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<p>Cobalt phosphate Co<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub> (CoPO) was synthesized by wet chemical method in the presence of oxalate for its application as a heterogeneous Fenton-like catalyst to remove Basic Yellow 28 (BY-28) dye from water. The formation of the CoPO phase was confirmed by XRD analysis, revealing a crystallite size of 27&#xa0; nm. The optimal synthesis temperature was found to be 800 °C based on thermal analysis. The modified synthesis method allows for obtaining a homogeneous distribution of spherical grains with surface area of 3.78 m<sup>2</sup> g<sup>−1</sup>. The catalytic activity is attributed to hydroxyl radicals (HO·) generated through the activation of hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>). The degradation rate decreased to 10% after 300&#xa0;min in the presence of 500&#xa0;mM tert-butyl alcohol (TBA), a well-known HO· scavenger. Several reaction parameters influencing the Fenton-like process were investigated and the highest BY-28 degradation yield was achieved under neutral pH with a CoPO dose of 1.25&#xa0;g/L and H<sub>2</sub>O<sub>2</sub> concentration of 50&#xa0;mM. The catalyst was successfully reused five times, maintaining a removal efficiency of 80% after 60&#xa0;min with a good crystallinity revealed by XRD analysis. Moreover, other organic dyes commonly found in the textile wastewater were also degraded. The kinetic study revealed that the degradation reaction of BY-28 follows the Behnajady-Modirshahla-Ghanbery (BMG) model, while the thermodynamic analysis indicated that the process is non-spontaneous and endothermic. This study offers valuable insights into the performance, kinetics, and thermodynamics of cobalt phosphate-based Fenton-like catalysts for the degradation of organic dyes, highlighting their potential as effective candidates for such applications.</p>

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Performance, Kinetic and Thermodynamic Study of Cobalt (II) Phosphate as a Promising Catalyst for Organic Dyes Removal

  • 期刊论文

  • 发表日期：

    2025年7月12日

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  • Djaafar Meziani,
  • Yasmina Roumila,
  • Nesrine Khesrani,
  • Djamila Ould Larbi,
  • Faouzi Saib,
  • Mohamed Trari

摘要

Cobalt phosphate Co3(PO4)2 (CoPO) was synthesized by wet chemical method in the presence of oxalate for its application as a heterogeneous Fenton-like catalyst to remove Basic Yellow 28 (BY-28) dye from water. The formation of the CoPO phase was confirmed by XRD analysis, revealing a crystallite size of 27  nm. The optimal synthesis temperature was found to be 800 °C based on thermal analysis. The modified synthesis method allows for obtaining a homogeneous distribution of spherical grains with surface area of 3.78 m2 g−1. The catalytic activity is attributed to hydroxyl radicals (HO·) generated through the activation of hydrogen peroxide (H2O2). The degradation rate decreased to 10% after 300 min in the presence of 500 mM tert-butyl alcohol (TBA), a well-known HO· scavenger. Several reaction parameters influencing the Fenton-like process were investigated and the highest BY-28 degradation yield was achieved under neutral pH with a CoPO dose of 1.25 g/L and H2O2 concentration of 50 mM. The catalyst was successfully reused five times, maintaining a removal efficiency of 80% after 60 min with a good crystallinity revealed by XRD analysis. Moreover, other organic dyes commonly found in the textile wastewater were also degraded. The kinetic study revealed that the degradation reaction of BY-28 follows the Behnajady-Modirshahla-Ghanbery (BMG) model, while the thermodynamic analysis indicated that the process is non-spontaneous and endothermic. This study offers valuable insights into the performance, kinetics, and thermodynamics of cobalt phosphate-based Fenton-like catalysts for the degradation of organic dyes, highlighting their potential as effective candidates for such applications.