Naturally Hydrophobic Foams from Lignocellulosic Fibers Prepared by Oven-Drying

Autor(es)

Ferreira, Elisa S. ^{[1, 2]} ; Cranston, Emily D. ^{[2, 3, 4]} ; Rezende, Camila A. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Inst Chem, BR-13083970 Campinas, SP - Brazil

^[2] McMaster Univ, Dept Chem Engn, Hamilton, ON L8S 4L7 - Canada

^[3] Univ British Columbia, Dept Wood Sci, Vancouver, BC V6T 1Z4 - Canada

^[4] Univ British Columbia, Dept Chem & Biol Engn, Vancouver, BC V6T 1Z4 - Canada

• Tipo de documento: Artigo Científico
• Fonte: ACS SUSTAINABLE CHEMISTRY & ENGINEERING; v. 8, n. 22, p. 8267-8278, JUN 8 2020.
• Citações Web of Science: 0

Resumo

Lignocellulosic sugarcane biomass underwent an very low apparent density (0.09 g/cm(3)) were easily obtained by alkaline treatment for partial lignin extraction and then foams with oven-drying aqueous dispersions of fibers. The fiber networks were covalently reinforced through cross-linking by heating the dried material in the presence of citric acid. The lignocellulosic foams were naturally hydrophobic (water contact angle = 117 degrees), without requiring any further chemical modification. The hydrophobicity is attributed to the combination of (1) residual lignin, (2) redeposited lignin that has undergone thermal treatment, (3) the fiber and foam surface roughness, and (4) the structure's ability to trap air. The cross-linked fiber networks showed shape-recovery properties under compressive stress, high absorption capacity, and mechanical resistance when immersed in water and oil. This work demonstrates that lignocellulosic foams from sugarcane bagasse, processed following low cost and green methods, are promising for selective removal of hydrophobic compounds in aqueous environments and in a range of insulating and packaging products. (AU)

• Processo FAPESP: 16/13602-7 - Estudo sobre estratégias para o aproveitamento integral da biomassa lignocelulósica
• Beneficiário: Camila Alves de Rezende
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOEN - Regular
• Processo FAPESP: 18/23769-1 - Obtenção e aplicações de nanoestruturas provenientes de biomassa vegetal
• Beneficiário: Camila Alves de Rezende
• Modalidade de apoio: Auxílio à Pesquisa - Regular