Photocatalytic degradation of metsulfuron methyl in an herbicidal formulation by TiO2 supported on magnetite particles coated with SiO2-TiO2 oxides

Authors

  • Juan Paulo Montañez INIQUI-CONICET-UNSA
  • Carla Lorena Heredia
  • Edgardo Ling Sham
  • Elsa Mónica Farfán Torres

DOI:

https://doi.org/10.52292/j.laar.2025.3442

Keywords:

remediation, supported catalysts, magnetite, Metsulfuron methyl, photodegradation

Abstract

Aqueous pesticides may be degraded through heterogeneous photocatalysis with TiO2. Supporting it on different materials, for example, magnetic particles, its further removal is facilitated. In this work, we report the synthesis of TiO2 supported on TiO2-SiO2-coated magnetite particles by a sol-gel process. These supporting materials were synthesized by varying the Si/Ti ratio, thus composites with different structural characteristics were obtained. With a theoretical Si/Ti molar ratio equal to 10, a supporting material with the highest specific surface area was synthesized (FTS-10). By supporting TiO2 over FTS-10, CM-2 catalyst was obtained. This catalyst degraded 70 % of the herbicide Metsulfuron methyl present in a commercial formulation at persistent conditions, with similar activity to that of the bulk TiO2. CM-2 can be separated by magnetic attraction, and it can be reused for at least five cycles. We propose this catalyst as a good alternative for the remediation of contaminated effluents with this herbicide.

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Published

2025-07-15

Issue

Vol. 55 No. 3 (2025): Latin American Applied Research

Section

Applied Chemistry

License

Copyright (c) 2025 Latin American Applied Research - An international journal

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