| Texto completo | |
| Autor(es): |
Briao, Giani de Vargas
;
Queiroz, Bianca Groner
;
Ferreira, Rafaela Reis
;
Rosa, Derval dos Santos
;
Frollini, Elisabete
Número total de Autores: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | International Journal of Biological Macromolecules; v. 321, p. 18-pg., 2025-09-25. |
| Resumo | |
Developing bio-based hydrogels offers a sustainable alternative to traditional fossil-based materials in wastewater treatment, particularly for absorbing heavy metals. This study focused on creating hydrogels from the components of sisal fibers, specifically cellulose (around 59 %), hemicelluloses (29 %), and lignin (12 %), through a deconstruction process using cupriethylenediamine hydroxide (CUEN) as the solvent and water as the coagulation medium. CUEN deconstructed 1 g and 2 g of sisal fibers; in total mass, the dissolution efficiency achieved was 73.7 % (cellulose and hemicelluloses) and 52.4 %, respectively. Lignin remained suspended in the medium alongside fractions of hemicelluloses and cellulose. Macromolecules dissolved and suspended in the medium were incorporated into the hydrogels. The hydrogel made from 1 g of sisal showed a higher water sorption capacity (5076.4 %). Meanwhile, the one created using 2 g of sisal demonstrated superior crystallinity, compression, and rheological properties, with a compressive elastic modulus of 62.4 kPa and a shear storage modulus of 416.8 kPa. Sisal_2_hydro also presented higher BET surface area and pore volume, enabling them to reach sorption capacities of up to 0.41 mmol/g for heavy metals, specifically Cu(II), Ni(II), Zn(II), Cd(II), Mn(II), and Cr(VI). The deconstruction of sisal fibers successfully produced hydrogels that demonstrated potential for sorbing heavy metals. (AU) | |
| Processo FAPESP: | 23/07447-2 - Materiais porosos baseados em polissacarídeos para tratamento de águas contaminadas por metais |
| Beneficiário: | Giani de Vargas Brião |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 20/13703-3 - Materiais porosos ecológicos para a recuperação e reavaliação de metais recuperados de água contaminada |
| Beneficiário: | Derval dos Santos Rosa |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |