Nontronite mineral clay NAu-2 as support for hematite applied as catalyst for heterogeneous photo-Fenton processes.

Autor: Rojas-Mantilla HD; São Paulo State University (UNESP), Institute of Chemistry, Av. Prof. Francisco Degni 55, 14800-060, Araraquara, SP, Brazil. Electronic address: auriga-kapela@hotmail.com., Ayala-Duran SC; São Paulo State University (UNESP), Institute of Chemistry, Av. Prof. Francisco Degni 55, 14800-060, Araraquara, SP, Brazil. Electronic address: saidycristin@hotmail.com., Pupo Nogueira RF; São Paulo State University (UNESP), Institute of Chemistry, Av. Prof. Francisco Degni 55, 14800-060, Araraquara, SP, Brazil. Electronic address: raquel.pupo@unesp.br.
Jazyk: angličtina
Zdroj: Chemosphere [Chemosphere] 2021 Aug; Vol. 277, pp. 130258. Date of Electronic Publication: 2021 Mar 16.
DOI: 10.1016/j.chemosphere.2021.130258
Abstrakt: This study describes the characterization of Nontronite, a clay mineral with high content of structural iron, before and after iron incorporation and 600 °C heat treatment. The Nontronite was classified as a mesoporous material, with high absorption in the UV-Vis range and band gap energy of 1.9 eV, indicative of the presence of superficial hematite, also verified in XRD analysis. The heat treatment promoted a structure rearrangement and the conversion of other iron phases to hematite, allowing the formation of surface irregular sites on Nontronite and facilitating the access for the decomposition of H 2 O 2 into HO. Its catalytic activity in heterogeneous photo-Fenton process was evaluated during the degradation of the antibiotic sulfathiazole (STZ) and showed high activity achieving undetectable levels of STZ after 20 min under UV-LED irradiation and solar irradiation, and showing no iron leaching under controlled pH = 3. The degradation intermediates identified indicated hydroxylation as the main degradation route.
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Databáze: MEDLINE
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