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Evaluation of UV LEDs Performance in Photochemical Oxidation of Phenol in the Presence of H2O2.

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Title: Evaluation of UV LEDs Performance in Photochemical Oxidation of Phenol in the Presence of H2O2.
Authors: Vilhunen, Sari1 sari.vilhunen@uku.fi, Rokhina, Ekaterina V.2 katja.rokhina@uku.fi, Virkutyte, Jurate3 jurate.virkutyte@uku.fi
Source: Journal of Environmental Engineering. Mar2010, Vol. 136 Issue 3, p274-280. 7p. 4 Charts, 3 Graphs.
Subjects: Phenol, Light emitting diodes, Ultraviolet radiation, Oxidation, Photochemical oxidants, Hydrogen peroxide
Abstract: A novel application of ultraviolet (UV) light emitting diodes (LEDs) as a light source for the degradation of organic contaminant has been investigated. Photocleaving of hydrogen peroxide (H2O2) via UV LEDs photolysis resulted in the generation of hydroxyl radicals. It was found that phenol removal was insignificant in the absence of hydrogen peroxide, therefore oxidation of phenol was attributed to the formed radicals. Two criteria were selected to provide detailed information on the performance of UV LEDs in phenol oxidation: (1) the reaction quantum efficiency and (2) the energy consumption. Statistical tools such as the response surface methodology and the ANOVA were applied to estimate the influence of various process parameters such as the wavelength (255, 269, and 276 nm) and H2O2 to phenol molar ratio (5, 50, and 100) on phenol degradation reaction quantum efficiency. The decay of phenol (initial concentration of 1.06 mM) was the most pronounced at 255 nm and H2O2 to phenol molar ratio of 50. Finally, the “figure-of-merit” was used to estimate the specific energy consumption of the UV LED-based process. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:A novel application of ultraviolet (UV) light emitting diodes (LEDs) as a light source for the degradation of organic contaminant has been investigated. Photocleaving of hydrogen peroxide (H2O2) via UV LEDs photolysis resulted in the generation of hydroxyl radicals. It was found that phenol removal was insignificant in the absence of hydrogen peroxide, therefore oxidation of phenol was attributed to the formed radicals. Two criteria were selected to provide detailed information on the performance of UV LEDs in phenol oxidation: (1) the reaction quantum efficiency and (2) the energy consumption. Statistical tools such as the response surface methodology and the ANOVA were applied to estimate the influence of various process parameters such as the wavelength (255, 269, and 276 nm) and H2O2 to phenol molar ratio (5, 50, and 100) on phenol degradation reaction quantum efficiency. The decay of phenol (initial concentration of 1.06 mM) was the most pronounced at 255 nm and H2O2 to phenol molar ratio of 50. Finally, the “figure-of-merit” was used to estimate the specific energy consumption of the UV LED-based process. [ABSTRACT FROM AUTHOR]
ISSN:07339372
DOI:10.1061/(ASCE)EE.1943-7870.0000152