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Issue 71, 2014
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Highly efficient removal of 137Cs in seawater by potassium titanium ferrocyanide functionalized magnetic microspheres with multilayer core–shell structure

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Abstract

In this study, a novel kind of core–shell-structured magnetic microsphere functionalized with potassium titanium ferrocyanide (KTiFC) was developed for the highly efficient removal of radioactive cesium from seawater. During the synthesis, a compact silica protective interlayer was deliberately constructed to stabilize the nano-sized magnetite cores, while preventing erosion under harsh environmental conditions. Because of high ion exchange capacity of the KTiFC functional layer, the magnetic microspheres exhibited high removal efficiency (≥97.7%) of radiocesium from 137Cs-spiked solutions (3000–35 000 Bq L−1) and contaminated seawater. Batch experiments revealed that adsorption equilibrium was rapidly achieved within 30 min and the maximum adsorption capacity was up to 43.09 mg g−1. Kinetic models and Langmuir/Freundlich adsorption isotherm equations were used to fit the experiment data for describing the adsorption process. Because of the favorable magnetic property, a facile separation and reclamation of the magnetic microspheres from aqueous solution was achieved under an external magnetic field. Moreover, from a practical viewpoint, the magnetic microspheres were proven to have good re-dispersion properties and long-term stability against strong HNO3 solutions (1.0 mol L−1). These magnetic microspheres are believed to hold great promise for the clean-up of radiocesium contaminated water around nuclear facilities and/or after nuclear accidents.

Graphical abstract: Highly efficient removal of 137Cs in seawater by potassium titanium ferrocyanide functionalized magnetic microspheres with multilayer core–shell structure

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Publication details

The article was received on 06 Jun 2014, accepted on 04 Aug 2014 and first published on 04 Aug 2014


Article type: Paper
DOI: 10.1039/C4RA05397D
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RSC Adv., 2014,4, 37600-37608

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    Highly efficient removal of 137Cs in seawater by potassium titanium ferrocyanide functionalized magnetic microspheres with multilayer core–shell structure

    R. Yi, G. Ye, F. Wu, M. Wen, X. Feng and J. Chen, RSC Adv., 2014, 4, 37600
    DOI: 10.1039/C4RA05397D

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