A comparison of several nanoscale photocatalysts in the degradation of a common pollutant using LEDs and conventional UV light |
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Authors: | Jyoti P Ghosh Ruohong Sui Cooper H Langford Gopal Achari Curtis P Berlinguette |
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Affiliation: | aDepartment of Civil Engineering, University of Calgary, 2500 University Drive, Calgary, Alberta T2N 1N4, Canada;bDepartment of Chemistry, University of Calgary, 2500 University Drive, Calgary, Alberta T2N 1N4, Canada |
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Abstract: | A comparative study on the photocatalytic activities of four different catalysts, P-25 TiO2, TiO2 nanofibers, tin-doped TiO2 nanofibers under UV light irradiation at 350 nm, and coumarin (C-343) coated TiO2 nanofibers at 436 nm light emitting diodes (LED) is reported. Catalysts performance has been compared based on their reflectance spectrum and activity. A common water contaminant 4-chlorophenol was used as a substrate to compare the activity of the different catalysts under both direct and dye sensitized conditions. Results indicated that amongst the four different catalysts the activity of P-25 was the highest. However the activity of C-343 coated TiO2 nanofibers in the LED (436 nm) based reactor was competitive. Identification of reaction intermediates implied that the reaction pathways under UV (band gap) and visible (dye sensitized) irradiation were different. Nonetheless, ring opening took place in all reactions with both maleic and dihydroxymaleic have been identified as intermediates. The study indicates that ordered arrays of TiO2 irradiated by panels of arrays of low cost high intensity LEDs might be used for the design of reactors. The near monochromaticity, long life, and operation under direct currents are advantages of using LEDs. |
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Keywords: | Photocatalysis LED UV Nanofibers 4-Chlorophenol Titanium dioxide Coumarin-343 |
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