Microstructures and photocatalytic properties of Ag{sup +} and La{sup 3+} surface codoped TiO{sub 2} films prepared by sol-gel method

Journal Article · Sat Oct 15 04:00:00 EDT 2011 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2011.08.014· OSTI ID:21580036

Nan, Zhao ^[1]; Fang, Li ^[1]; Feipeng, Lou ^[2]

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1. Key Laboratory of Chemical Sensing and Analysis, Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022 (China)
2. China Petroleum Engineering and Construction Corporation, Beijing 100120 (China)

Ag{sup +} and La{sup 3+} surface codoped TiO{sub 2} films were successfully prepared by the improved sol-gel and doping processes. The as-prepared specimens were characterized using differential thermal analysis-thermogravimetry (DTA-TG), X-ray diffraction (XRD), high-resolution field emission scanning electron microscopy (FE-SEM), X-ray energy dispersive spectroscopy (EDS), Brunauer-Emmett-Teller (BET) surface area, Photoluminescence spectrum (PL) and UV-vis diffuse reflectance spectroscopy. The photocatalytic activities of the films were evaluated by degradation of an organic dye in aqueous solution. The results of XRD, FE-SEM and BET analyses indicated that the TiO{sub 2} films were composed of nano-particles or aggregates with a size of less than 10 nm. With the codoping of Ag{sup +} and La{sup 3+}, TiO{sub 2} films with high photocatalytic activity and clearly responsive to the visible light were obtained. The improvement mechanism by ions doping was also discussed. - Graphical Abstract: The PL intensity of Ag{sup +} and La{sup 3+} surface codoped TiO{sub 2} was the lowest among all samples, indicating the recombination of electron and hole was effectively prohibited compared with pure TiO{sub 2}, Ag{sup +} and La{sup 3+} bulk codoped TiO{sub 2}. Highlights: > Ag{sup +} and La{sup 3+} codoping can reduce the crystal size of TiO{sub 2}. > Ag{sup +} and La{sup 3+} surface codoped TiO{sub 2} films have an obvious optical response red-shift. > Ag{sup +} and La{sup 3+} surface codoped TiO{sub 2} films can exhibit excellent photocatalytic activity under both UV and visible light irradiations.

• OSTI ID: 21580036
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 10 Vol. 184; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
AQUEOUS SOLUTIONS
CATALYSIS
CHALCOGENIDES
CHARGED PARTICLES
CHEMICAL ANALYSIS
COHERENT SCATTERING
CRYSTALS
DIFFERENTIAL THERMAL ANALYSIS
DIFFRACTION
DISPERSIONS
ELECTROMAGNETIC RADIATION
ELECTRON MICROSCOPY
EMISSION
FIELD EMISSION
FILMS
GRAVIMETRIC ANALYSIS
HOMOGENEOUS MIXTURES
IONIZING RADIATIONS
IONS
LANTHANUM IONS
LUMINESCENCE
MICROSCOPY
MICROSTRUCTURE
MIXTURES
OXIDES
OXYGEN COMPOUNDS
PHOTOCATALYSIS
PHOTOLUMINESCENCE
PHOTON EMISSION
QUANTITATIVE CHEMICAL ANALYSIS
RADIATIONS
SCANNING ELECTRON MICROSCOPY
SCATTERING
SILVER IONS
SOL-GEL PROCESS
SOLUTIONS
SPECTROSCOPY
SURFACE AREA
SURFACE PROPERTIES
SURFACES
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
VISIBLE RADIATION
X RADIATION
X-RAY DIFFRACTION