Dual nanofibrillar-based bio-sorbent films composed of nanocellulose and lysozyme nanofibrils for mercury removal from spring waters
| Autor: | Elaine Fabre, Carla Vilela, Maria E. Pereira, Nuno Silva, Carmen S. R. Freire, Paula Figueira, Ricardo J.B. Pinto, Armando J. D. Silvestre, Isabel M. Marrucho |
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| Rok vydání: | 2020 |
| Předmět: |
Sorbent
Polymers and Plastics Groundwater remediation Nanofibers chemistry.chemical_element Nanogels 02 engineering and technology 010402 general chemistry 01 natural sciences Nanocellulose Water Purification chemistry.chemical_compound Materials Chemistry Cellulose Aqueous solution Drinking Water Organic Chemistry Mercury 021001 nanoscience & nanotechnology 0104 chemical sciences Mercury (element) Isoelectric point chemistry Chemical engineering Chemisorption Muramidase 0210 nano-technology Water Pollutants Chemical |
| Zdroj: | Carbohydrate polymers. 238 |
| ISSN: | 1879-1344 |
| Popis: | 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 μg 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 μg L−1). Therefore, the CNFs/LNFs bio-sorbents might be a solution to treat low-concentrated mercury-contaminated waters. |
| Databáze: | OpenAIRE |
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