Fenton-like degradation of sulfathiazole using copper-modified MgFe-CO3 layered double hydroxide

The catalytic activity of layered double hydroxides, with and without insertion of copper, was evaluated in a heterogeneous Fenton process for degradation of the antibiotic sulfathiazole (STZ). The characterizations with different techniques revealed lamellar structures formed by stacking of layers...

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Bibliographic Details
Published in:Journal of hazardous materials 2021-07, Vol.413, p.125388-125388, Article 125388
Main Authors: de Melo Costa-Serge, Nayara, Gonçalves, Rosembergue Gabriel Lima, Rojas-Mantilla, Hernán Dario, Santilli, Celso Valentim, Hammer, Peter, Nogueira, Raquel Fernandes Pupo
Format: Article
Language:English
Subjects:
Copper Fenton
Hydroperoxyl/superoxide radical
Hydroxyl radical
Pyroaurite
Vis-LED
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Summary:The catalytic activity of layered double hydroxides, with and without insertion of copper, was evaluated in a heterogeneous Fenton process for degradation of the antibiotic sulfathiazole (STZ). The characterizations with different techniques revealed lamellar structures formed by stacking of layers containing magnesium, iron, and copper cations. The insertion of copper in the lamellar structure increased the specific area of the material and the degradation kinetics, achieving complete STZ removal after 90 min. X-ray photoelectron spectroscopy analysis showed the presence of Cu(II) and Cu(I) surface sites, which contributed to the generation of hydroxyl and hydroperoxyl/superoxide radicals. It also indicated an increase of Cu(I) content after use. For both materials, but specially for LDH without copper, addition of tert-butyl alcohol and p-benzoquinone hindered STZ degradation, indicating the importance of hydroxyl and hydroperoxyl/superoxide radicals in the degradation process, respectively. These results demonstrated the potential of copper-modified MgFe-CO3 as a catalyst for the degradation of emerging contaminants, offering the benefits of easy preparation and high efficiency in the Fenton process. [Display omitted] •CuMgFe-CO3 and MgFe-CO3 layered double hydroxides (LDH) showed phase purity and stability.•Presence of surface Cu(I) was demonstrated, which increased after degradation reaction.•Copper-LDH showed improved catalytic activity at pH 7.5 even after four cycles use.•The role of HO• and HO2•/O2•- radicals on sulfathiazole degradation with both LDH was demonstrated.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2021.125388