Magnetic
Fe/Zn layered double oxide decorated carbon nanotubes
(M-Fe/Zn-LDO@CNTs) composites were synthesized via a hydrothermal
method with further calcination treatment. The fabricated M-Fe/Zn-LDO@CNTs
were characterized by X-ray photoelectron spectroscopy, Fourier transform
infrared spectroscopy, X-ray diffraction, UV–vis spectroscopy,
scanning electron microscopy, and transmission electron microscopy
and then applied for U(VI) elimination under diversiform experimental
conditions, such as pH, temperature, ionic strength, contact time,
and coexisting ions. The experimental results demonstrated that the
U(VI) adsorption performance of M-Fe/Zn-LDO@CNTs was much higher than
bare CNTs. The thermodynamic parameters revealed that U(VI) adsorption
on M-Fe/Zn-LDO@CNTs was endothermic and spontaneous. More importantly,
the adsorption performance of U(VI) on M-Fe/Zn-LDO@CNTs was still
higher than ∼89% after five cycles. Furthermore, ∼95.9%
of 241Am(III) could be removed by M-Fe/Zn-LDO@CNTs from
solution at pH = 8.0, which confirmed that M-Fe/Zn-LDO@CNTs was an
excellent material for efficient removal of long-lived lanthanides
and actinides from environmental aqueous solutions in radionuclides’
pollution remediation.