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Advanced Oxidation of Tartrazine and Brilliant Blue with Pulsed Ultraviolet Light Emitting Diodes
Author(s) -
Scott Robert,
Mudimbi Patrick,
Miller Michael E.,
Magnuson Matthew,
Willison Stuart,
Phillips Rebecca,
Harper Willie F.
Publication year - 2017
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143016x14733681696167
Subject(s) - tartrazine , duty cycle , chemistry , degradation (telecommunications) , hydrogen peroxide , light emitting diode , reaction rate constant , diode , ultraviolet , effluent , aeration , materials science , kinetics , optoelectronics , chromatography , environmental engineering , environmental science , power (physics) , organic chemistry , thermodynamics , physics , quantum mechanics , telecommunications , computer science
This study investigated the effect of ultraviolet light‐emitting diodes (UVLEDs) coupled with hydrogen peroxide as an advanced oxidation process (AOP) for the degradation of two test chemicals. Brilliant Blue FCF consistently exhibited greater degradation than tartrazine, with 83% degradation after 300 minutes at the 100% duty cycle compared with only 17% degradation of tartrazine under the same conditions. These differences are attributable to the structural properties of the compounds. Duty cycle was positively correlated with the first‐order rate constants (k) for both chemicals but, interestingly, negatively correlated with the normalized first‐order rate constants (k/duty cycle). Synergistic effects of both hydraulic mixing and LED duty cycle were manifested as novel oscillations in the effluent contaminant concentration. Further, LED output and efficiency were dependent upon duty cycle and less efficient over time perhaps due to heating effects on semiconductor performance.