Bifunctional green nanoferrites as catalysts for simultaneous organic pollutants reduction and hydrogen generation: Upcycling strategy.

Autor: Oliveira RVM; Department of Chemistry, Federal University of Sergipe (UFS), São Cristóvão, SE, 49100-000, Brazil. Electronic address: rhayza_7@hotmail.com., Costa JAS; Department of Chemistry, Federal University of Sergipe (UFS), São Cristóvão, SE, 49100-000, Brazil; National Institute for Alternative Technologies of Detection, Toxicological Evaluation and Removal of Micropollutants and Radioactives (INCT-DATREM), Institute of Chemistry, UNESP, P.O. Box 355, Araraquara, SP, 14800-900, Brazil., Romão LPC; Department of Chemistry, Federal University of Sergipe (UFS), São Cristóvão, SE, 49100-000, Brazil; National Institute for Alternative Technologies of Detection, Toxicological Evaluation and Removal of Micropollutants and Radioactives (INCT-DATREM), Institute of Chemistry, UNESP, P.O. Box 355, Araraquara, SP, 14800-900, Brazil.
Jazyk: angličtina
Zdroj: Journal of environmental management [J Environ Manage] 2024 Feb; Vol. 351, pp. 119994. Date of Electronic Publication: 2023 Dec 30.
DOI: 10.1016/j.jenvman.2023.119994
Abstrakt: The upcycling strategy is an approach that includes the conversion of waste into new higher value-added products. This study reports on a new methodology for the environmentally friendly synthesis of MFe 2 O 4 spinel nanoferrites (M = Co, Cu, Fe and Mn) to be used as catalysts applied in the upcycling method. Thus, the reduction of 4-nitrophenol (4-NP), methyl orange, and methyl red to commercially valuable compounds was evaluated, as well as the simultaneous generation of hydrogen in a short time. Therefore, an eco-friendly synthesis was proposed, according to the 12 principles of green chemistry and sustainability. Product were obtained with satisfactory properties in terms of crystallinity, magnetic particle size, and magnetization. The materials exhibited excellent performance in catalytic reduction of 4-NP, whose reduction time decreased in the order MnFe 2 O 4  > Fe 3 O 4  > CoFe 2 O 4  > CuFe 2 O 4 . This behavior highlighted the CuFe 2 O 4 nanoferrite, which achieved 4-NP reduction in just 10 s. It proved that it could also be reused for 10 consecutive cycles while maintaining its crystalline structure. The catalyst was also effective in the reduction of azo dyes and subsequent production of substituted aromatic compounds suitable for use in chemical processes. Under the optimized conditions, the green CuFe 2 O 4 catalyst was effective in producing hydrogen by hydrolysis. HGR and activation energy (E a ) values were of the order of 19,600 mL g -1  min -1 and 25.5 kJ mol -1 , respectively. The results demonstrated the potential of this simple strategy for the environmental pollutant elimination and power generation.
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 © 2023 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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