2024 - Sustainable Industrial Processing Summit
SIPS 2024 Volume 5. Leite Intl. Symp / Iron and Steel
| Editors: | F. Kongoli, P. Assis, R. Alvarenga Vilela, J.A. de Castro, B. Deo, W. Ferreira Santos Jr., GS. Mahobia, T. Usui |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2024 |
| Pages: | 328 pages |
| ISBN: | 978-1-998384-12-9 (CD) |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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PHENOL CATALYTIC OXIDATION OVER IRON AND COOPER-EXCHANGED PILLARED BENTONITE
Khalida Chellal1;1UNIVERSITY OF SCIENCE AND TECHNOLOGY, Algiers, Algeria;
Type of Paper: Regular
Id Paper: 213
Topic: 2
Abstract:
Catalytic Wet Peroxide Oxidation (CWPO) allows the removal of recalcitrant organic compounds under mild conditions when using hydrogen peroxide and a solid catalyst with redox properties to generate •OH from the H2O2 decomposition [1]. Clays modified with the mixed Al/Fe system have shown excellent performance in CWPO systems for the degradation of organic compounds (including contaminants of emerging concern) present in wastewater [2]. In this study, a series of pillared interlayered clays including aluminum, iron and cooper has been prepared. This work presents a comparative study of those solids on the phenol oxidation in diluted aqueous medium with hydrogen peroxide at 25°C and atmospheric pressure.
Al, mixed Al-Fe and Al-Cu pillared clays have been prepared using the conventional method in a dilute medium with two parameters added to this synthesis. The first is the cooling of clay suspension and the second one is the exchange between clay and metal solutions before pillaring.
The dispersion of the cold clay suspension, before the pillaring, increases the basal spacing and the specific surface area. Mixed Al-Fe and Al-Cu pillared clays have comparable performances in very mild reaction conditions, although they showed some differences in the H2O2 decomposition kinetics. A total conversion of H2O2 is obtained without completely phenol conversion over mixed Al-Fe pillared clays suggesting the presence of the active species in these catalysts.
Iron exchanged and post-pillared clay with mixed (Al-Fe) solution containing 10% of iron expressed as molar percentage (Fe/MR-AlFe(10)) is the most efficient for this reaction combining good catalytic activity with high stability against iron leaching (0.02%). Its shows total phenol degradation, the highest H2O2 decomposition (85.7%) and more than 80% of TOC removal after 15h of reaction.