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Removal of Azo Dye Acid Red 27 from Aqueous Solutions Using Classical and Modified Fenton Reagent with Zero-Valent Iron

Research and development


  • Kliś Simona
    Graduate of Silesian Environmental Doctoral Studies of the Central Mining Institute, Katowice, Poland
  • Thomas Maciej
    Chemiqua Company, Kraków, Poland
  • Barbusiński Krzysztof
    Institute of Water and Wastewater Engineering, Silesian University of Technology, Gliwice, Poland
  • Gołombek Klaudiusz
    Institute of Engineering Materials and Biomaterials, Silesian University of Technology, Gliwice, Poland
  • Krzemiński Łukasz (j/w)
  • Chyc Marek
    Institute of Mathematical and Natural Science, State Higher Vocational School in Tarnów, Tarnów, Poland

Nr DOI: 10.5604/01.3001.0013.2908

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The article compares the classic Fenton reagent (Fe2+/H2O2) with its modification with zero-valent iron (ZVI/H2O2) to remove azo dye Acid Red 27 from aqueous solutions at a concentration of 100 mg/L. For both methods, the most favorable parameter values ​​were determined at which  visual discoloration of the solutions tested was obtained (for Fe2+/H2O2:pH 3.5, H2O2=60 mg/L, Fe2+/H2O2=0.3, t=15 min, and for ZVI/H2O2: pH 3, H2O2=40 mg/L, ZVI=80 mg/L, t=15 min). Under these conditions, the COD value was reduced by 71.5% and 69.2% for the classic Fenton and its modification, respectively. A reduction in toxicity was also obtained for Vibrio fischeri bacteria to below 25% by using the Microtox test.  ZVI digestion at acidic pH for 10 minutes allowed to shorten the reaction time by about four times - from 15 to 4 minutes. BET analysis showed that the specific surface area increases with the digestion time, which significantly accelerates the reaction. The visual discoloration of aqueous solutions was obtained, and the final COD values ​​were very small, ranging from 49-53 mg O2/L. According to the Aliivibrio fischeri toxicity classification test for water samples, all solutions of dyes tested can be considered as non-toxic (toxicity value <25%). In the study presented, results of decreasing the COD value and concentration of the dye in the ZVI/H2O2 method obtained are slightly worse compared to the Fe2+/H2O2 method. However, taking the decolorisation time as a criterion, a four times faster decolorisation time was obtained in the ZVI/H2O2 method, compared to the Fe2+/H2O2 method.


Acid Red 27, Fenton reagent, modified Fenton reagent, zero-valent Iron, wastewater treatment.


Kliś S, Thomas M, Barbusiński K, Gołombek K, Krzemiński Ł, Chyc M. Removal of Azo Dye Acid Red 27 from Aqueous Solutions Using Classical and Modified Fenton Reagent with Zero-Valent Iron. FIBRES & TEXTILES in Eastern Europe 2019; 27, 5(137): 100-106. DOI: 10.5604/01.3001.0013.2908

Published in issue no 5 (137) / 2019, pages 100–106.


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