Journal
CARBOHYDRATE POLYMERS
Volume 267, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2021.118233
Keywords
Adsorption; Aerogel; Cellulose nanofibers; Coordination mechanism; Uranium extraction
Categories
Funding
- National Nature Science Foundation of China [21978307, 22078347]
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University
- Science and Technology Program of Guiyang City [[2020] 188]
- Science and Technology Program of Guanshanhu District [03]
- Huzhou Science K Ltd.
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Cellulose nanofibers aerogel with high metal-chelating capacity and selective uranium adsorption ability was successfully prepared via a simple method in this study. The aerogel showed excellent regeneration ability and potential for efficient biomass-based adsorbents development.
Cellulose nanofibers (CNFs) aerogel was prepared via simple covalent crosslinking and freeze-drying method. The porous cellulose aerogel possessed high specific surface area and high metal-chelating capacity, which showed fast adsorption kinetics and high adsorption capacity (440.60 mg g-1) in static uranium adsorption process. In the dynamic filtration system, the maximum adsorption capacity reached 194 mg g-1 with the initial concentration of 10 mg L-1. In addition, the CNFs aerogel possessed excellent selectivity and good regeneration ability for uranium adsorption. The integrated analyses of attenuated total reflection Fourier transform infrared (ATR-FTIR), X-Ray photoelectron spectroscopy (XPS) and extended X-ray absorption fine structure (EXAFS) suggested that the predominant UO22+ species formed inner-sphere surface complexes with two active carboxyl groups in the coordination model. This strategy may provide a sustainable route for development of efficient biomass-based adsorbents for selective uranium removal from aqueous solution.
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