Photocatalytic Degradation of DIPA Using Bimetallic Cu-Ni/TiO₂ Photocatalyst under Visible Light Irradiation

Table 1

Assignment of absorption peaks observed in FTIR spectra of bare TiO₂ and Cu-Ni/TiO₂ photocatalysts.

Peaks (cm^−1)	Possible assignment	Related process occurring
1600	H–O–H bending	Physically adsorbed moisture
3400	O–H stretching of hydroxyl group
1384	NO3^− anion	Presence of nitrate