In this study, silylated Laponites (LAP) were synthetized with various loads of 3-aminopropyltriethoxysilane (APTES) to evaluate their adsorption properties of Cs, Co, and Sr during single-solute and competitive experiments. The increase in the initial load of APTES increased the adsorbed amount of APTES in the resulted grafted clay. The characterization of LAP-APTES exhibited a covalent binding between APTES and LAP and emphasized the adsorption sites of APTES for each tested load. In comparison with raw LAP, LAP-APTES displayed significantly higher adsorption properties of Co, Cs, and Sr. The competitive adsorption of these three contaminants provides a deeper understanding of the affinity between adsorbate and adsorbent. Therefore, Co displayed a strong and specific adsorption onto LAP-APTES. Except for Cs, the adsorption capacity was improved with increasing the load of APTES. Finally, the desorption behavior of the three contaminants was tested in saline solutions. Cs and Sr were significantly released especially by inorganic cations displaying the same valence. Conversely, desorption of Co was very low whatever the saline solution. LAP-APTES, therefore, presented suitable adsorption properties for the removal of radionuclides especially for Co, making this material suitable to improve the decontamination of radioactive wastewaters.
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| http://dx.doi.org/10.3390/ma13030572 | DOI Listing |
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