Environment-friendly nanosponges, having a high content of carboxyl groups, were synthesized by crosslinking β-cyclodextrin and linecaps, a highly soluble pea starch derivative, with citric acid in water. Additionally, pyromellitic nanosponges were prepared by reacting β-cyclodextrin and linecaps with pyromellitic dianhydride in dimethyl sulfoxide and used in comparison with the citric nanosponges. After ion-exchange of the carboxyl groups H+ with sodium ions, the ability of the nanosponges to sequester heavy metal cations was investigated. At a metal concentration of 500 ppm, the pyromellitate nanosponges exhibited a higher retention capacity than the citrate nanosponges. At lower metal concentrations (≤50 ppm) both the citrate and the pyromellitate nanosponges showed high retention capacities (up to 94% of the total amount of metal), while, in the presence of interfering sea water salts, the citrate nanosponges were able to selectively adsorb a significantly higher amount of heavy metals than the pyromellitate nanosponges, almost double in the case of Cu2+.

Eco-Friendly β-cyclodextrin and Linecaps Polymers for the Removal of Heavy Metals

Rubin Pedrazzo, Alberto;Caldera, Fabrizio;Musso, Giorgia;Dhakar, Nilesh Kumar;Cecone, Claudio;Trotta, Francesco
2019

Abstract

Environment-friendly nanosponges, having a high content of carboxyl groups, were synthesized by crosslinking β-cyclodextrin and linecaps, a highly soluble pea starch derivative, with citric acid in water. Additionally, pyromellitic nanosponges were prepared by reacting β-cyclodextrin and linecaps with pyromellitic dianhydride in dimethyl sulfoxide and used in comparison with the citric nanosponges. After ion-exchange of the carboxyl groups H+ with sodium ions, the ability of the nanosponges to sequester heavy metal cations was investigated. At a metal concentration of 500 ppm, the pyromellitate nanosponges exhibited a higher retention capacity than the citrate nanosponges. At lower metal concentrations (≤50 ppm) both the citrate and the pyromellitate nanosponges showed high retention capacities (up to 94% of the total amount of metal), while, in the presence of interfering sea water salts, the citrate nanosponges were able to selectively adsorb a significantly higher amount of heavy metals than the pyromellitate nanosponges, almost double in the case of Cu2+.
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https://www.mdpi.com/2073-4360/11/10/1658/htm
heavy metal adsorption, nanosponge, β-cyclodextrin, linecaps, crosslinked polymers, citric acid polymers
Rubin Pedrazzo, Alberto; Smarra, Alessandra; Caldera, Fabrizio; Musso, Giorgia; Dhakar, Nilesh Kumar; Cecone, Claudio; Hamedi, Asma; Corsi, Ilaria; Trotta, Francesco
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1721027
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