期刊
POLYMERS
卷 11, 期 10, 页码 -出版社
MDPI
DOI: 10.3390/polym11101658
关键词
heavy metal adsorption; nanosponge; beta-cyclodextrin; linecaps; crosslinked polymers; citric acid polymers
资金
- Tuscany POR FESR 2014-2020
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 (<= 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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