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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Surface composition and catalytic activity of an iron mining residue for simultaneous degradation of sulfonamide antibiotics

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Ayala-Duran, Saidy C. [1, 2] ; Hammer, Peter [1] ; Pupo Nogueira, Raquel F. [1, 2]
Total Authors: 3
[1] Sao Paulo State Univ, Inst Chem, UNESP, Araraquara, BR-14800-060 Sao Paulo - Brazil
[2] Sao Paulo State Univ, Natl Inst Alternt Technol Detect, Toxicol Evaluat, Removal Micropollutants, Radioactives, INCT, DATREM, UNESP, Araraquara, Sao Paulo - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Environmental Science and Pollution Research; v. 27, n. 2, SI, p. 1710-1720, JAN 2020.
Web of Science Citations: 0

Iron mining residue was evaluated as a potential catalyst for heterogeneous Fenton/photo-Fenton degradation of sulfonamide antibiotics. The residue contained 25% Fe2O3 and 8% CeO2, as determined by X-ray fluorescence spectroscopy, as well as other minor phases such as P2O5, SiO2, and TiO2. X-ray photoelectron spectroscopy analysis revealed a lower content of iron oxides on the surface, which restricted interaction of the residue with H2O2. Despite this limitation and the relatively low specific surface area (26 m(2) g(-1)) of the crude iron mining residue (without any pretreatment), the material presented high catalytic activity for Fenton degradation of sulfonamide antibiotics. The degradation was strongly dependent on the initial pH, showing the highest efficiency at pH 2.5. For this condition, a concentration of sulfathiazole below the detection limit was obtained within 30 min, under black light irradiation and using 0.3 g L-1 residue, with low H2O2 consumption (0.2 mmol L-1). The residue also provided highly efficient sulfathiazole degradation in the dark, with the concentration of the antibiotic decreasing to an undetectable level after 45 min. Simultaneous degradation of two sulfonamide antibiotics revealed higher recalcitrance of sulfamethazine, compared to sulfathiazole, but the levels of both antibiotics decreased to below the detection limit after 45 min. The residue was very stable, since no significant concentration of soluble iron was detected after the degradation process. Furthermore, high catalytic activity was maintained during up to five cycles, showing the potential of this material for use as a low-cost and environmentally compliant catalyst in Fenton processes. (AU)

FAPESP's process: 15/21732-5 - Degradation of organic contaminants by heterogeneous fenton process mediated by modified magnetites and iron mining residues
Grantee:Raquel Fernandes Pupo Nogueira
Support type: Regular Research Grants