Photocatalytic Degradation of DIPA Using Bimetallic Cu-Ni/TiO₂Photocatalyst under Visible Light Irradiation

Abstract

Bimetallic Cu-Ni/TiO 2 photocatalysts were synthesized using wet impregnation (WI) method with TiO 2 (Degussa-P25) as support and calcined at different temperatures (180, 200, and 300°C) for the photodegradation of DIPA under visible light. The photocatalysts were characterized using TGA, FESEM, UV-Vis diffuse reflectance spectroscopy, fourier transform infrared spectroscopy (FTIR) and temperature programmed reduction (TPR). The results from the photodegradation experiments revealed that the Cu-Ni/TiO 2 photocatalysts exhibited much higher photocatalytic activities compared to bare TiO 2 . It was found that photocatalyst calcined at 200°C had the highest photocatalyst activities with highest chemical oxygen demand (COD) removal (86.82%). According to the structural and surface analysis, the enhanced photocatalytic activity could be attributed to its strong absorption into the visible region and high metal dispersion.