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Authors
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Privar, Y. ; Malakhova, I. ; Pestov, A. ; Fedorets, A. ; Azarova, Y. ; Schwarz, S. ; Bratskaya, S.
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Title
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Polyethyleneimine cryogels for metal ions sorption
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Date
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15.02.2018
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Number
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53849
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Abstract
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Polyethyleneimine (PEI) cryogels have been fabricated using poly(ethylene glycol) diglycidyl ether (DGE-PEG), 1,4-butanediol diglycidyl ether (DGE-1,4-BD), and glutaric aldehyde (GA) as cross-linking agents. The rate of PEI cross-linking changes in the order GA·>·DGE-1,4-BD·>·DGE-PEG. The established correlations between the modification degree, swelling, and static ion-exchange capacity revealed a tendency of diglycidyl ethers, especially DGE-1,4-BD, to graft as a side chain to PEI in alkaline media. Low reactivity of cross-linkers at temperatures below zero resulted in lower modification degree and higher sorption capacities of PEI cryogels in comparison with PEI cross-linked at room temperature. Due to the difference in mechanisms of sorption of metal cations and anions, PEI cryogels cross-linked with DGE-1,4-BD and DGE-PEG were the most efficient for sorption of Hg(II) as [HgCl4]2- complex and Cu(II) ions, respectively. The morphology of PEI cryogels depends on the type of the cross-linking agent, cross-linker/PEI molar ratio, and concentration of PEI solution; the pore volume of cryogels obtained under the same conditions decreased in the order GA·>·DGE-1,4-BD·>·DGE-PEG.
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Publisher
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Chemical Engineering Journal
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Wikidata
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Citation
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Chemical Engineering Journal 334 (2018) 1392-1398
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DOI
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https://doi.org/10.1016/j.cej.2017.11.097
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Tags
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