Influence of neodymium ions on photocatalytic activity of TiO₂ synthesized by sol–gel and precipitation methods
2011
Hewer, T.L.R. | Souza, E.C.C. | Martins, T.S. | Muccillo, E.N.S. | Freire, R.S.
Titanium dioxide with and without the addition of neodymium ions was prepared using sol–gel and precipitation methods. The resulting catalysts were characterized by thermal analysis, X-ray diffraction and BET specific surface area. Neodymium addition exerted a remarkable influence on the phase transition temperature and the surface properties of the TiO₂ matrix. TiO₂ samples synthesized by precipitation exhibit an exothermic event related from the amorphous to anatase phase transition at 510°C, whereas in Nd-doped TiO₂ this transition occurred at 527°C. A similar effect was observed in samples obtained using sol–gel method. The photocatalytic reactivity of the catalysts was evaluated by photodegradation of Remazol Black B (RB) under ultraviolet irradiation. Nd-doped TiO₂ showed enhanced photodegradation ability compared to undoped TiO₂ samples, independent of the method of synthesis. In samples obtained by sol–gel, RB decoloration was enhanced by 16% for TiO₂ doped with 0.5% neodymium ions.
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