Photocatalytic degradation of ofloxacin by ZnO/CsxWO3 composite synthesized by two-step method: A kinetic study
Abstract
The composite of ZnO/CsxWO3 with heterojunction was prepared by a two-step solvothermal method and the degradation of ofloxacin solution under full-spectrum light irradiation was carried out to evaluate the performance. The composites were characterized by XRD, SEM, EDS and UV-Vis-NIR reflectance. The result shows that the prepared composite has an ideal optical absorption in the spectral region of 200-2500nm and higher photocatalytic performance compared with ZnO and CsxWO3. Moreover, h+, ṡOH and ṡO2- radicals are determined to be the active species. It is suggested that the heterojunction between ZnO and CsxWO3 for ZnO/CsxWO3 composite is important for improving the charge separation and thus restraining the recombination of photogenerated electrons and holes. Photodegradation of ofloxacin catalyzed by ZnO/CsxWO3 followed the first-order kinetics and the degradation rate of ZnO/2CsxWO3 was about two times higher than those of CsxWO3 and ZnO.
- Publication:
-
Functional Materials Letters
- Pub Date:
- 2019
- DOI:
- 10.1142/S1793604719500681
- Bibcode:
- 2019FML....1250068N
- Keywords:
-
- ZnO/CsxWO<SUB>3</SUB>;
- full-spectrum;
- active species;
- two-step approach