| Texto completo | |
| Autor(es): |
de Farias, Marina Barbosa
;
Prediger, Patricia
;
Vieira, Melissa Gurgel Adeodato
Número total de Autores: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | SURFACES AND INTERFACES; v. 74, p. 13-pg., 2025-10-01. |
| Resumo | |
A magnetic multifunctional material (mCS@rGO) was developed and used to remove phenol from water through adsorption and Fenton-based degradation processes. The adsorption performance of the mCS@rGO beads towards phenol was evaluated through kinetic, equilibrium, and thermodynamic analyses. An adsorption capacity of 50.1 mg/g and a removal rate of 55 % were obtained. The kinetic data showed that multiple adsorption mechanisms and rate-limiting steps may be involved. The equilibrium data were most accurately described by the Sips isothermal model. Thermodynamic parameters indicated that the process is spontaneous and endothermic. The beads were also used as catalysts in Fenton-type processes. The influence of process variables on degradation performance was assessed through a factorial design, which revealed that the optimal conditions were an H2O2:phenol molar ratio of 25:1, a catalyst dosage of 1.5 g/L, and a solution pH of 4.95. Then, a heterogeneous Fenton-type process, a heterogeneous sono-Fenton-type process, and a combination of adsorption and oxidation processes were evaluated, yielding removals of 63 %, 83 %, and 91 %, respectively. The best performance, observed for the adsorption/heterogeneous sono-Fenton-type system, confirmed the synergistic effect of the combined techniques. Characterization analyses revealed no significant changes in the composition of mCS@rGO after the processes. Phenol removal was suggested to occur in two sequential stages: adsorption onto the beads via hydrogen bonding and pi-pi interactions, followed by oxidative reactions. (AU) | |
| Processo FAPESP: | 19/11353-8 - Centro Brasileiro de Pesquisa em Água (BWRC) |
| Beneficiário: | Lauro Tatsuo Kubota |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa Centros de Pesquisa Aplicada |
| Processo FAPESP: | 22/14834-0 - Síntese de novos nanoadsorventes através de protocolos verdes e suas aplicações na remoção de poluentes em águas |
| Beneficiário: | Patricia Prediger |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 23/09491-9 - Desenvolvimento de adsorventes avançados à base de nanomateriais de carbono para aplicação na remediação de poluentes presentes em "água produzida" por adsorção e processos oxidativos avançados |
| Beneficiário: | Melissa Gurgel Adeodato Vieira |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 23/02041-8 - Preparação de membranas poliméricas a base de MOF contendo nióbio por rotofiação e sua aplicação na remoção de contaminantes em água |
| Beneficiário: | Natália Gabriele Camparotto |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |