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https://hdl.handle.net/1822/77975
Título: | Fe(III)-exchanged zeolites as efficient electrocatalysts for Fenton-like oxidation of dyes in aqueous phase |
Autor(es): | Bencheqroun, Zineb Sahin, Nihat E. Soares, Olívia S. G. P. Pereira, Manuel F. R. Zaitan, Hicham Nawdali, Mustapha Rombi, Elisabetta Fonseca, António Parpot, Pier Neves, Isabel C. |
Palavras-chave: | Fe(III)-zeolite-modified electrodes Fenton-like oxidation Dyes/water Room temperature without HO Without H O 2 2 Without H2O2 |
Data: | Jun-2022 |
Editora: | Elsevier BV |
Revista: | Journal of Environmental Chemical Engineering |
Citação: | Bencheqroun, Zineb; Sahin, Nihat E.; Soares, Olívia S. G. P.; Pereira, Manuel F. R.; Zaitan, Hicham; Nawdali, Mustapha; Rombi, Elisabetta; Fonseca, António; Parpot, Pier; Neves, Isabel C., Fe(III)-exchanged zeolites as efficient electrocatalysts for Fenton-like oxidation of dyes in aqueous phase. Journal of Environmental Chemical Engineering, 10(3), 107891, 2022 |
Resumo(s): | Electrochemical oxidation, a powerful tool for the conversion of several of organic dye compounds using metal-exchanged zeolite modified electrodes, has shown great potential due to its capability of high efficiency degradation, a global priority for a sustainable environment. In this study, the role of the Fe(III)-exchanged-zeolite-modified electrodes using two different zeolite structures (such as FAU (Y) and MFI (ZSM-5)) on the Fenton-like oxidation of Congo Red dye (C32H22N6Na2O6S2) was investigated at room temperature. To clarify the electrocatalytic trend observed by constant potential electrolysis, the surface acidity of the catalysts prepared by ion-exchange method was determined by microcalorimetric measurements of ammonia adsorption. The different acid properties deriving from the presence of different cations (NH4+, H+ and Na+) in the case of MFI structure were found to enhance the ion-exchange capacity as well as the oxidation reaction. MFI catalysts - Fe(Na)ZSM-5, Fe(H)ZSM-5 and Fe(NH4)ZSM-5 - exhibited excellent activity and stability at the end of the electrolysis (within 60min), with a total dye degradation and an higher mineralization on Fe(H)ZSM-5 (64% of TOC), compared with Fe(Na)Ynano, which takes twice as long (120min) for total degradation, with 19% of TOC removal. This work provides an effective route for the development of stable Fe(III)-zeolite-modified electrodes for electro-Fenton oxidation, with a better stabilization of Fe3+ ions within the framework, without the aggregation of iron and the addition of H2O2, at room temperature. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/77975 |
DOI: | 10.1016/j.jece.2022.107891 |
ISSN: | 2213-3437 |
Versão da editora: | http://www.journals.elsevier.com/journal-of-environmental-chemical-engineering |
Arbitragem científica: | yes |
Acesso: | Acesso restrito UMinho |
Aparece nas coleções: | CEB - Publicações em Revistas/Séries Internacionais / Publications in International Journals/Series CDQuim - Artigos (Papers) |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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document_55554_1.pdf Acesso restrito! | 2,18 MB | Adobe PDF | Ver/Abrir |