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

https://hrcak.srce.hr/142512

Publication date:

12.9.2014.

Article data in other languages: croatian

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