Effect of teak wood lignocellulose pretreatment on the performance of cellulose-graft-(net-poly(acrylamide-co-acrylic acid)) for water absorption and dye removal
Por:
Vega-Hernández, MA, Munguía-Quintero, MF, Rosas-Aburto, A, Alcaraz-Cienfuegos, J, Valdivia-López, MD, Hernández-Luna, MG, Vivaldo-Lima, E
Publicada:
1 ago 2024
Ahead of Print:
1 jun 2024
Resumen:
Cellulose modified hydrogels can be produced directly from raw biopolymers in novel cellulose solvents such as NaOH/urea aqueous solution. The effect of cellulose characteristics on the synthesis of a cellulose-graft-(net-poly (acrylamide-co-acrylic acid)) and its performance as water absorbent/methylene blue dye removal material is analyzed. Three cellulose samples, one analytical grade and two obtained from teak wood sawdust with different pretreatments (one alkaline and the other, a novel one known as (gas phase) acid pretreatment) were compared. The starting raw celluloses were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), X-ray diffraction (XRD) and viscosity in cupri ethylenediamine hydroxide (CED) solution, whereas the chemically modified materials were characterized by SEM, FTIR, and TGA. The pretreatment used influences composition, crystallinity index and degree of polymerization (DP) of the cellulose obtained. The modified material produced with cellulose from alkaline pretreatment showed the highest swelling ratio in water absorption tests at room temperature (12,714 %); in contrast, the one with cellulose from acid pretreatment showed the lowest swelling ratio (7,470 %). However, this difference is not so significative in dye removal tests, where absorption capacity is 139 and 140 mg/g, respectively. The results indicate that cellulose composition, particularly structures with significant hemicellulose and lignin remaining content, has a major effect on the performance of modified materials for water absorption, and degree of polymerization has a major effect on adsorption capacity of methylene blue.
Filiaciones:
Vega-Hernández, MA:
Univ Nacl Autonoma Mexico, Fac Quim FQ, Dept Ingn Quim, Ciudad De Mexico 04510, Mexico
Munguía-Quintero, MF:
Univ Nacl Autonoma Mexico, Fac Quim FQ, Dept Ingn Quim, Ciudad De Mexico 04510, Mexico
Rosas-Aburto, A:
Univ Nacl Autonoma Mexico, Fac Quim FQ, Dept Ingn Quim, Ciudad De Mexico 04510, Mexico
Alcaraz-Cienfuegos, J:
Univ Nacl Autonoma Mexico, Fac Quim FQ, Dept Ingn Quim, Ciudad De Mexico 04510, Mexico
Valdivia-López, MD:
Univ Nacl Autonoma Mexico, Fac Quim, Dept Alimentos & Biotecnol, Ciudad De Mexico 04510, Mexico
Hernández-Luna, MG:
Univ Nacl Autonoma Mexico, Fac Quim FQ, Dept Ingn Quim, Ciudad De Mexico 04510, Mexico
Vivaldo-Lima, E:
Univ Nacl Autonoma Mexico, Fac Quim FQ, Dept Ingn Quim, Ciudad De Mexico 04510, Mexico
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