title: Different Interaction Mechanisms of Eu(III) and (243)Am(III) with Carbon Nanotubes Studied by Batch, Spectroscopy Technique and Theoretical Calculation.
abstract: Herein the sorption of Eu(III) and (243)Am(III) on multiwalled carbon nanotubes (CNTs) are studied, and the results show that Eu(III) and (243)Am(III) could form strong inner-sphere surface complexes on CNT surfaces. However, the sorption of Eu(III) on CNTs is stronger than that of (243)Am(III) on CNTs, suggesting the difference in the interaction mechanisms or properties of Eu(III) and (243)Am(III) with CNTs, which is quite different from the results of Eu(III) and (243)Am(III) interaction on natural clay minerals and oxides. On the basis of the results of density functional theory calculations, the binding energies of Eu(III) on CNTs are much higher than those of (243)Am(III) on CNTs, indicating that Eu(III) could form stronger complexes with the oxygen-containing functional groups of CNTs than (243)Am(III), which is in good agreement with the experimental results of higher sorption capacity of CNTs for Eu(III). The oxygen-containing functional groups contribute significantly to the uptake of Eu(III) and (243)Am(III), and the binding affinity increases in the order of ≡S-OH < ≡S-COOH < ≡S-COO(-). This paper highlights the interaction mechanism of Eu(III) and (243)Am(III) with different oxygen-containing functional groups of CNTs, which plays an important role for the potential application of CNTs in the preconcentration, removal, and separation of trivalent lanthanides and actinides in environmental pollution cleanup.
authors.affiliation: School of Environment and Chemical Engineering, North China Electric Power University , Beijing 102206, P. R. China.|Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions , Suzhou, 215123, P. R. China.
authors.forename: Xiangxue
authors.initials: X
authors.lastname: Wang
authors.affiliation: School of Environment and Chemical Engineering, North China Electric Power University , Beijing 102206, P. R. China.|Key Laboratory of Novel Thin Film Solar Cells, Institute of Plasma Physics, Chinese Academy of Sciences , P.O. Box 1126, Hefei, 230031, P. R. China.
authors.forename: Shubin
authors.initials: S
authors.lastname: Yang
authors.affiliation: Institute of High Energy Physics, Chinese Academy of Sciences , 100049, Beijing, P. R. China.
authors.forename: Weiqun
authors.initials: W
authors.lastname: Shi
authors.affiliation: School of Environment and Chemical Engineering, North China Electric Power University , Beijing 102206, P. R. China.|Key Laboratory of Novel Thin Film Solar Cells, Institute of Plasma Physics, Chinese Academy of Sciences , P.O. Box 1126, Hefei, 230031, P. R. China.
authors.forename: Jiaxing
authors.initials: J
authors.lastname: Li
authors.affiliation: NAAM Research Group, Faculty of Science, King Abdulaziz University , Jeddah 21589, Saudi Arabia.
authors.forename: Tasawar
authors.initials: T
authors.lastname: Hayat
authors.affiliation: School of Environment and Chemical Engineering, North China Electric Power University , Beijing 102206, P. R. China.|NAAM Research Group, Faculty of Science, King Abdulaziz University , Jeddah 21589, Saudi Arabia.
authors.forename: Xiangke
authors.initials: X
authors.lastname: Wang
mesh_terms: D000576:Americium / Q000737:chemistry*; D005063:Europium / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008962:Models, Theoretical; D037742:Nanotubes, Carbon / Q000737:chemistry*; D011789:Quantum Theory; D013050:Spectrometry, Fluorescence; D013696:Temperature; D013816:Thermodynamics
chemical_list: D037742:Nanotubes, Carbon; D005063:Europium; D000576:Americium