Chemical crosslinking reinforced flexible cellulose nanofiber-supported cryogel
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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).
KeywordsCNF-supported cryogel Crosslinking PEI Flexibility Copper adsorption
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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