Abstract
Dried duckweed (Landoltia punctata) powder is applied to remove IO3− from aqueous solutions under various conditions. The results indicate the Kd is 150 ml g−1 under general conditions. The sorption kinetics follow the pseudo-second-order equation, and the isotherm is well described by the Freundlich model. Hydroxyl and carbonyl groups contribute to IO3− sorption by ion-exchange, electrostatic attraction and redox reactions. Spectroscopic analyses prove that IO3− is reduced to I2 and I− by hydroxyl groups. These results demonstrate that duckweed (Landoltia punctata) is a promising biosorbent for environmental remediation of radioactive iodine pollution.
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Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (Grant No. 11305061) and the Special Fund for Geological Disposal of High-level Radioactive Waste (Grant Nos. 2012-851).
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Zhang, K., Chen, T. Sorption and removal of iodate from aqueous solution using dried duckweed (Landoltia punctata) powder. J Radioanal Nucl Chem 316, 543–551 (2018). https://doi.org/10.1007/s10967-018-5807-3
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DOI: https://doi.org/10.1007/s10967-018-5807-3