Degradation of agricultural pollutants by biopolymer-enhanced photocatalysis: application of Taguchi method for optimization

This paper evaluates the photocatalytic degradation of malathion using titanium dioxide (TiO 2 ) nanoparticles supported on sodium alginate (SA), polyvinyl alcohol (PVA), polyvinyl pyrrolidone (PVP) polymer beads and ultraviolet light as irradiation source with a wavelength of 254 nm. Six different...

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Veröffentlicht in:Reaction kinetics, mechanisms and catalysis mechanisms and catalysis, 2024-02, Vol.137 (1), p.523-545
Hauptverfasser: Estrada-Vázquez, Rogelio, Vaca-Mier, Mabel, Bustos-Terrones, Victoria, Rangel-Peraza, Jesús Gabriel, Loaiza, Juan G., Hermosillo-Nevárez, Jhonatan J., Bustos-Terrones, Yaneth A.
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Sprache:eng
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Zusammenfassung:This paper evaluates the photocatalytic degradation of malathion using titanium dioxide (TiO 2 ) nanoparticles supported on sodium alginate (SA), polyvinyl alcohol (PVA), polyvinyl pyrrolidone (PVP) polymer beads and ultraviolet light as irradiation source with a wavelength of 254 nm. Six different types of beads were prepared: SA, PVA, PVP, SA/TiO 2 , PVA/TiO 2 , and PVP/TiO 2 to assess the effect of the adsorbent material on the photodegradation process by optimizing an experimental design using the Taguchi method. Four factors were considered: TiO 2 concentration, bead mass, polymer type, and initial malathion concentration. The response variables were the percentage of removal of the contaminant and the removal rate calculated from the first-order kinetic models. A malathion degradation of 99% was achieved after 180 min of operation when using 100 g and 200 g of SA/TiO 2 , PVA/TiO 2 , and PVP/TiO 2 beads. The best operating conditions were 1 g L −1 of TiO 2 , 100 g of bead mass, SA polymer, and 5 mg L −1 of malathion initial concentration. This study found that the adsorption process affected negatively the photodegradation process, reducing the removal efficiency and rate. Finally, the feasibility of the use of a biopolymer-enhanced photocatalytic treatment to degrade agro-industrial contaminants was demonstrated.
ISSN:1878-5190
1878-5204
DOI:10.1007/s11144-023-02515-8