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

Autor: Tang J; College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China. Electronic address: Reynard_tangjuntao@126.com., Song Y; Department of Chemical Engineering, Waterloo Institute for Nanotechnology, University of Waterloo, 200 University Avenue West, Waterloo, ON, N2L 3G1, Canada., Zhao F; Laboratory of Green Chemistry, Department of Chemistry, Faculty of Technology, Lappeenranta University of Technology, Sammonkatu 12, FI-50130, Mikkeli, Finland., Spinney S; Department of Chemical Engineering, Waterloo Institute for Nanotechnology, University of Waterloo, 200 University Avenue West, Waterloo, ON, N2L 3G1, Canada., da Silva Bernardes J; Brazilian Nanotechnology National Laboratory (LNNano), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, Sao Paulo, 13083-970, Brazil. Electronic address: juliana.bernardes@lnnano.cnpem.br., Tam KC; Department of Chemical Engineering, Waterloo Institute for Nanotechnology, University of Waterloo, 200 University Avenue West, Waterloo, ON, N2L 3G1, Canada. Electronic address: mkctam@uwaterloo.ca.
Jazyk: angličtina
Zdroj: Carbohydrate polymers [Carbohydr Polym] 2019 Mar 15; Vol. 208, pp. 404-412. Date of Electronic Publication: 2018 Dec 26.
DOI: 10.1016/j.carbpol.2018.12.079
Abstrakt: 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 2 nd 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.
(Copyright © 2018 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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