Photocatalytic degradation of methyl orange on the novel hetero-system La2NiO4/ZnO under solar light
Abstract
Complete photocatalytic degradation of methyl orange (MO) was obtained in 60 min on the II-type hetero-system La2NiO4/ZnO, prepared by an impregnation method. The band gap of La2NiO4 and ZnO are 1.87 and 3.10 eV, respectively, with a direct optical transition. The position of the conduction and the valence band in the energy diagram confirms the formation of the II-type hetero-junction, thus facilitating the photo-degradation of MO. The kinetics of MO degradation obeys to the first order apparent reaction with a rate constant of 0.022 min-1. The reutilization of the hetero-system was studied with high removal efficiency after three photocatalysis runs.
- Publication:
-
Chemical Physics Letters
- Pub Date:
- March 2020
- DOI:
- 10.1016/j.cplett.2020.137132
- Bibcode:
- 2020CPL...74237132L
- Keywords:
-
- Impregnation method;
- La<SUB>2</SUB>NiO<SUB>4</SUB>/ZnO;
- Methyl orange;
- Photocatalytic degradation;
- Solar light