resumo
The main goal of this work was to produce an easily recoverable waste-based magnetic activated carbon (MAC) for an efficient removal of the antiepileptic pharmaceutical carbamazepine (CBZ) from wastewater. For this purpose, the synthesis procedure was optimized and a material (MAC4) providing immediate recuperation from solution, remarkable adsorptive performance and relevant properties (specific surface area of 551 m(2) g(-1) and saturation magnetization of 39.84 emu g(-1)) was selected for further CBZ kinetic and equilibrium adsorption studies. MAC4 presented fast CBZ adsorption rates and short equilibrium times (< 30-45 min) in both ultrapure water and wastewater. Equilibrium studies showed that MAC4 attained maximum adsorption capacities (q(m)) of 68 +/- 4 mg g(-1) in ultrapure water and 60 +/- 3 mg g(-1) in wastewater, suggesting no significant interference of the aqueous matrix in the adsorption process. Overall, this work provides evidence of potential application of a waste-based MAC in the tertiary treatment of wastewaters.
palavras-chave
TREATMENT PLANTS; PILOT-SCALE; ADSORPTION; PHARMACEUTICALS; MICROPOLLUTANTS; ADSORBENTS; OZONATION; KINETICS; RISK; CONTAMINANTS
categoria
Environmental Sciences
autores
Pereira, D; Rocha, LS; Gil, MV; Otero, M; Silva, NJO; Esteves, VI; Calisto, V
nossos autores
Luciana Sarabando da Rocha
Bolseiro de pós-Doutoramento
Nuno João Silva
Investigador Principalagradecimentos
This work is a contribution to the project WasteMAC (POCI-01-0145-FEDER-028598) funded by FCT - Fundacao para a Ciencia e a Tecnologia, I.P., through national funds, and the co-funding by the FEDER, within the PT2020 Partnership Agreement and Compete 2020. Thanks are also due for the financial support to CESAM (UID/AMB/50017/2019), to FCT/MCTES through national funds, and the co-funding by the FEDER, within the PT2020 Partnership Agreement and Compete 2020. Marta Otero and Diogo Pereira thank FCT funding through IF Program (IF/00314/2015). Vania Calisto is thankful to FCT for the Scientific Employment Stimulus support (CEECIND/00007/2017). Maria V. Gil acknowledges support from a Ramon y Cajal grant (RYC-2017-21937) of the Spanish government, co-financed by the European Social Fund (ESF).