Journal
CHEMICAL ENGINEERING RESEARCH & DESIGN
Volume 171, Issue -, Pages 198-212Publisher
ELSEVIER
DOI: 10.1016/j.cherd.2021.05.008
Keywords
Photocatalysis; Mesoporous ZnO; Cerium; Statistical modeling; CCD-RSM
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Funding
- Algerian DGRST-MESRS
- University of Tlemcen
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This study focuses on optimizing the photodegradation of methyl orange (MO) using a central composite design (CCD) coupled with Response Surface Methodology (RSM). The results show that cerium nanoparticles (CeNPs) enhance the photocatalytic performance of ZnO at 2% Ce content. The optimum conditions were found to be pH of solution at 5.58, MO concentration at 20.72 mg L-1, and catalyst dosage at 0.63 g L-1.
This paper investigates a new modeling approach of central composite design (CCD) in Response Surface methodology (RSM) for the optimization of methyl orange (MO) photodegradation based to the prepared materials under UV-vis irradiation. Mesoporous zinc oxide (ZnO) have been synthesized at different cerium (Ce) contents (2, 5 and 7 wt%) through a single step sol gel method. Subsequently, cerium nanoparticles (CeNPs) have been impregnated on mesoporous ZnO. The physico-chemical characteristics of each catalyst are described through several approaches. The photocatalytic activity of the prepared catalysts shows that CeNPs enhance the photocatalytic performance of ZnO at 2 wt% Ce content. MO photodergadation processes of the optimal catalyst can be mathematically described as a function of pH-solution, catalyst dosage and MO concentration being modeled by a CCD-RSM. Based on a statistical modeling (quadratic regression) and an optimization process (ANOVA analysis), the optimum conditions were achieved for pH of solution of 5.58, MO concentration of 20.72 mg L-1 and catalyst dosage of 0.63 g L-1 which allowed reaching 100% of photodegradation. Overall, the value of the adjusted coefficient of determination (R-2 = 0.9901) indicates that the considered model was quite suitable and that the selected CCD-RSM was successful in optimizing the photodegradation conditions of MO. (C) 2021 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
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