Degradation of azo dyes using low iron concentration of Fenton and Fenton-like system

C. L. Hsueh, Y. H. Huang, C. C. Wang, C. Y. Chen

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401 Citations (Scopus)

Abstract

This study investigated Fenton and Fenton-like reactions at low iron concentration (≦10 mg l-1) to oxidize three commercial azo dyes, namely Red MX-5B, Reactive Black 5 and Orange G. In some local cases in Taiwan, wastewater color was found to be the only problem in meeting local effluent standards. This investigation reveals that both of these methods can remove the color of these dyes completely. Moreover they only produce little sludge in wastewater that meet local effluent standards and do not need to further treat. The effects of Fe2+, Fe3+, H2O2 and solution pH on dye decolorization are demonstrated in detail. The optimum pH for both Fenton and Fenton-like reactions in this study are about pH 2.5-3.0. Increasing the dose of ferric nitrate enhances the dye decolorization. The optimal levels of H2O2 required for the process are also examined. High levels of H2O2 appear to reduce dye decolorization. In addition, it is also found that decolorization of azo dyes undergoes a faster reaction rate than mineralization of azo dyes.

Original languageEnglish
Pages (from-to)1409-1414
Number of pages6
JournalChemosphere
Volume58
Issue number10
DOIs
Publication statusPublished - 2005 Mar

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Environmental Chemistry
  • General Chemistry
  • Pollution
  • Health, Toxicology and Mutagenesis

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