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. 2019 May 2;9(5):682. doi: 10.3390/nano9050682

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Mechanism of ¹³⁷Cs⁺ capture in graphene/CNT/PB nanocomposite. Fe₃O₄ is used for magnetic extraction and does not participate in the adsorption of ¹³⁷Cs⁺. PB is linked to CNT and graphene. Some of the possible functional groups that capture ¹³⁷Cs⁺ are depicted on the CNT and graphene surfaces. A sub-cube or unit-cell of PB capturing and sequestering the ¹³⁷Cs atom is also provided in the top right corner. The nanocomposite therefore harbors several active sites for the capture of ¹³⁷Cs⁺ ions.