Dual nanofibrillar-based bio-sorbent films composed of nanocellulose and lysozyme nanofibrils for mercury removal from spring waters
authors Silva, NHCS; Figueira, P; Fabre, E; Pinto, RJB; Pereira, ME; Silvestre, AJD; Marrucho, IM; Vilela, C; Freire, CSR
nationality International
journal CARBOHYDRATE POLYMERS
author keywords Bio-sorbents; Cellulose nanofibrils; Lysozyme nanofibrils; Nanostructured films; Water remediation; Mercury removal
keywords CELLULOSE; NANOMATERIALS; ADSORPTION; HG(II); OXIDE; IONS
abstract The present study explores the preparation of dual nanofibrillar-based bio-sorbent films composed of cellulose nanofibrils (CNFs) and lysozyme nanofibrils (LNFs) for application in the removal of Hg(II) from aqueous solutions. The free-standing films were fabricated via simple vacuum filtration of water suspensions of CNFs and LNFs and disclose good mechanical and thermal properties. The Hg(II) removal efficiency was evaluated by atomic fluorescence spectroscopy in ultra-pure and natural spring waters contaminated with environmental realistic levels of mercury (50 mu g L-1). The removal efficiency is pH-dependent reaching a maximum of 99 % after 24 h at a pH value close to the isoelectric point of the protein. Under the experimental conditions, the sorption kinetics are well described by the pseudo-second-order and Elovich models, suggesting a chemisorption mechanism. These results demonstrate the ability of the dual nanofibrillar-based films to remove Hg(II) from water samples reaching a residual concentration lower than the guideline value for water intended for human consumption (1 mu g L-1). Therefore, the CNFs/LNFs bio-sorbents might be a solution to treat low-concentrated mercury-contaminated waters.
publisher ELSEVIER SCI LTD
issn 0144-8617
year published 2020
volume 238
digital object identifier (doi) 10.1016/j.carbpol.2020.116210
web of science category Chemistry, Applied; Chemistry, Organic; Polymer Science
subject category Chemistry; Polymer Science
unique article identifier WOS:000526413700032

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