N-methylene phosphonic chitosan aerogels for efficient capture of Cu2+ and Pb2+ from aqueous environment

In this paper, N-methylene phosphonic acid chitosan (NPCS-PEI) was synthesized from chitosan, phosphorous acid, formaldehyde and hyperbranched polyethyleneimine (PEI), and Cu2+ and Pb2+ removal performance was examined in aqueous solution. NPCS-PEI exhibited three-dimensional porous architectures, w...

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Veröffentlicht in:Carbohydrate polymers 2021-10, Vol.269, p.118355-118355, Article 118355
Hauptverfasser: Liu, Tao, Gou, Shaohua, He, Yang, Fang, Shenwen, Zhou, Lihua, Gou, Guangjun, Liu, Lang
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Sprache:eng
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Zusammenfassung:In this paper, N-methylene phosphonic acid chitosan (NPCS-PEI) was synthesized from chitosan, phosphorous acid, formaldehyde and hyperbranched polyethyleneimine (PEI), and Cu2+ and Pb2+ removal performance was examined in aqueous solution. NPCS-PEI exhibited three-dimensional porous architectures, with a specific surface area of 490.61 m2/g. The effects of pH, initial concentration, adsorption time, temperature and ionic strength on the adsorption capacity were investigated. The adsorption kinetics indicated that Cu2+ and Pb2+ adsorption onto NPCS-PEI follows a pseudo-second-order model. The adsorption isotherms agree well with the Langmuir isotherm model, and the maximum adsorption capacities of Cu2+ and Pb2+ on the NPCS-PEI are approximately 276.12 and 645.16 mg/g, respectively. The adsorption efficiency of NPCS-PEI remained above 85% after 5 adsorption-desorption successive cycles. Moreover, the NPCS-PEI aerogels had selective adsorption toward Cu2+. The FTIR and XPS analysis proved that amino, hydroxyl, and phosphonic acid groups were involved in the chelation with metal ions. [Display omitted] •NPCS-PEI aerogels containing amino, hydroxyl and phosphonic groups were prepared.•The adsorbent has excellent wettability and expansibility.•The adsorption capacity of Cu2+ and Pb2+ was 276.12 and 645.16 mg/g, respectively.•NPCS-PEI aerogels had selective adsorption toward Cu2+.
ISSN:0144-8617
1879-1344
DOI:10.1016/j.carbpol.2021.118355