Compressible cellulose nanofibril (CNF) based aerogels produced via a bio-inspired strategy for heavy metal ion and dye removal

Autor(es)

Tang, Juntao ^[1] ; Song, Yang ^[2] ; Zhao, Feiping ^[3] ; Spinney, Stewart ^[2] ; Bernardes, Juliana da Silva ^[4] ; Tam, Kam Chiu ^[2]

Afiliação do(s) autor(es)

^[1] Cent S Univ, Coll Chem & Chem Engn, Changsha 410083, Hunan - Peoples R China

^[2] Univ Waterloo, Waterloo Inst Nanotechnol, Dept Chem Engn, 200 Univ Ave West, Waterloo, ON N2L 3G1 - Canada

^[3] Lappeenranta Univ Technol, Fac Technol, Dept Chem, Lab Green Chem, Sammonkatu 12, FI-50130 Mikkeli - Finland

^[4] Brazilian Ctr Res Energy & Mat CNPEM, Brazilian Nanotechnol Natl Lab LNNano, BR-13083970 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Carbohydrate Polymers; v. 208, p. 404-412, MAR 15 2019.
• Citações Web of Science: 11

Resumo

A sustainable nanomaterial, cellulose nanofibril (CNF) was used to prepare aerogel sorbents to remove various contaminants in wastewater. A mussel-inspired coating strategy was used to introduce polydopamine onto the surface of CNFs, which were cross-linked with polyethylenimine (PEI) to form the aerogels. The synthetic procedure was optimized to achieve a minimal consumption of raw materials to produce a robust porous structure. The aerogels possessed a low density (25.0 mg/cm(3)), high porosity (98.5%) and shape recovery in air and water. Adsorption studies were conducted on two representative contaminants, Cu (II) and methyl orange (MO). The kinetic data obeyed the pseudo 2nd order kinetic model and the mechanism of adsorption could be described by the intra-particle diffusion model. The Langmuir model fitting yielded a maximum adsorption capacity of 103.5 mg/g and 265.9 mg/g for Cu (II) and MO, respectively. The effects of pH on the adsorption performance were evaluated, confirming that the aerogels can maintain a high adsorption capacity over a wide pH range. (AU)

• Processo FAPESP: 17/50133-8 - Gel behavior of cellulose nanofiber smart materials
• Beneficiário: Juliana da Silva Bernardes
• Linha de fomento: Auxílio à Pesquisa - Regular