Document Type : Original Articles


Department of Environmental Health Engineering, School of Health, Shiraz University of Medical Sciences, Shiraz, Iran


AbstractBackground: Dyes are visible materials and are considered as one of the hazardous components that make up the industrial waste. Dye compounds in natural water, even in very low concentrations, will lead to environmental problems. Azo dyes are compounds with one or more –N=N– groups and are used in textile industry. Because of its low price, solubility, and stability, azo dyes are widely used in the textile industry. Direct Red 81 (DR81) is one of the azo dyes, which is removed from bodies of water, using various methods. This study aimed to assess DR81 dye removal by Fenton oxidation and the effects of various parameters on this process.Methods: Decolorization tests by Fenton oxidation were performed at dye concentrations of 50, 500, 100 and 1000 mg/L; hydrogen peroxide concentrations of 0, 10, 30, 60 and 120 mg/L; iron (II) sulfate heptahydrate concentrations of 0, 3, 5, 20 and 50 mg/L; and pH levels of 3, 5, 7 and 10 for durations of 5, 10, 20, 30, 60 and 180 minutes.Results: The optimal condition occurred at a dye concentration of 20 mg/L, hydrogen peroxide concentration of 120 mg/L, bivalent iron concentration of 100 mg/L, pH of 3, and duration of 30 minutes. Under such conditions, the maximum dye removal rate was 88.98%.Conclusion: The results showed that DR81 could be decomposed and removed by Fenton oxidation. In addition, the removal of Direct Red 81 (DR81) depends on several factors such as dye concentration, reaction time, concentrations of hydrogen peroxide and iron, and pH.


  1. References
  2. Heravi MM, Kodabande A, Bozorgmehr MR, Ardalan T, Ardalan P. Kinetic and hermodynamic Studies on Biosorption of Direct DR81 from Aqueous Solutions by Chamomilla Plant. Journal of Chemical Health Risks 2012; 2(4): 37-44.
  3. Baban A, Yediler A, Avaz G, Hostede SS. Biological and oxidative treatment of cotton textile dye-bath effluents by fixed and fluidized bed reactors. Bioresour Technol 2010; 101(4): 1147-52.
  4. Naeem A, Hameedb A, Ahmed S. Physicochemical characterization and Bioremediation perspective of textile effluent, dyes and metals by indigenous Bacteria. J Hazard Mater 2009; 164(1): 322-8.
  5. Deepa K, Chandran P, Sudheer Khan S. Bio removal of Direct Red from aqueous solution by Pseudomonas putida and its adsorption isotherms and kinetics. Ecological Engineering 2013; 58: 207-13. http://dx.doi. org/10.1016/j.ecoleng.2013.06.037.
  6. Saidi AR. chlorine dioxide gas efficiency for wastewater color of the textile industry. 9 School of Public Health, Tehran University (1380).
  7. Sanroman M, Pazos A, Ricart M, Cameselle C. Electrochemical decolourisation of structurally different dyes. Chemosphere 2004; 57(3): 233-9.
  8. Keshmirizadeh E, Eshaghi Sh. Removal of Anionic Brown 14 and Cationic Blue 41 dyes via Fenton Process.
  9. Journal of Applied Chemical Research 2015; 9(1): 83-93.
  10. Momen Heravi M, Kodabande A, Bozorgmehr MR, Ardalan T, Ardalan P. Kinetic and Thermodynamic Studies on Biosorption of Direct Red 81 from Aqueous Solutions by Chamomilla Plant. Journal of Chemical Health Risks 2012; 2(4): 37-44.
  11. Nazari Sh, Yari AR, Mahmodian MH, Tanhaye Reshvanloo M, Alizadeh Matboo S, Majidi GH, at el. Application of H2O2 and H2O2 / Fe0 in removal of Acid Red 18 dye from aqueous solutions. Arch Hyg Sci 2013; 2(3): 114-20.
  12. Mahmudi NM, Rayat Tari KH, Borhani Sh, Arami M, Noormohammadian F. decolorization of effluent containing acidic azo dye with Fenton process: Operational factors and comparative study. Journal of Dye Science and Technology 2008; 2: 40-31.
  13. Arbabi M, Ahmadi M, Sedehi M. Optimizing COD and dye removal from yeast wastewater using Fenton oxidation. Journal of Health and Environment, Environmental Health Research Association 2014; 7(3): 384-75.
  14. Sohrabi MR, Khavaran A, Shariati Sh, Shariati Sh. Removal of Carmoisine edible dye by Fenton and photo Fenton processes using Taguchi orthogonal array design. Arabian Journal of Chemistry 2014; 2-9. http:
  15. //
  16. El Haddad M, Regti A, Laamari MR, Mamouni R, Saffaj N. Use of Fenton reagent as advanced oxidative process for removing textile dyes from aqueous solutions. J Mater Environ Sci 2014; 5(3): 667-74.
  17. Hameed BH, Lee TW. Degradation of malachite green in aqueous solution by Fenton process. J Hazard Mater 2009; 164: 468-72.
  18. Emami F, Tehrani Bagha A, Gharanjic K. Investigating factors effecting decolorization of the azo dye CI Reactive Red 120 via Fenton method. Journal of Dye Science and Technology 2010; 114: 104-5.
  19. Chen R, Pignatello JJ. Role of quinone intermediates as electron shuttles in Fenton and photoassisted Fenton oxidations of aromatic compounds. Environ Sci Technol 1997; 31: 2399-406.
  20. Joseph JM, DestaillatsH, Hung HM, Michael R. Hoffmann. The Sonochemical Degradation of Azobenzene and Related Azo Dyes: Rate Enhancements via Fenton’s Reactions. J Phys Chem A 2000; 104: 301-7.
  21. Barbusiński K. The Modified Fenton Process for Dedyeization of Dye Wastewater. Polish Journal of Environmental Studies 2005; 14(3): 281-5.
  22. Chiou CS, Chang CY, Shie JL. Dedyeation of reactive black 5 in aqueous solution by electro-fenton reaction. Environmental Engineering and Management 2006; 16(4): 243-8.
  23. Panizza M, Cerisola G. Electro-Fenton degradation of synthetic dyes. Water Research 2009; 43(2): 339-44.
  24. Mousavi A, Mohammadi P, Parastar M, Qaebzadeh M, Kamari F. Efficiency of Fenton Oxidation in Rodamine B Removal from Synthetic Solutions. Journal of Water and Wastewater 2014; 6: 122-9.
  25. Bahmani P, MalekiA. Ghahremani A, Kohzadi Sh. “Efficiency of fenton oxidation process in removal of remazol black-B from aqueous.” J Health 2013; 4(1): 57-67.
  26. Rahmani Z, Kermani M, Gholami M, Jafari A, Mahmoodi N. Effectiveness of photochemical and
  27. sonochemical processes in degradation of Basic Violet 16 (BV16) dye from aqueous solutions. Iran J Environ Health Sci Eng 2012; 9(1): 14.
  28. Ganesan R, Thanasekaran K. Decolorization of textile dyeing Wastewater by modified solar Photo-Fenton Oxidation. International Journal of Environmental Sciences 2011; 1(6): 1168-76.
  29. Tunc S¸ GürkanaT, Dumanb O. On-line spectrophotometric method for the determination of optimum operation parameters on the dedyeization of Acid Red 66 and Direct Blue 71 from aqueous solution by Fenton process. Chemical Engineering Journal 2012; 182: 431-42.