naa a22 4500 510748759 CHVBK 20180411083056.0 cr unu---uuuuu 180411e20130101xx s 000 0 eng 10.1007/s11270-012-1353-8 doi (NATIONALLICENCE)springer-10.1007/s11270-012-1353-8 Decolorization and Degradation of Reactive Dye in Aqueous Solution by Ozonation in a Semi-batch Bubble Column Reactor [Elektronische Daten] [Kadir Turhan, S. Ozturkcan] The decolorization and degradation of anionic sulphonated azo dye (Reactive orange 16 (RO16)), which is suspected to be carcinogenic, were investigated using ozone. The decolorization process of the reactive dye was carried out by bubbling ozone at the bottom of a bubble column reactor containing the dye solution. The effect of pH, reaction time, dye concentration, ozone concentration, and decolorization time was studied. Also, degradation products and possible degradation mechanism were investigated. The results showed that ozonation was a highly effective way to remove color from wastewater. The color of a synthetic waste solution containing water-soluble reactive dye was reduced to 69.69% under the basic condition (pH12), with complete RO16 degradation occurring in 8min. Ozone consumption continued for a further 16min after which time most of the degradation reactions were complete. Kinetic studies showed that direct ozonation of the aqueous dyes represented a pseudo-first-order reaction with respect to the dye. The apparent rate constant increased with both the applied ozone dose and higher pH values and declined logarithmically with the initial dye concentration. Intermediates such as 6-acetylamino-3-aminonaphthalene-2-sulfonic acid, 2-(4-nitrosophenyl) sulfonylethyl hydrogen sulfate, and 6-acetamido-4-hydroxy-3-nitroso naphthalene-2-sulfonic acid were detected by gas chromatograph coupled with mass spectrometry in the absence of pH buffer, while nitrate and sulfate ions and formic, acetic, and oxalic acids were detected by ion chromatography. Springer Science+Business Media Dordrecht, 2012 Ozonation nationallicence Reactive orange 16 nationallicence Chemical oxygen demand nationallicence Kinetics nationallicence Decolorization nationallicence Turhan Kadir Yildiz Technical University, Department of Chemistry, Esenler, 34210, Istanbul, Turkey aut Ozturkcan S. Yildiz Technical University, Department of Chemistry, Esenler, 34210, Istanbul, Turkey aut Water, Air, & Soil Pollution Springer Netherlands 224/1(2013-01-01), 1-13 0049-6979 224:1<1 2013 224 11270 https://doi.org/10.1007/s11270-012-1353-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11270-012-1353-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Turhan Kadir Yildiz Technical University, Department of Chemistry, Esenler, 34210, Istanbul, Turkey aut NATIONALLICENCE 700 1- Ozturkcan S. Yildiz Technical University, Department of Chemistry, Esenler, 34210, Istanbul, Turkey aut NATIONALLICENCE 773 0- Water, Air, & Soil Pollution Springer Netherlands 224/1(2013-01-01), 1-13 0049-6979 224:1<1 2013 224 11270 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer