Agar/graphene oxide hydrogels as nano-bioadsorbents: a comparative analysis for dye removal

• Tipo: Artigo em Revista Científica Internacional
• Data: 2023

Autores

de Araujo, CMB (Autor) Outra; Rios, AG (Autor) Outra; Alexandre Ferreira (Autor) FEUP; Sobrinho, MAD (Autor) Outra; Rodrigues, AE (Autor) Outra; Ghislandi, MG (Autor) Outra

Revista

Título: Environmental Science and Pollution Research

ISSN: 0944-1344

Editora: Springer Nature

Indexação

ISI Web of Knowledge - 0 Citações

Outras Informações

ID Authenticus: P-00Z-JWJ

DOI: 10.1007/s11356-023-31158-4

Abstract (EN): Nano-biocomposite hydrogel samples were produced using graphene oxide (GO) and agar and applied as adsorbents of organic components in water. The hydrogels were prepared by varying the wt% of Agar and GO. The samples were characterized, and batch adsorption experiments evaluated the effect of initial pH, equilibrium isotherms, and kinetics for the adsorption of the anionic dye Acid Orange 7 (AO) and the cationic dyes Nile Blue A (NB) and methylene blue (MB) in an aqueous medium. Overall, both hydrogel samples exhibited satisfactory results for removing NB and MB; however, there was no effective removal for the anionic dye AO. Adsorption equilibrium isotherms were obtained, and Freundlich, Langmuir, and Sips models were fitted to the experimental equilibrium data; moreover, kinetic data were adjusted to driving force models and particle mass balance. The maximum experimental adsorption capacities, 141.48 mg center dot g-1 (MB) and 284.69 mg center dot g-1 (NB), were obtained, on a dry basis, for the sample produced with 70 wt% of agar and 30 wt% of GO. Both hydrogels exhibited remarkable regenerative potential for NB and MB, with the adsorption capacity remaining constant, even after five adsorption/desorption cycles.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 13