1. Eco-Friendly β-cyclodextrin and Linecaps Polymers for the Removal of Heavy Metals
- Author
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Asma Hamedi, Nilesh Kumar Dhakar, Alessandra Smarra, Ilaria Corsi, Fabrizio Caldera, Claudio Cecone, Giorgia Musso, Francesco Trotta, and Alberto Rubin Pedrazzo
- Subjects
Pyromellitic dianhydride ,Polymers and Plastics ,Starch ,Sodium ,chemistry.chemical_element ,02 engineering and technology ,macromolecular substances ,010501 environmental sciences ,01 natural sciences ,complex mixtures ,Article ,linecaps ,Metal ,lcsh:QD241-441 ,chemistry.chemical_compound ,Adsorption ,citric acid polymers ,lcsh:Organic chemistry ,heavy metal adsorption ,ß-cyclodextrin ,0105 earth and related environmental sciences ,chemistry.chemical_classification ,crosslinked polymers ,Cyclodextrin ,Dimethyl sulfoxide ,technology, industry, and agriculture ,General Chemistry ,021001 nanoscience & nanotechnology ,equipment and supplies ,chemistry ,heavy metal adsorption, nanosponge, β-cyclodextrin, linecaps, crosslinked polymers, citric acid polymers ,Citric acid polymers ,Crosslinked polymers ,Heavy metal adsorption ,Linecaps ,Nanosponge ,β-cyclodextrin ,visual_art ,visual_art.visual_art_medium ,bacteria ,0210 nano-technology ,Citric acid ,Nuclear chemistry ,nanosponge - Abstract
Environment-friendly nanosponges, having a high content of carboxyl groups, were synthesized by crosslinking &beta, cyclodextrin and linecaps, a highly soluble pea starch derivative, with citric acid in water. Additionally, pyromellitic nanosponges were prepared by reacting &beta, 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 (&le, 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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