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oai:gredos.usal.es:10366/1599842025-04-30T20:18:34Zcom_10366_4377com_10366_4349com_10366_3946com_10366_3823col_10366_4378

Regeneration and reuse of magnetic particles for contaminant degradation in water Hernández, Lorenzo Augusto, Paulo A. Castelo-Grande, Teresa Barbosa, Domingos Colorantes Química Partículas Aguas residuales Estaciones de tratamiento Waste Water 3308.10 Tecnología de Aguas Residuales 3308.07 Eliminación de Residuos 23 Química aguas residuales [EN] Fenton reaction is an oxidation process of interest in wastewater treatment because of its ability to degrade organic compounds. Iron-based magnetic particles can be a very useful catalyst when using heterogeneous Fenton process. The major problem of this heterogeneous process is the saturation of the Fe 3+ on the surface, which limits the process. In this study, the possibility of using magnetite particles as a substrate is presented, increasing its degradation efficiency by Fenton reaction through a regeneration process that achieves the electronic reduction of its surface using reducing agents. The results indicate that the regeneration process is quite effective, increasing the efficiency of the degradation of Methylene Blue up to 99%. The concentration of magnetite is the most influential factor in the efficiency of the reaction, while the regeneration time and the concentration of reducing agent do not significantly affect the results considering the range used. The presence of mechanical stirring may adversely affect the reaction in the long term. Increasing the oxidant agent concentration reduces the initial speed of the reaction but not the long-term efficiency. The use of hydrazine in this process allows the successive reuse of these particles maintaining a high percentage of elimination of methylene blue, above 70% even after 10 uses, compared to an elimination below 20% for particles not regenerated after the second use and for particles regenerated with ascorbic acid after the eighth use. Publicación en abierto financiada por la Universidad de Salamanca como participante en el Acuerdo Transformativo CRUE-CSIC con Elsevier, 2021-2024 2024-10-07T08:27:23Z 2024-10-07T08:27:23Z 2021-02-27 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Hernández, L., Augusto, P. A., Castelo-Grande, T., & Barbosa, D. (2021). Regeneration and reuse of magnetic particles for contaminant degradation in water. Journal of Environmental Management, 285, 112155. 0301-4797 http://hdl.handle.net/10366/159984 10.1016/j.jenvman.2021.112155 1095-8630 eng https://doi.org/10.1016/j.jenvman.2021.112155 Atribución 4.0 Internacional http://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess application/pdf Elsevier https://gredos.usal.es/bitstream/10366/159984/5/4.pdf.jpg Hispana TEXT http://creativecommons.org/licenses/by/4.0/ Gredos. Repositorio Documental de la Universidad de Salamanca http://hdl.handle.net/10366/159984