Performance of NiFe₂O₄-SiO₂-TiO₂ Magnetic Photocatalyst for the Effective Photocatalytic Reduction of Cr(VI) in Aqueous Solutions

Figure 3

FTIR spectra of (a) NiFe₂O₄-TiO₂ and (b) NiFe₂O₄-SiO₂-TiO₂ photocatalysts.