| Autor: |
Sérgio R. Teixeira, Daniel Eduardo Weibel, Jairton Dupont, Renato V. Gonçalves, G. Nagaraju, Gunter Ebeling |
| Rok vydání: |
2013 |
| Předmět: |
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| Zdroj: |
Journal of Molecular Catalysis A: Chemical. 378:213-220 |
| ISSN: |
1381-1169 |
| DOI: |
10.1016/j.molcata.2013.06.010 |
| Popis: |
TiO 2 nanoparticles and TiO 2 –RGO (reduced graphene oxide) composite were synthesized by ionothermal method at 100 and 120 °C for 24 h using two different ionic liquids (ILs), 1-(2-methoxyethyl)-3-methylimidazolium methanesulfonate (IL1) and 1-(2-methoxyethyl)-3-methylimidazolium tetrafluoroborate (IL2). BET surface area analysis of the composites showed surface areas of 170 and 161 m 2 g −1 for TiO 2 and TiO 2 –RGO composite respectively. TEM images show that the sizes of the particles are around 4 nm and in the composite clearly show that TiO 2 NPs are present on the surface of the graphene sheet. The use of IL2 produces a high crystalline TiO 2 NPs with pure anatase phase without need of thermal treatment (TT). Hydrogen generation by UV light on TiO 2 NPs or TiO 2 –RGO composite prepared in ILs without thermal treatment (TT) show lower rate than TiO 2 P25. After TT at 400 °C a higher H 2 production rate (up to 0.76 mmol h −1 g −1 ) due to the increase in crystallinity was measured. The photocatalytic activity was further enhanced for TiO 2 –RGO composite. The electron-accepting and electron-transporting properties of graphene in the composite could indeed suppress the charge recombination and improve their photocatalytic activities. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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Full Text from ScienceDirect