Evaluation of methylene blue and riboflavin for the photosensitized degradation of ethylene glycol

Evaluation of methylene blue and riboflavin for the photosensitized degradation of ethylene glycol

Degradation rates ranging from 0.22 ± 0.11 to 1.52 ± 0.50 mg/L-h were measured for ethylene glycol in riboflavin solutions exposed to natural sunlight. Significant degradation rates were noted in systems using 6 and 10 mg/L riboflavin at pH values of 4, 7, and 10. No significant degradation was foun...

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Veröffentlicht in:Environment international 1999-12, Vol.25 (8), p.953-959
Hauptverfasser: McGinnis, B.Dietrick, Adams, V.Dean, Middlebrooks, E.Joe
Format: Artikel
Sprache:eng
Schlagworte:
Applied sciences
ethylene glycol
Exact sciences and technology
General purification processes
methylene blue
Pollution
riboflavin
Wastewaters
Water treatment and pollution
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Zusammenfassung:Degradation rates ranging from 0.22 ± 0.11 to 1.52 ± 0.50 mg/L-h were measured for ethylene glycol in riboflavin solutions exposed to natural sunlight. Significant degradation rates were noted in systems using 6 and 10 mg/L riboflavin at pH values of 4, 7, and 10. No significant degradation was found in systems using methylene blue as the photosensitizing agent. Possible mechanisms for ethylene glycol degradation include a combination hydrogen or electron abstraction by an excited photosensitizer and reaction with singlet oxygen or reaction with superoxide radicals.
ISSN:0160-4120
1873-6750
DOI:10.1016/S0160-4120(99)00065-3