Magnetic TiO2/Fe3O4-Chitosan Beads: A Highly Efficient and Reusable Catalyst for Photo-Electro-Fenton Process

Heterogeneous photo-electro-Fenton process is an attractive technology for the removal of recalcitrant pollutants. To better exploit the presence of an irradiation source, a bifunctional catalyst with TiO2 nanoparticles embedded into an iron–chitosan matrix was developed. The catalytic activity of t...

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Bibliographic Details
Published in:Catalysts 2022-11, Vol.12 (11), p.1425
Main Authors: Rezgui, Soumaya, Díez, Aida M., Monser, Lotfi, Adhoum, Nafaa, Pazos, Marta, Sanromán, M. Ángeles
Format: Article
Language:English
Subjects:
Agricultural production
Beads
bifunctional catalyst
Carboxylic acids
Catalysts
Catalytic activity
Chemical reactions
Chitosan
chlordimeform
Composite materials
Decomposition
Efficiency
Iron oxides
Mineralization
Nanoparticles
Optimization
Oxidation
Pesticides
photo-electro-Fenton process
Photocatalysis
Pollutants
Reduction
Stability analysis
Titanium dioxide
wastewater treatment
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Summary:Heterogeneous photo-electro-Fenton process is an attractive technology for the removal of recalcitrant pollutants. To better exploit the presence of an irradiation source, a bifunctional catalyst with TiO2 nanoparticles embedded into an iron–chitosan matrix was developed. The catalytic activity of the catalyst was improved by the optimization of the loaded TiO2 content. The prepared composite catalysts based on TiO2, Fe3O4 and chitosan were called TiO2/Fe3O4-CS beads. The best catalyst with an optimal ratio TiO2/Fe = 2 exhibited a high efficiency in the degradation and mineralization of chlordimeform (CDM) insecticide. Under the optimum conditions (concentration of catalyst equal to 1 g L−1 and applied current intensity equal to 70 mA), a real effluent doped with 30 mg L−1 of CDM was efficiently treated, leading to 80.8 ± 1.9% TOC reduction after 6 h of treatment, with total removal of CDM after only 1 h.The generated carboxylic acids and minerals were identified and quantified. Furthermore, the stability and reusability of the developed catalyst was examined, and an insignificant reduction in catalytic activity was noticed for four consecutive cycles of the photo-electro-Fenton process. Analyses using SEM, XRD and VSM showed a good stability of the physicochemical properties of the catalyst after use.
ISSN:2073-4344
2073-4344
DOI:10.3390/catal12111425