Effect of amines on the peroxo-titanates and photoactivity of annealed TiO2 |
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| Institution: | 1. Institute of Inorganic Chemistry of the Czech Academy of Sciences, 250 68 Husinec-?e?, Czech Republic;2. University of Ostrava, Department of Chemistry, 30. dubna 22, 701 03 Ostrava, Czech Republic;3. Institute of Chemical Technology, Prague, Department of Metals and Corrosion Engineering, Technická 5, 166 28 Prague 6, Czech Republic;4. Faculty of Science, J. E. Purkyne University, Pasteurova 1, 400 96 Ústí nad Labem, Czech Republic;5. Institute of Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinského 9, 812 37 Bratislava, Slovak Republic;6. Jaroslav Heyrovský Institute of Physical Chemistry of the Czech Academy of Sciences, Dolej?kova 2155/3, 182 23, Praha 8, Czech Republic |
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| Abstract: | The aim of this study was to explore the influence of various n-propylamines (mono, di, and tri) and tert-butylamine on the properties of prepared peroxo-titanates and annealed TiO2. Detailed structural characterization (SEM, TEM with EDX, XRD) confirmed the 2D-foil morphology of TiO2 nanocrystals and the CHNS analysis together with XPS showed presence of carbon (under 1 wt%). The annealed TiO2 showed excellent photocatalytic activity and up to four times higher decomposition rate constant upon UV irradiation than the P25. Favourable growth of TiO2 crystals was observed especially when propylamine and tert-butylamine were used (as precursors for the peroxo-titanates). Increased photocatalytic efficiency of the highly crystalline nano-TiO2 was confirmed due to high-reactive anatase facets and the morphology composed of microsheets formed by interconnected nanocrystals. The photoinduced electron transfer was confirmed via EPR spectroscopy. This synthesis’ procedure offers a novel preparation method of highly photoactive C-doped TiO2 achieved relatively easily after annealing of lyophilized amino-peroxo-titanate. |
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| Keywords: | Peroxo-titanates Amines Photoactivity Photocatalyst |
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