Natural iron ligands promote a metal-based oxidation mechanism for the Fenton reaction in water environments
| Autor: | Davide Vione, Marco Minella, Stefanos Giannakis, Marco Pazzi, Alberto Tiraferri, Cesar Pulgarin, Giulio Farinelli |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Environmental Engineering
electro-fenton Cyclohexane ph Health Toxicology and Mutagenesis 0211 other engineering and technologies Cyclohexanol Cyclohexanone Iron ligands 02 engineering and technology 010501 environmental sciences 01 natural sciences Catalysis Metal chemistry.chemical_compound photo-fenton Environmental Chemistry oxidant Free radical mechanism Waste Management and Disposal Metal-based catalysis degradation 0105 earth and related environmental sciences 021110 strategic defence & security studies hydroxyl radicals hydrogen-peroxide Advanced oxidation process Advanced oxidation Fenton mechanism Iron ligands Free radical mechanism Metal-based catalysis Pollution Combinatorial chemistry Fenton mechanism chemistry Mechanism (philosophy) visual_art visual_art.visual_art_medium Advanced oxidation systems Degradation (geology) activation dioxygen |
| Popis: | The Fenton reaction is an effective advanced oxidation process occurring in nature and applied in engineering processes toward the degradation of harmful substances, including contaminants of emerging concern. The traditional Fenton application can be remarkably improved by using iron complexes with organic ligands, which allow for the degradation of contaminants at near-neutral pH and for the reduction of sludge production. This work discusses the mechanisms involved both in the classic Fenton process and in the presence of ligands that coordinate iron. Cyclohexane was selected as mechanistic probe, by following the formation of the relevant products, namely, cyclohexanol (A) and cyclohexanone (K). As expected, the classic Fenton process was associated with an A/K ratio of approximately 1, evidence of a dominant free radical behavior. Significantly, the presence of widely common natural and synthetic carboxyl ligands selectively produced mostly the alcoholic species in the first oxidation step. A ferryl-based mechanism was thus preferred when iron complexes were formed. Common iron ligands are here proven to direct the reaction pathway towards a selective metal-based catalysis. Such a system may be more easily engineered than a free radical-based one to safely remove hazardous contaminants from water and minimize the production of harmful intermediates. |
| Databáze: | OpenAIRE |
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