Journal
JOURNAL OF ENVIRONMENTAL MANAGEMENT
Volume 113, Issue -, Pages 426-431Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2012.10.008
Keywords
UV/H2O2 process; Dye degradation; Dyeing auxiliaries; Carbonate radical; Color removal
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The effect of dyeing auxiliaries on UV/H2O2 removal of an indigoid dye, Acid Blue 74 (AB74) from the solution was investigated. The inhibition effect of anions including carbonate, bicarbonate and chloride on the process efficiency was evaluated in terms of color removal and total organic carbon (TOC) abatement. The presence of carbonate, bicarbonate and chloride anions had no considerable effect on the total decolorization time. However, the degradation efficiency of the process was enhanced by bicarbonate anion during the first 80 min of the process. During this period, the formation of active oxygen species such as CO3 center dot-, HCO4- and O-2(center dot-) that participate in the degradation process of AB74 increases the degradation rate, in spite of the consumption of hydroxyl radicals by these anions. After this period, the overall efficiency was considerably decreased. Adding the chloride had less decreasing effect compared to the bicarbonate. The order of anions as AB74 degradation inhibitor in this study could be concluded as: Cl- < HCO3- approximate to (HCO3- + Cl-). (C) 2012 Elsevier Ltd. All rights reserved.
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