Mechanism and stability of an Fe-based 2D MOF during the photoelectro-Fenton treatment of organic micropollutants under UVA and visible light irradiation.

Autor: Ye Z; Laboratori d'Electroquímica dels Materials i del Medi Ambient, Departament de Química Física, Facultat de Química, Universitat de Barcelona, Martí i Franquès 1-11, 08028, Barcelona, Spain; Barrer Centre, Department of Chemical Engineering, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK., Schukraft GEM; Barrer Centre, Department of Chemical Engineering, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK., L'Hermitte A; Barrer Centre, Department of Chemical Engineering, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK., Xiong Y; Barrer Centre, Department of Chemical Engineering, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK., Brillas E; Laboratori d'Electroquímica dels Materials i del Medi Ambient, Departament de Química Física, Facultat de Química, Universitat de Barcelona, Martí i Franquès 1-11, 08028, Barcelona, Spain., Petit C; Barrer Centre, Department of Chemical Engineering, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK. Electronic address: camille.petit@imperial.ac.uk., Sirés I; Laboratori d'Electroquímica dels Materials i del Medi Ambient, Departament de Química Física, Facultat de Química, Universitat de Barcelona, Martí i Franquès 1-11, 08028, Barcelona, Spain. Electronic address: i.sires@ub.edu.
Jazyk: angličtina
Zdroj: Water research [Water Res] 2020 Oct 01; Vol. 184, pp. 115986. Date of Electronic Publication: 2020 Jul 10.
DOI: 10.1016/j.watres.2020.115986
Abstrakt: This work reports the novel application of an Fe-based 2D metal-organic framework (MOF), prepared with 2,2'-bipyridine-5,5'-dicarboxylate (bpydc) as organic linker, as highly active catalyst for heterogeneous photoelectro-Fenton (PEF) treatment of the lipid regulator bezafibrate in a model matrix and urban wastewater. Well-dispersed 2D structures were successfully synthesized and their morphological, physicochemical and photocatalytic properties were assessed. UV/Vis PEF using an IrO 2 /air-diffusion cell with an extremely low catalyst concentration (0.05 g L -1 , tenfold lower than reported 3D MOFs) outperformed electro-oxidation with electrogenerated H 2 O 2 , electro-Fenton and visible-light PEF. Its excellent performance was explained by: (i) the enhanced mass transport of H 2 O 2 (and organic molecules) at the 2D structure, providing active sites for heterogeneous Fenton's reaction and in-situ Fe(II) regeneration; (ii) the ability of photoinduced electrons to reduce H 2 O 2 to • OH, and Fe(III) to Fe(II); and (iii) the enhanced charge transfer and excitation of Fe-O clusters, which increased the number of electron-hole pairs. LC-QToF-MS and GC-MS allowed the identification of 16 aromatic products of bezafibrate. The complete removal of four micropollutants mixed in urban wastewater at pH 7.4 revealed the great potential of (Fe-bpydc)-catalyzed PEF process.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2020 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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