How porous periodicity of mesoporous materials like TiO2-SBA-15-10 encourages photocatalytic degradation of rhodamine B: a comparative study with aperiodic TiO2-SiO2-aerogel-10
| Autor: | Pandiyan Thangarasu, Ranjit T. Koodali, Balaranjan Selvaratnam, Viviana Palos Barba |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Bioengineering Aerogel 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Atomic and Molecular Physics and Optics 0104 chemical sciences Rhodamine chemistry.chemical_compound Adsorption chemistry Chemical engineering Modeling and Simulation Photocatalysis Rhodamine B Degradation (geology) General Materials Science Diffuse reflection 0210 nano-technology Mesoporous material |
| Zdroj: | Journal of Nanoparticle Research. 23 |
| ISSN: | 1572-896X 1388-0764 |
| DOI: | 10.1007/s11051-021-05148-x |
| Popis: | Discovery of new photocatalytic materials that can efficiently degrade organic contaminants is of great interest. In the present work, TiO2 was spatially dispersed over two siliceous mesoporous supports, SBA-15, representing an example of a material with periodic and ordered array of pores and SiO2-aerogel-10, as an example of an aperiodic material with random network of hierarchical pores. The resulting materials, TiO2-SBA-15-10 and TiO2-SiO2-aerogel-10, were characterized comprehensively by several analytical methods and their photocatalytic performance was evaluated by examining the oxidation of rhodamine B dye under visible light irradiation. The adsorption of rhodamine B was enhanced in TiO2-SBA-15-10 in comparison to TiO2-SiO2-aerogel-10. In diffuse reflection spectra (DRS), the presence of Ti4+ in tetrahedral geometry was observed to be higher for TiO2-SBA-15-10 sample. Thus, in the photocatalytic degradation study, a significant enhancement in the oxidation of rhodamine B dye was observed for TiO2-SBA-15-10 in comparison to TiO2-SiO2-aerogel-10. The formation of oxidation intermediates was analyzed by electrospray ionization-mass spectrometry (ESI-MS) indicating degradation of rhodamine B. This study illustrates the importance of the coordination of the Ti4+ in enhancing photocatalytic degradation of model dye pollutants such as rhodamine B. |
| Databáze: | OpenAIRE |
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