Abstract
In this wok, a new CuO-TiO2-clay composite was synthesized by the sol–gel method and explored as a photocatalyst for wastewater remediation. The synthesized material was characterized by X-ray diffraction (XRD), Raman spectroscopy (RS), diffuse reflectance spectroscopy (DRS), scanning electron microscopy (SEM), X-ray fluorescence (XRF), and Fourier Transformer InfraRed (FTIR). The photocatalytic activity of the composite was tested on tartrazine dye (TARTZ) removal. Particular emphasis was focused on the effect of the key operating parameters such as photocatalyst dose, pH, light intensity, and initial concentration of dye. The optimization of three simultaneous parameters, namely methylene blue concentration (MB; pollutant in competition with TARTZ), NaCl concentration, and irradiation time, was examined via the response surface methodology (RSM). The CuO-TiO2-clay composite showed the best photocatalytic performance with 62.50% of photodegradation yield of TARTZ in visible light irradiation compared to 19.38% and 43.78% for pure TiO2 and TiO2-clay, respectively. This performance reached to 100% in sunlight source during the same time. The optimal conditions provided by the response surface methodology (RSM) were 180 min for irradiation time and 3.6 mg/L for MB concentration. After 120 min, 11.35% of TARTZ mineralization was obtained. The scavenger study revealed the involvement of OH· and h+ species, but especially \({{\text{O}}}_{2}^{-.}\) as the main responsible for the photodegradation of the TARTZ. The current study highlights the potential of CuO-TiO2-clay composite as efficient photocatalytic systems for degrading hazardous organic pollutants in water.
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References
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Acknowledgements
The authors would like to thank Ivane LELIEVRE (UniLaSalle Rennes) for their technical help. The authors would also like to acknowledge the Erasmus+ International Credit Mobility for the Grant (Grant agreement number: 2019-1-FR01-KA107-060920) between the UniLaSalle Polytechnic Institute and the University of Maroua. This work was supported by the International Research Center “Innovation Transportation and Production Systems” of the I-SITE CAP 20-25.
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Highlights
• A new CuO-TiO2-Clay composite was successfully synthesized by the sol-gel method and characterized.
• The synthesized CuO-TiO2-Clay composite shows higher photocatalytic activity under visible and solar light.
• The response surface methodology (RSM) provides the optimal conditions for TARTZ photodegradation.
• The reactive species such as HO•, h + , but especially O2-• free radicals were responsible for the TARTZ dye photodegradation.
• The reuse of CuO-TiO2-Clay showed a decrease in photocatalyst activity after three tests (a loss of degradation efficiency of around 14%).
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Talami, B., Zeghioud, H., Dalhatou, S. et al. A New Sunlight Active Photocatalyst Based on CuO-TiO2-Clay Composite for Wastewater Remediation: Mechanistic Insights and Degradation Optimization. Water Air Soil Pollut 235, 104 (2024). https://doi.org/10.1007/s11270-024-06884-1
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DOI: https://doi.org/10.1007/s11270-024-06884-1