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<p>In the present study, Co-TiO<sub>2</sub>/Natural hematite catalyst was synthesized using a impregnation method. Several techniques were used to characterize the prepared composite such as: XRD, FTIR, SEM-EDX and BET. The pollutant chosen to evaluate the catalytic performance was Congo red (CR). The experimental variables examined in this work include mass of the catalyst (0.1–0.5&#xa0;g), CR dye concentration (30–70&#xa0;mg/L) and the pH of the solution (2–4). A Response Surface Methodology (RSM), specifically Box-Behnken design, was employed to optimize the parameters of the photocatalytic process. Based on the obtained statistical data, the best conditions for the removal of CR (96.84%) were: catalyst mass of 0.3&#xa0;g, CR concentration of 50&#xa0;mg/L, and pH 3. Overall, the used model was very appropriate, as shown by the value of the corrected coefficient of determination (R<sup>2</sup>) of 0.998. Reuse tests have shown that the prepared catalyst exhibits satisfactory stability.</p>

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Box-Behnken Design Optimization of Photocatalytic Parameters for Congo Red Degradation Using Co-TiO2/Hematite Catalyst

  • 期刊论文

  • 发表日期：

    2026年3月27日

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  • Sourour Salhi,
  • Wiem Hamza,
  • Abdessalem Omri,
  • Ridha Ben Salem

摘要

In the present study, Co-TiO2/Natural hematite catalyst was synthesized using a impregnation method. Several techniques were used to characterize the prepared composite such as: XRD, FTIR, SEM-EDX and BET. The pollutant chosen to evaluate the catalytic performance was Congo red (CR). The experimental variables examined in this work include mass of the catalyst (0.1–0.5 g), CR dye concentration (30–70 mg/L) and the pH of the solution (2–4). A Response Surface Methodology (RSM), specifically Box-Behnken design, was employed to optimize the parameters of the photocatalytic process. Based on the obtained statistical data, the best conditions for the removal of CR (96.84%) were: catalyst mass of 0.3 g, CR concentration of 50 mg/L, and pH 3. Overall, the used model was very appropriate, as shown by the value of the corrected coefficient of determination (R2) of 0.998. Reuse tests have shown that the prepared catalyst exhibits satisfactory stability.