One-step hydrothermal synthesis of Bi-TiO2 nanotube/graphene composites: An efficient photocatalyst for spectacular degradation of organic pollutants under visible light irradiation
| Autor: | M. Muneer, Imme Kretschmer, Umair Alam, Manuel Fleisch, Detlef W. Bahnemann |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Aqueous solution Graphene Process Chemistry and Technology chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Catalysis Hydrothermal circulation 0104 chemical sciences law.invention Bismuth chemistry law Photocatalysis Hydrothermal synthesis Fourier transform infrared spectroscopy Composite material 0210 nano-technology General Environmental Science Visible spectrum |
| Zdroj: | Applied Catalysis B: Environmental. 218:758-769 |
| ISSN: | 0926-3373 |
| DOI: | 10.1016/j.apcatb.2017.06.016 |
| Popis: | In the present study, we have adopted a simple one-pot alkaline hydrothermal route to synthesize Bi-doped TiO2NT/graphene composites by using different wt% of Bi with an aim to achieve the excellent photocatalytic activity under visible light source. The nature of GO is changed to deoxygenated graphene with simultaneous embedding of Bi into TiO2 nanotube (TNT), during hydrothermal process. XRD and FTIR analysis confirm the successful conversion of GO to deoxygenated graphene. EPR analysis reveals the co-existence of Ti3+ ion with oxygen vacancy, which is created by the Bi doping. The photocatalytic activity of the prepared samples is measured by the degradation of aqueous suspensions of methylene blue (MB) and Dinoseb (phenolic herbicide), under visible-light irradiation. The prepared TiO2NT/graphene composite with 2-wt% bismuth (2-BTNTG) has shown the improved photocatalytic activity as compared to their counterparts. The improved photocatalytic activity is associated to the synergistic effect of graphene and Bi-TNT, which facilitate the interfacial charge transfer and enhances the efficiency of light harvesting in the visible region. Moreover, the underlying mechanism involving photocatalytic degradation of organic pollutants over 2-BTNTG is explored by using trapping experiments, suggesting that the .OH radicals solely contributed to degradation. |
| Databáze: | OpenAIRE |
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