Publicação
Removal of fluoxetine from effluents using adsorbents based on walnut and almond shells
| Resumo: | Water contamination by micropollutants, especially of pharmaceutical origin, has become a growing concern in various world regions. Among these compounds, fluoxetine has been detected in water bodies, highlighting the need for effective solutions for its removal. Hence, in this research, four activated carbons were produced from almond and walnut shells, which are agro-industrial residues, and were subsequently tested for the removal of fluoxetine from aqueous solutions. Two carbons were chemically activated with zinc chloride, while the others were physically activated. The characterization of the materials revealed significant differences between the physical and chemical activation processes, directly influencing their adsorptive properties. Several characterization techniques were applied to investigate these differences, including carbonization yield, point of zero charge analysis, quantification of acidic and basic functional groups on the surface, Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA) and derivative thermogravimetric analysis (DTG), X-ray diffraction, and scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS). These characterizations provided a comprehensive understanding of the physical and chemical properties of the materials and how different activation methods affect their adsorptive capacities. Adsorption studies, including kinetic and isotherm analyses, were conducted at three temperatures (25 °C, 35 °C, and 45 °C) to determine the optimal removal conditions. The results indicated promising effectiveness, with up to 98.99% of fluoxetine removed from liquid effluents when compared to the initial concentration of 1ppm of the study. These studies suggest that activated carbons chemically produced with zinc chloride from agricultural residues can be a viable and sustainable alternative for effluent treatment, contributing to the reduction of micropollutants in water and promoting an ecological solution for biomass disposal. |
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| Autores principais: | Okon, Caio |
| Assunto: | Adsorption Fluoxetine Activated carbon Water contamination Micropollutants |
| Ano: | 2024 |
| País: | Portugal |
| Tipo de documento: | dissertação de mestrado |
| Tipo de acesso: | acesso restrito |
| Instituição associada: | Instituto Politécnico de Bragança |
| Idioma: | inglês |
| Origem: | Biblioteca Digital do IPB |
| Resumo: | Water contamination by micropollutants, especially of pharmaceutical origin, has become a growing concern in various world regions. Among these compounds, fluoxetine has been detected in water bodies, highlighting the need for effective solutions for its removal. Hence, in this research, four activated carbons were produced from almond and walnut shells, which are agro-industrial residues, and were subsequently tested for the removal of fluoxetine from aqueous solutions. Two carbons were chemically activated with zinc chloride, while the others were physically activated. The characterization of the materials revealed significant differences between the physical and chemical activation processes, directly influencing their adsorptive properties. Several characterization techniques were applied to investigate these differences, including carbonization yield, point of zero charge analysis, quantification of acidic and basic functional groups on the surface, Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA) and derivative thermogravimetric analysis (DTG), X-ray diffraction, and scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS). These characterizations provided a comprehensive understanding of the physical and chemical properties of the materials and how different activation methods affect their adsorptive capacities. Adsorption studies, including kinetic and isotherm analyses, were conducted at three temperatures (25 °C, 35 °C, and 45 °C) to determine the optimal removal conditions. The results indicated promising effectiveness, with up to 98.99% of fluoxetine removed from liquid effluents when compared to the initial concentration of 1ppm of the study. These studies suggest that activated carbons chemically produced with zinc chloride from agricultural residues can be a viable and sustainable alternative for effluent treatment, contributing to the reduction of micropollutants in water and promoting an ecological solution for biomass disposal. |
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