Cobalt and sulfur co-doped TiO2 nanostructures with enhanced photo-response properties for photocatalyst
Abstract
Cobalt (Co) and sulfur (S) co-doped titanium dioxide (TiO2) catalysts were synthesized via sol-gel method. The structure of TiO2was characterized by X-ray diffraction (XRD) and transmission electron microscope (TEM). The valence states of elements were studied by X-ray photoelectron spectroscopy (XPS), and the optical-absorption properties of the catalysts were tested using the ultraviolet-visible (UV-Vis) spectrophotometer. The results showed that the grain sizes of Co and S co-doped TiO2 decreased with the increase of Co and S doping concentration within a certain range, and then the catalysts had obvious red shift on the absorption of visible light. Sample (2%Co-5%S-TiO2) showed excellent light absorption characteristics and the photo-response threshold increased significantly to about 760nm. Also, the further degradation test under visible light shows the 2%Co-5%S-TiO2 sample exhibit apparently improved degradation efficiency for Rhodamine B compared to the undoped one.
- Publication:
-
Functional Materials Letters
- Pub Date:
- 2017
- DOI:
- 10.1142/S1793604717500618
- Bibcode:
- 2017FML....1050061J
- Keywords:
-
- Co-doped TiO<SUB>2</SUB>;
- sol–gel;
- optical absorption properties;
- red shift;
- degradation