Evaluation of heterogeneous catalytic ozonation process for diclofenac degradation in solutions synthetically prepared

Sodium diclofenac (DCF) is a common analgesic and anti-inflammatory drug. Due to its growth and accumulation into water bodies, it has become an environmental problem. In this work, technical and analytical DCF mineralization by means of heterogeneous catalytic ozonation was studied. The process was carried out with magnetite (Fe₃O₄) as a catalyst, which preserved its physical and chemical properties during the process. The best results of mineralization were obtained after a 40-minute treatment of a 35 mg/L analytical DCF solution, with a 0.5 g/L catalyst concentration. These results showed the highest organic load decrease, measured as dissolved organic carbon (DOC) and chemical oxygen demand (COD), with 94% and 89%, respectively. In addition, the percentage of organic load decrease was compared between the conventional and the catalyzed process. Besides, reaction products were identified by Gas Chromatography–Mass Spectrometry (GC-MS), and the catalytic properties were identified by Mössbauer spectroscopy, which showed the catalyst maintained its nature after the process. Finally, the results obtained show that the heterogeneous catalytic process could be an efficient degradation treatment for emerging contaminants such as DCF.

• Autores: Castro Botina, Jenny Alexandra; Paz Rosero, Santiago Alejandro
• Tipo de recurso: Trabajo de grado de pregrado
• Fecha de publicación: 2018
• Institución: Universidad del Valle
• Repositorio: Repositorio Digital Univalle
• Idioma: eng
• OAI Identifier: oai:bibliotecadigital.univalle.edu.co:10893/38775
• Acceso en línea: https://hdl.handle.net/10893/38775
• Palabra clave: Ozonización catalítica; Diclofenaco de sodio; Degradación de contaminantes; Contaminantes emergentes; Tratamiento de aguas residuales
• Rights: openAccess
• License: https://creativecommons.org/licenses/by-nc-nd/4.0/