Hierarchically structured bentonite loaded Bi2O3-ZnO and its multiple applications
| Autor: | J. Raghava Rao, E.T. Deva Kumar, Meenakshisundaram Swaminathan, K. Thirumalai, R. Aravindhan |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Photoluminescence
Materials science Diffuse reflectance infrared fourier transform Energy-dispersive X-ray spectroscopy General Physics and Astronomy Mineralogy 02 engineering and technology Surfaces and Interfaces General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Field electron emission Chemical engineering Transmission electron microscopy Photocatalysis 0210 nano-technology Spectroscopy Powder diffraction |
| Zdroj: | Surfaces and Interfaces. 5:30-38 |
| ISSN: | 2468-0230 |
| Popis: | Bentonite Supported Bi2O3-ZnO (BB-ZnO) has been successfully prepared through hydrothermal-thermal decomposition route. The experimental results reveal that 9wt% of Bentonite loaded Bi2O3-ZnO exhibited the superior photocatalytic activity for the degradation of azo dyes (Rhodamine-B (Rh-B) , Acid Black 1 (AB 1) and Trypan Blue (TB)) under UV light far exceeding those of Bi2O3-ZnO, ZnO and Bi2O3. This heterogeneous catalyst was characterized by X–ray powder diffraction (XRD), field emission scanning electron microscopy (FE–SEM), energy dispersive spectroscopy (EDS), elemental color mapping, field emission transmission electron microscopy (FE–TEM), Photoluminescence spectroscopy (PL) and UV–Vis diffuse reflectance spectroscopy (DRS). The FESEM images reveal that most of the nanoflakes are linked together by an edge-to-flat-surface conjunction. It is evident from the elemental mapping studies that Zn, O and Bi are higher in concentration and there is even dispersion of Zn, O, Bi, Si, Al, Fe, Ti, Mg and Na. The FETEM images indicate the uniform distribution of elements and predict the close interaction within oxides, where particles appear as spherical and hexagonal shapes. As synthesized Bentonite loaded Bi2O3-ZnO possesses high reusability without noticeable loss of photoactivity up to four runs. Significant hydrophobicity of Bentonite-Bi2O3-ZnO leads to its self-cleaning property. Bentonite-Bi2O3-ZnO shows electrocatalytic activity for methanol oxidation in alkaline medium, which is higher than Bi2O3-ZnO and pure ZnO. This hierarchically heterostructured nanophotocatalyst can have considerable impact on the future development of highly competent photocatalysts for dye degradation, self-cleaning and electrocatalytic applications. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect