| Autor: |
Lauryn C. Hansen, Harikrishnan Jayamohan, Swomitra K. Mohanty, Mano Misra, Bruce K. Gale, York R. Smith |
| Rok vydání: |
2015 |
| Předmět: |
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| Zdroj: |
Applied Catalysis B: Environmental. :167-175 |
| ISSN: |
0926-3373 |
| Popis: |
Microfluidic photocatalytic reactors have advantages over conventional bulk reactors such as large surface-area-to-volume ratio and high control of fluid flow. Although titania nanotubular arrays (TNA) have shown enhanced photocatalytic degradation compared to nanoparticle films in a batch reactor configuration, their application in a microfluidic format has yet to be explored. The photocatalytic performance of a microfluidic reactor with TNA catalyst was compared with the performance of microfluidic format with TiO 2 nanoparticulate (commercial P25) catalyst. The microfluidic device was fabricated using non-cleanroom based soft lithography, making it suitable for economical large scale manufacturing. The photocatalytic performance was evaluated at different flow rates ranging from 25 to 200 μL/min. The TNA microfluidic system demonstrated enhanced photocatalytic performance over microfluidic TiO 2 nanoparticulate layers, especially at higher flow rates (50–200 μL/min). For instance, 12 μm long TNA was able to achieve 82% fractional conversion of 18 mM methylene blue in comparison to 55% conversion in case of the TiO 2 nanoparticulate layer at a flow rate of 200 μL/min. A computational model of the microfluidic format was developed to evaluate the effect of diffusion coefficient and rate constant on the photocatalytic performance. The improved performance of the TNA photocatalyst over the nanoparticle film can be attributed to higher generation of oxidizing species. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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Full Text from ScienceDirect