoxNi1−xFe2O4; x = 0.9/SiO2/TiO2/C-dots nanocomposite, bare C-dots and CoxNi1−xFe2O4; x = 0.9/SiO2/TiO2 nanocomposite.