Photocatalytic degradation of pentachlorophenol on ZnSe/TiO2 supported by photo-Fenton system

摘要

In this research, a photocatalyst is prepared by pulse-electrodeposition of ZnSe nanopartides of 2.7 eV bandgap onto the surface of TiO2 nanotube array films. Under AM 1.5G illumination the ZnSe sensitized TiO2 nanotube arrays (ZnSe/TiO2 NTAs) exhibit a significantly increased capability for photocatalytic degradation of pentachlorophenol with support of photo-Fenton system (Fe~(3+)/H2O2/humic acid) which is investigated as oxidants. After 2 h illumination 99.0% of pentachlorophenol is removed, compared to 64.0% using the non-sensitized TiO2 NTAs. The studied concentration of Fe~(3+), H2O2, humic acid in photo-Fenton system were 100 μM Fe~(3+), 75 μM H2O2, 220 μM, respectively. The initial concentration and stability were investigated to be important factors that influence the photocatalytic degradation and catalytic ability.