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Fe(III)-exchanged zeolites as efficient electrocatalysts for Fenton-like oxidation of dyes in aqueous phase.
- Source :
- Journal of Environmental Chemical Engineering; Jun2022, Vol. 10 Issue 3, pN.PAG-N.PAG, 1p
- Publication Year :
- 2022
-
Abstract
- 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 (C 32 H 22 N 6 Na 2 O 6 S 2) 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 (NH 4 <superscript>+</superscript>, H<superscript>+</superscript> and Na<superscript>+</superscript>) 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(NH 4)ZSM-5 - exhibited excellent activity and stability at the end of the electrolysis (within 60 min), with a total dye degradation and an higher mineralization on Fe(H)ZSM-5 (64% of TOC), compared with Fe(Na)Y nano , which takes twice as long (120 min) 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 Fe<superscript>3+</superscript> ions within the framework, without the aggregation of iron and the addition of H 2 O 2 , at room temperature. [Display omitted] • Easy preparation of Fenton-like catalysts based on zeolites, MFI and FAU. • Highly effective Fe(III)-zeolite-modified electrodes to electro-Fenton oxidation. • Electrochemical method allows faster mineralization of dye without redox agents at RT. • Eco-friendly Fenton-like oxidation was achieved with MFI-zeolite catalysts. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 22133437
- Volume :
- 10
- Issue :
- 3
- Database :
- Supplemental Index
- Journal :
- Journal of Environmental Chemical Engineering
- Publication Type :
- Academic Journal
- Accession number :
- 157692705
- Full Text :
- https://doi.org/10.1016/j.jece.2022.107891