Decolorization of textile basic dye in aqueous solution by ozone


Dyes and Pigments, vol.92, no.3, pp.897-901, 2012 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 92 Issue: 3
  • Publication Date: 2012
  • Doi Number: 10.1016/j.dyepig.2011.07.012
  • Journal Name: Dyes and Pigments
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.897-901
  • Keywords: Ozonation, Methylene Blue, Basic dye, Chemical oxygen demand, Kinetics, Decolorization
  • Istanbul Gelisim University Affiliated: No


In this study, the factors affecting the rate of chemical oxygen demand (COD) of a synthetic waste solution containing a water soluble basic dye [Methylene Blue] were investigated. Decolorization of the dye was achieved by ozonation. The research was conducted using a batch bubble column to take the advantage of the intensive back-mixing that prevails in bubble columns. As a result, the COD of basic dyestuff wastewater was reduced to 64.96% and decolorization was observed under basic conditions (pH 12), complete MB degradation occurring in 12 min. Ozone consumption continued for a further 16 min 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, which increased with both the applied ozone dose and higher pH values, declined logarithmically with the initial dye concentration. © 2011 Elsevier Ltd. All rights reserved.