In this work, we prepared two-dimensional (2D) stack-structured aminopropylIsobutyl polyhedral oligomeric silsesquioxane (POSS-NH) intercalated titanium carbide (TiCT) MXene material (TiCT/POSS-NH) using a post-intercalation strategy as a potential adsorbent for the removal of cesium (Cs) and strontium (Sr) ions from aqueous solutions. TiCT/POSS-NH exhibited unprecedented adsorption capacities of 148 and 172 mg g for Cs and Sr ions, respectively. Batch adsorption experimental data well fitted the Freundlich isotherm model, which revealed multilayer adsorption of Cs and Sr ions onto heterogeneous -OH, -F, -O, and -NH adsorption sites of TiCT/POSS-NH with different energies. TiCT/POSS-NH exhibited rapid Cs/Sr ions adsorption kinetics and attained equilibrium within 30 min. Also, TiCT/POSS-NH exhibited recyclable capability over three cycles and remarkable selectivities of 89% and 93% for Cs and Sr ions, respectively, in the presence of co-existing mono- and divalent cations. We suggest the high adsorption capacity of TiCT/POSS-NH might be due to the synergistic effects of (i) increased inter-lamellar distance between TiCT galleries due to POSS-NH intercalation, enabling diffusion and encapsulation of large numbers of Cs/Sr ions, (ii) strong complexation of amine (-NH) groups of POSS-NH with Cs/Sr ions, and (iii) the presence of large numbers of heterogeneous surface functional groups (e.g., -OH, -F, and -O), which resulted in the adsorptions of Cs/Sr ions through electrostatic, ion exchange, and surface complexation mechanisms. Given the extraordinary adsorption capacities observed, intercalation appears to be a promising strategy for the effective removal of radioactive Cs and Sr ions from aqueous media.
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