Comparison of several advanced oxidation processes for the decolorization of Reactive Red 120 azo dye in aqueous solution

Erdal Kusvuran, Osman Gulnaz, Sibel Irmak, Osman M. Atanur, H. Ibrahim Yavuz, Oktay Erbatur

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204 Scopus citations

Abstract

In this study UV/TiO2, electro-Fenton (EF), wet-air oxidation (WAO), and UV/electro-Fenton (UV/EF) advanced oxidation processes (AOPs) have been applied to degrade Reactive Red 120 (RR120) dye in aqueous solution. The most efficient method on decolorization and mineralization of RR120 was observed to be WAO process. Photocatalytic degradation of RR120 by UV/TiO2 have been studied at different pH values. At pH 3 photocatalytic degradation kinetics of RR120 successfully fitted to Langmuir-Hinshelwood (L-H) kinetics model. The values of second order degradation rate (k″) constant and adsorption constant (K) were determined as 4.525 mg L-1 min -1 and 0.387 L mg-1, respectively. Decolorization efficiency observed in the order of WAO>UV/TiO2=UV/EF>EF while WAO>UV/TiO2>UV/EF>EF order was observed in TOC removal (mineralization). For all AOPs, it was found that degradation products in reaction mixture can be disposed safely to environment after 90 min treatment.

Original languageEnglish (US)
Pages (from-to)85-93
Number of pages9
JournalJournal of Hazardous Materials
Volume109
Issue number1-3
DOIs
StatePublished - Jun 18 2004

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

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