Abstract
A robust and flexible cellulose nanofiber (CNF)-supported cryogel was prepared by chemical crosslinking method using γ-glycidoxypropyltrimethoxysilane (GPTMS) and branched polyethylenimine (PEI). FT-IR, elemental analysis, EDS and solid state 13C NMR analysis revealed that the PEI had been successfully modified on cellulose via reacting with GPTMS. The obtained flexible cryogel displayed a three-dimensional structure composed of thin sheet. The maximal shape recovery of the CNF-supported cryogel from a 50% compression strain was up to 93% of its original thickness. The cryogel contained abundant amino groups and proved to be efficient in removing Cu2+ from solution with a maximum Cu2+ uptake of 138 mg/g. The adsorption kinetics curve fitted the pseudo-second-order model and the equilibrium absorption capacity fitted the Langmuir model. Moreover, adsorption capacity of the cryogel was up to 75% after four adsorption–desorption cycles (15 days).
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Acknowledgments
This work was financially supported by National Natural Science Foundation of China (No. 51403035), Programme of Introducing Talents of Discipline to Universities (No. 105-07-005735) and the Fundamental Research Funds for the Central Universities (No. 16D110510).
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Cheng, H., Li, Y., Wang, B. et al. Chemical crosslinking reinforced flexible cellulose nanofiber-supported cryogel. Cellulose 25, 573–582 (2018). https://doi.org/10.1007/s10570-017-1548-7
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DOI: https://doi.org/10.1007/s10570-017-1548-7