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<p>In this investigation, the degradation of Ponceau 4R (P4R) using an iron-modified dolomite (Fe-RD) was studied by heterogeneous Fenton oxidation. The incorporation of the iron led to a significant increase in the iron content, reaching a 5.3 wt%. The degradation efficiency was significantly affected by catalyst dosage, H<sub>2</sub>O<sub>2</sub> concentration, temperature and initial dye concentration. The reaction kinetics was well described by the first-order model. The thermodynamic study revealed the endothermic nature of the process (∆H° = 56.84&#xa0;kJ/mol).The calculated activation energy (E<sub>a</sub> = 59.48&#xa0;kJ/mol) revealed that the reaction rate was controlled by the surface reaction. A design of experiment (DoE) approach was adapted to find out the most adequate mathematical modelIn a first step, a full factorial design (FFD) followed by a central composite design (CCD). The total decolorization was achieved at the optimal reaction conditions (C<sub>0</sub> = 46.4&#xa0;mg/L, m 1.20&#xa0;g/L, [H<sub>2</sub>O<sub>2</sub>] = 4.50&#xa0;mM). After 5 consecutive cycles the catalyst preserved its activity (DE = 80% and COD = 7.5&#xa0;mg O<sub>2</sub>/L). The iron leaching during the fifth cycle was less than 0.5&#xa0;mg/L.</p>

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Mathematical Modeling using Full Factorial and Central Composite Design Approach for Heterogeneous Fenton Oxidation of Ponceau 4R Azo Dye

  • 期刊论文

  • 发表日期：

    2025年11月12日

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  • Asma Bellaouar,
  • Ali Boukhemkhem,
  • Samir Hameurlaine,
  • Nacira Bellaouar,
  • Carmen B. Molina

摘要

In this investigation, the degradation of Ponceau 4R (P4R) using an iron-modified dolomite (Fe-RD) was studied by heterogeneous Fenton oxidation. The incorporation of the iron led to a significant increase in the iron content, reaching a 5.3 wt%. The degradation efficiency was significantly affected by catalyst dosage, H2O2 concentration, temperature and initial dye concentration. The reaction kinetics was well described by the first-order model. The thermodynamic study revealed the endothermic nature of the process (∆H° = 56.84 kJ/mol).The calculated activation energy (Ea = 59.48 kJ/mol) revealed that the reaction rate was controlled by the surface reaction. A design of experiment (DoE) approach was adapted to find out the most adequate mathematical modelIn a first step, a full factorial design (FFD) followed by a central composite design (CCD). The total decolorization was achieved at the optimal reaction conditions (C0 = 46.4 mg/L, m 1.20 g/L, [H2O2] = 4.50 mM). After 5 consecutive cycles the catalyst preserved its activity (DE = 80% and COD = 7.5 mg O2/L). The iron leaching during the fifth cycle was less than 0.5 mg/L.