Ex-situ magnetic activated carbon for the adsorption of three pharmaceuticals with distinct physicochemical properties from real wastewater
[EN] Pharmaceuticals are able to evade conventional wastewater treatments and therefore, are recurrently found in the environment with proven potential to cause harm to human and wildlife. Adsorption onto activated carbon (AC) is a promising complement. However, AC production from non-renewable reso...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2023 |
| País: | España |
| Institución: | Universidad de León |
| Repositorio: | BULERIA. Repositorio Institucional de la Universidad de León |
| OAI Identifier: | oai:buleria.unileon.es:10612/25245 |
| Acceso en línea: | https://www.sciencedirect.com/science/article/pii/S0304389422020520 https://hdl.handle.net/10612/25245 |
| Access Level: | acceso abierto |
| Palabra clave: | Biología Química Magnetic porous carbons Wastewater treatment Magnetic recuperation Emerging contaminants Paper mill sludge valorisation 2210 Química Física 3328.01 Absorción 2414.01 Antibióticos 3308.07 Eliminación de Residuos 3308.11 Control de la Contaminación del Agua |
| Sumario: | [EN] Pharmaceuticals are able to evade conventional wastewater treatments and therefore, are recurrently found in the environment with proven potential to cause harm to human and wildlife. Adsorption onto activated carbon (AC) is a promising complement. However, AC production from non-renewable resources and its difficult after-use recuperation are prohibitive. Hence, a waste-based magnetic activated carbon (MAC) was produced from paper mill sludge, via an ex-situ synthesis, for the adsorptive removal of carbamazepine (CBZ), sulfamethoxazole (SMX) and ibuprofen (IBU) from ultrapure water and wastewater. The MAC was obtained through the promotion of electrostatic interactions between magnetic and activated carbon particles in a water suspension at controlled pH between the points of zero charge of both surfaces. The optimized condition (MACX3) presented remarkable properties regarding specific surface area (SBET=795 m2 g−1) and saturation magnetization (MS=19 emu g−1). Kinetic and equilibrium adsorption studies were performed under batch conditions. Adsorption equilibrium was reached in up to 30 min for all pharmaceuticals in both matrices, proving the low dependence on the adsorbate and the broad applicability of MACX3 in pharmaceutical adsorption. Regarding equilibrium experiments, high Langmuir maximum adsorption capacities ( ) were achieved in ultrapure water (up to 711 ± 40 µmol g−1). Equilibrium studies in wastewater revealed a decay in when compared to ultrapure water: 28% for CBZ (468 ± 20 µmol g−1 (111 ± 5 mg g−1)), 78% for SMX (145 ± 10 µmol g−1 (37 ± 3 mg g−1)) and 62% for IBU (273 ± 8 µmol g−1 (56 ± 2 mg g−1)), attributed to the wastewater pH, which dictates the speciation of the pharmaceuticals and controls electrostatic interactions between pharmaceuticals and MAC, and to competition effects by organic matter. It was demonstrated the promising applicability of a waste-based ex-situ MAC, rapidly retrievable from water, as an alternative tertiary wastewater treatment for pharmaceuticals removal |
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