Abstract
In this article, a new class of silica gel adsorbent functionalized with macrocyclic receptors was developed for cesium recognition. A calixcrown molecule, with strong affinity to cesium cation, was decorated precisely at the 1,3-alternate benzene rings with reactive amino substituents, followed by the anchoring to the silica matrix to obtain a high functionalization degree. Structural characterization of the monomers and the organosilicas was carried out by 1H/13C NMR, 29Si/13C solid-state NMR, and FT-IR spectra. Besides, XPS survey, BET, TGA and ESEM were employed to investigate the surface property, thermal stability and micro-morphology of the organosilicas. Due to the host–guest interaction between the calixcrown receptor and cesium cation, efficient separation of cesium in the presence of competing alkali metals including sodium and potassium was realized. Mechanism regarding the recognition effect was discussed. The calixcrown-grafted organosilica material possesses the potential to be applied for the separation of cesium in radioactive liquid waste.
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The financial support from the NSFC under Project 51103079 and 91226110 is gratefully acknowledged.
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Leng, Y., Ye, G., Xu, J. et al. Synthesis of new silica gel adsorbent anchored with macrocyclic receptors for specific recognition of cesium cation. J Sol-Gel Sci Technol 66, 413–421 (2013). https://doi.org/10.1007/s10971-013-3025-6
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DOI: https://doi.org/10.1007/s10971-013-3025-6