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The hierarchical core-shell and yolk-shell magnetic titanate nanosheets (FeO@TNS) were successfully synthesized by employing magnetic nanoparticles (NPs) as interior core and intercrossed titanate nanostructures (NSs) as exterior shell. The as-prepared magnetic FeO@TNS nanosheets had high specific areas (114.9 m g for core-shell FeO@TNS and 130.1 m g for yolk-shell FeO@TNS). Taking advantage of the unique multilayer structure, the nanosheets were suitable for eliminating U(VI) from polluted water environment. The sorption was strongly affected by pH values and weakly influenced by ionic strength, suggesting that the sorption of U(VI) on FeO@TNS was mainly dominated by ion exchange and outer-sphere surface complexion. The maximum sorption capacities (Q) calculated from the Langmuir model were 68.59, 121.36 and 264.55 mg g for core-shell FeO@TNS and 82.85, 173.01 and 283.29 mg g for yolk-shell FeO@TNS, at 298 K, 313 K and 328 K, respectively. Thermodynamic parameters (ΔH, ΔS and ΔG) demonstrated that the sorption process was endothermic and spontaneous. Based on X-ray photoelectron spectroscopy (XPS) analyses, the sorption mechanism was confirmed to be cation-exchange between interlayered Na and UO. The yolk-shell FeO@TNS had more extraordinary sorption efficiency than core-shell FeO@TNS since the yolk-shell structure provided internal void space inside the titanate shell to accommodate more exchangeable active sites. The flexible recollection and high efficient sorption capacity made core-shell and yolk-shell FeO@TNS nanosheets promising materials to eliminate U(VI) or other actinides in wastewater cleanup applications.
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| http://dx.doi.org/10.1016/j.envpol.2018.03.092 | DOI Listing |
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