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Polyethyleneimine‐Based Cryogels Enabling the Selective and Reversible Adsorption of Chlorine
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Polyethyleneimine‐Based Cryogels Enabling the Selective and Reversible Adsorption of Chlorine
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Journal Article
Polyethyleneimine‐Based Cryogels Enabling the Selective and Reversible Adsorption of Chlorine
2025
Overview
Herein hyperbranched polyethyleneimine (hPEI) cryogels are reported for the selective and reversible adsorption of elemental chlorine. The cryogels are prepared in an aqueous solution by crosslinking with glutaraldehyde at subzero temperatures. The final macroporous composites bearing ammonium chloride groups are obtained after freeze‐drying. The cryogels CG1[Cl]–CG3[Cl] adsorb chlorine with capacities of 0.22–0.26 g Cl2/g cryogel as an average over three adsorption‐desorption cycles. The adsorption process is based on the reversible and selective halogen bonding of chlorides (Cl−) with chlorine (Cl2) forming the corresponding trichloride ([Cl3]−) species, indicated by Raman spectroscopy. The reversibility of chlorine adsorption is shown by applying heat and vacuum to the loaded cryogel CG1[Cl3] releasing 63% of the adsorbed chlorine within 3 h and 72% within 16 h. The unique ability to selectively adsorb chlorine in the presence of other gases is successfully employed for the selective adsorption of chlorine from a gas mixture, potentially enabling the recycling of chlorine from tail gas streams. Quaternized polyethyleneimine‐based cryogels CG[Cl] are used for the reversible adsorption of chlorine. The chlorine is adsorbed by chemisorption forming the corresponding trichlorides CG[Cl3] by halogen bonding. Using these cryogels, chlorine is selectively adsorbed in the presence of oxygen and nitrogen potentially enabling gas separation processes in the chemical industry.
Publisher
John Wiley & Sons, Inc,John Wiley and Sons Inc,Wiley
Subject
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