Oxidation of Tartrazine with Ultraviolet Light Emitting Diodes: PH and Duty Cycles Effects
Document Type
Article
Publication Date
3-2018
Abstract
The presence of tartrazine (TAR) in the water cycle poses serious threats to human health. This study investigated the used of light emitting diodes (LEDs) in the advanced oxidation of TAR under different pH and duty cycle (DC) conditions. The first order reaction rate constant for TAR oxidation was positively correlated with DC, negatively correlated with pH, and typically greatest at pH 6. Chemical byproduct analysis indicated that OH addition, H abstraction, and electron transfer without molecule transfer were among the relevant reaction mechanisms for TAR degradation. Six byproducts were identified, four were reported for the first time, and two demonstrated that TAR rings were cleaved. This research is the first to determine the optimal pH for UVLED-driven oxidation of TAR and the first to identify new TAR-related byproducts from UVLED-based water treatment.
DOI
10.2166/wst.2018.045
Source Publication
Water Science & Technology
Recommended Citation
Brandon M. Stewart, Michael E. Miller, David M. Kempisty, John Stubbs, Willie F. Harper; Oxidation of tartrazine with ultraviolet light emitting diodes: pH and duty cycles effects. Water Sci Technol 29 March 2018; 77 (6): 1651–1659. doi: https://doi.org/10.2166/wst.2018.045
Comments
The "Link to Full Text" button on this page loads the freely accessible article version of record, hosted at IWA. The publisher retains permissions to re-use and distribute this article.