1. Eco-Friendly β-cyclodextrin and Linecaps Polymers for the Removal of Heavy Metals
- Author
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Alberto Rubin Pedrazzo, Alessandra Smarra, Fabrizio Caldera, Giorgia Musso, Nilesh Kumar Dhakar, Claudio Cecone, Asma Hamedi, Ilaria Corsi, and Francesco Trotta
- Subjects
heavy metal adsorption ,nanosponge ,β-cyclodextrin ,linecaps ,crosslinked polymers ,citric acid polymers ,Organic chemistry ,QD241-441 - 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+.
- Published
- 2019
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