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

C. L. Hsueh, Yao-Hui Huang, C. C. Wang, Chuh-Yung Chen

Research output: Contribution to journalArticle

300 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 1

Fingerprint

Azo Compounds
Azo dyes
dye
Coloring Agents
Iron
Dyes
iron
Degradation
degradation
Remazol black B
Waste Water
Effluents
Wastewater
Color
Sewage sludge
Sewage
Taiwan
Reaction rates
Nitrates
effluent

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Environmental Chemistry
  • Chemistry(all)
  • Pollution
  • Health, Toxicology and Mutagenesis

Cite this

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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.",
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Degradation of azo dyes using low iron concentration of Fenton and Fenton-like system. / Hsueh, C. L.; Huang, Yao-Hui; Wang, C. C.; Chen, Chuh-Yung.

In: Chemosphere, Vol. 58, No. 10, 01.03.2005, p. 1409-1414.

Research output: Contribution to journalArticle

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