Characterization and activity of visible-light-driven TiO{sub 2} photocatalyst codoped with nitrogen and cerium
- Department of Environmental Engineering, Jinan University, Guangzhou 510632 (China)
- State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085 (China)
Nitrogen and cerium codoped TiO{sub 2} photocatalysts were prepared by a modified sol-gel process with doping precursors of cerium nitrate and urea, and characterized by X-ray diffraction (XRD), thermogravimetry-differential scanning calorimetry (TG-DSC), X-ray photoelectron spectra (XPS) and ultraviolet-visible light diffuse reflectance spectra (UV-vis DRS). Results indicate that anatase TiO{sub 2} is the dominant crystalline type in as-prepared samples, and CeO{sub 2} crystallites appear as the doping ratio of Ce/Ti reaches to 3.0 at%. The TiO{sub 2} starts to transform from amorphous phase to anatase at 987.1 K during calcination, according to the TG-DSC curves. The XPS show that three major metal ions of Ce{sup 3+}, Ce{sup 4+}, Ti{sup 4+} and one minor metal ion of Ti{sup 3+} coexist on the surface. The codoped TiO{sub 2} exhibits significant absorption within the range of 400-500 nm compared to the non-doped and only nitrogen-doped TiO{sub 2}. The enhanced photocatalytic activity of the codoped TiO{sub 2} is demonstrated through degradation of methyl orange under visible light irradiation. - Graphical abstract: A novel TiO{sub 2} photocatalyst codoped with nitrogen and cerium was synthesized and characterized. An enhanced visible light activity was achieved. UV-vis DRS results indicated that the optical absorption edge of the N-Ce codoped TiO{sub 2} was obviously shifted to the visible light range as the Ce/Ti doping ratio increased.
- OSTI ID:
- 21128264
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 4 Vol. 181; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ABSORPTION
AMORPHOUS STATE
CALCINATION
CALORIMETRY
CERIUM IONS
CERIUM NITRATES
CERIUM OXIDES
DOPED MATERIALS
IRRADIATION
NITROGEN
PHOTOCATALYSIS
PRECURSOR
SOL-GEL PROCESS
SPECTRA
THERMAL GRAVIMETRIC ANALYSIS
TITANIUM IONS
TITANIUM OXIDES
X-RAY DIFFRACTION
X-RAY PHOTOELECTRON SPECTROSCOPY