Photo-Fenton oxidation of Orange G azo dye: process optimization and mineralization mechanism

  • Jean-Baptiste Tarkwa
  • Nihal Oturan
  • Elie Acayanka
  • Samuel Laminsi
  • Mehmet A. OturanEmail author
Original Paper


Textile effluents containing synthetic dyes are one of the most important sources of water pollution. Several dyes are toxic to the aquatic life and indirectly to humans, and therefore should be treated before rejection to natural water streams. As conventional wastewater treatment systems remain inefficient for treatment of these recalcitrant pollutants, the use of advanced oxidation processed is required. The degradation of the Orange G dye was studied using the photo-Fenton process. Results showed that the use of experimental kinetics rate constants to optimize the ratio R = [H2O2]/[Fe3+] constitutes a suitable way to minimize the occurrence of side reactions. An optimal molar ratio R of 13.8 was found allowing complete degradation of Orange G in 4 min and 93.41% total organic carbon (TOC) removal in 180 min. Based on detected intermediates and end-products, a plausible degradation mechanism of Orange G dye is proposed. Therefore, we demonstrated that the photo-Fenton process can be applied efficiently to the removal of toxic/persistent organic pollutants such as synthetic dyes from water.


Photo-Fenton Orange G Mineralization By-products Degradation mechanism 



The authors are grateful to the “Service de la Cooperation et d’Action Culturelle” (SCAC) at the French Embassy in Cameroon for financial support.


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Copyright information

© Springer Nature Switzerland AG 2018

Authors and Affiliations

  • Jean-Baptiste Tarkwa
    • 1
    • 2
  • Nihal Oturan
    • 1
  • Elie Acayanka
    • 2
  • Samuel Laminsi
    • 2
  • Mehmet A. Oturan
    • 1
    Email author
  1. 1.Laboratoire Géomatériaux et Environnement, EA 4508Marne-la-Vallée Cedex 2France
  2. 2.Laboratoire de Chimie Physique et Analytique Appliquée, Département de Chimie InorganiqueUniversité de Yaoundé IYaoundéCameroun

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