Original scientific paper
Oxidation by-products of the C.I. Direct Blue 106 dye after ozonation
Polonca Lesjak
; Gorenje d.d., Velenje, Slovenia
Maja Bauman
; IOS, Institute for Environmental Protection and Sensors Ltd., Maribor, Slovenia
Mojca Poberžnik
orcid.org/0000-0002-8730-3359
; IOS, Institute for Environmental Protection and Sensors Ltd, Maribor, Slovenia
Mitja Kolar
; University of Maribor, Faculty of Mechanical Engineering, Centre of Sensor Technology, Maribor, Slovenia
Aleksandra Lobnik
; University of Maribor, Faculty of Mechanical Engineering, Centre of Sensor Technology, Maribor, Slovenia
Abstract
The oxidation of the often used oxazine direct dye C.I. Direct Blue 106 (Direct Dye 106) in an aqueous solution (600 mg L-1) by ozonation was investigated. VIS spectra showed degradation of the oxazine groups in the initial Direct Dye 106 structure. The oxidation by-products, such as sulphate, nitrate, nitrite, chloride ions and phenolic compounds, were identified by MS-MS and the LC-MS analyses. After ozonation the wastewater containing the Direct Dye 106 showed no toxic characteristics, according to Daphnia magna test (24 h- EC50 > 75%).
Keywords
ozone; coloured wastewater; C.I. Direct Blue 106; oxazine; oxidation by-products; MS-MS; LC-MS; Daphnia magna toxicity test
Hrčak ID:
142512
URI
Publication date:
12.9.2014.
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