Heterogeneous photo-Fenton oxidation of methylene blue using CdS-carbon nanotube/TiO2 under visible light

Heterogeneous photo-Fenton oxidation of methylene blue using CdS-carbon nanotube/TiO2 under visible light

Heterogeneous photo-Fenton oxidation using CdS/multi-walled carbon nanotube-TiO2 (CdS/MWCNTTiO2)under visible light relied on combination of the photocatalytic, photo-Fenton and photosensitizingoxidation. The photo-Fenton reactions resulted in much faster and higher removal ofmethylene blue and total organic carbon than the dark Fenton oxidation and the photocatalyticdegradation alone at the selected conditions. The optimummolar ratio of [methylene blue]:[H2O2]:[Fe3+](1:12:3.4) in the photo-Fenton oxidation indicated cost-effectiveness of the process. The scavengingtests of the hydroxyl radicals and the valence holes suggested that the hydroxyl radical-driven oxidationwas the major step among the multiple reactions in the photo-Fenton oxidation.

Heterogeneous photo-Fenton oxidation using CdS/multi-walled carbon nanotube-TiO2 (CdS/MWCNTTiO2)under visible light relied on combination of the photocatalytic, photo-Fenton and photosensitizingoxidation. The photo-Fenton reactions resulted in much faster and higher removal ofmethylene blue and total organic carbon than the dark Fenton oxidation and the photocatalyticdegradation alone at the selected conditions. The optimummolar ratio of [methylene blue]:[H2O2]:[Fe3+](1:12:3.4) in the photo-Fenton oxidation indicated cost-effectiveness of the process. The scavengingtests of the hydroxyl radicals and the valence holes suggested that the hydroxyl radical-driven oxidationwas the major step among the multiple reactions in the photo-Fenton oxidation.