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 |
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Format: | Artikel |
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. |
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ISSN: | 1878-5190 1878-5204 |
DOI: | 10.1007/s11144-023-02515-8 |