title: Advanced Oxidation of Tartrazine and Brilliant Blue with Pulsed Ultraviolet Light Emitting Diodes.
abstract: 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.
authors.forename: Robert
authors.initials: R
authors.lastname: Scott
authors.forename: Patrick
authors.initials: P
authors.lastname: Mudimbi
authors.forename: Michael E
authors.initials: ME
authors.lastname: Miller
authors.forename: Matthew
authors.initials: M
authors.lastname: Magnuson
authors.forename: Stuart
authors.initials: S
authors.lastname: Willison
authors.forename: Rebecca
authors.initials: R
authors.lastname: Phillips
authors.forename: Willie F
authors.initials: WF
authors.lastname: Harper
mesh_terms: D001557:Benzenesulfonates / Q000737:chemistry* / Q000528:radiation effects; D002384:Catalysis; D004396:Coloring Agents / Q000737:chemistry* / Q000528:radiation effects; D006861:Hydrogen Peroxide / Q000737:chemistry*; D010084:Oxidation-Reduction; D010782:Photolysis; D013645:Tartrazine / Q000737:chemistry* / Q000528:radiation effects; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000528:radiation effects
chemical_list: D001557:Benzenesulfonates; D004396:Coloring Agents; D014874:Water Pollutants, Chemical; D006861:Hydrogen Peroxide; C006796:brilliant blue; D013645:Tartrazine