Theoretical and experimental investigations of synthesis and catalytic properties of nano-dispersed titanium oxide photocatalysts modified with spectral sensibilizing additives
DOI:
Keywords:
titanium dioxide, anatase, doping, morphology, diffuse reflectance UV-vis spectra, band gap, photocatalytic activityAbstract
A method of producing doped titanium dioxide of anatase modification of a globular structure is developed, which is thermally stable at a temperature of 600ºC. The method is based on the co-hydrolysis of titanium tetrachloride, and small amounts of cobalt and iron inorganic salts in ammonium medium at room temperature, wherein anatase stabilization occurs through the formation of an intermediate structure Ti-O-Me. It has been found that doping of titanium dioxide by transitional metal ions leads to a shift of the absorption band edge in the diffuse reflectance spectra to the visible region of the spectrum, which is accompanied by a decrease in the value of the band gap. It has been established that the introduction of fluorine into the crystal lattice of titanium dioxide does not lead to a narrowing of the band gap, but helps to stabilize the anatase modification of TiO2 and that the width of the band gap of TiO2-C samples significantly depends on the receiving method and subsequent heat treatment conditions.
References
- Anpo M., Takeuchi M. The design and development of highly reactive titanium oxide photocatalysts operating under visible light irradiation // J. Catal. - 2003. - Vol. 216. - P. 505-516.
- Carp O., Huisman C.L., Reller A. Photoinduced reactivity of titanium dioxide // Progress in Solid State Chemistry. - 2004. - Vol. 32. - P. 33-177.
- Chen D., Jiang Z., Geng J. [et al.] Carbon and nitrogen co-doped TiO2 with enhanced visible-light photocatalytic activity // Ind. Eng. Chem. Res. - 2007. - Vol. 46. - P. 2741-2746.
- Choi W., Termin A., Hoffmann M.R. The role of metal ion dopants in quantumsizes TiO2: correlation between photoreactivity and charge carrier recombination dynamics // J. Phys. Chem. - 1994. - Vol. 98. - P. 13669-13679.
- Ho W., Yu J.C., Lee S. Synthesis of hierarchical nanoporous F-doped TiO2 spheres with visible light photocatalytic activity // Chem. Common. - 2006. - Vol. 1115. - P. 1115-1117.
- Mills A., Hunte Le. An overview of semiconductor photocatalysis // J. Photichem. Photobiol. A: Chemistry. - 1997. - Vol. 108. - P. 1-35.
- Zhang J., Ayusawa T., Minagawa M. [et al.] Investigations of TiO2 photocatalysts for the decomposition of NO in the flow system: the role of pretreatment and reaction conditions in the photocatalytic efficiency // J. Catal. - 2001. - Vol. 198. - P. 1-8.
- Lebedeva I.I., Sizeneva I.P., Celise U.G. [i dr.] Formirovanie i strukturno-fazovye prevrasenia mezoporistyh kserogelej Al2O3 i TiO2 / Al2O3 v gidrotermal’nyh usloviah // Neorganiceskie materialy. - 2016 - T. 52. - No 10. - S. 1073-1080.
- Lebedeva I.I., Sizeneva I.P., Kisel’kov D.M., Val’cifer V.A. Issledovanie vliania dobavok sul’fata ammonia na strukturu i fotokataliticeskuu aktivnost’ dioksida titana // Zurn. prikl. him. - 2014. - T. 87. - Vyp. 5. - S. 554-562.
- Liver E. Elektronnaa spektroskopia neorganiceskih soedinenij. C. 2. - M.: Mir, 1987. - 447 s.
- Sizeneva I.P., Lebedeva I.I., Val’cifer V.A., Strel’nikov V.N. Sposob polucenia mezoporistogo dioksida titana anataznoj modifikacii. Zaavka na patent RF No 2015157160.