Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 347, Issue -, Pages 67-77Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2017.12.062
Keywords
Ca/Al-LDH@CNTs composites; U(VI)Am-241(III); Adsorption; Interaction mechanism
Categories
Funding
- Science Challenge Project [TZ2016004]
- China Postdoctoral Science Foundation [2016M600981]
- National Natural Science Foundation of China [21577032, 21561002, 11475044, 41461070]
- Jiangsu Provincial Key Laboratory of Radiation Medicine and Protection
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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Ca/Al layered double hydroxide decorated carbon nanotube (Ca/Al-LDH@CNTs) composites were fabricated by co-precipitation method and hydrothermal aged treatment. The prepared Ca/Al-LDH@CNTs was characterized by SEM, TEM, EDS, XRD, FT-IR, UV-vis and XPS techniques, and applied to remove U(VI) from aqueous solutions under various environmental conditions (i.e., pH, ionic strength, temperature and contact time). The results indicated that the adsorption of U(VI) on Ca/Al-LDH@CNTs was four times higher than that of U(VI) on bare CNTs. The kinetic investigations reflected the chemisorption of U(VI) on Ca/Al-LDH@CNTs through oxygen-containing functional groups. The adsorption isotherms demonstrated that the adsorption of U(VI) was well fitted by Langmuir model and the maximum adsorption capacity of U(VI) on Ca/Al-LDH@CNTs was calculated to be 382.9 mg g(-1) at 289.15 K. The thermodynamic parameters calculated from temperature-dependent isotherms suggested that U(VI) adsorption on Ca/Al-LDH@CNTs were endothermic and spontaneous process. Furthermore, Ca/Al-LDH@CNTs could remove similar to 91% of Am-241(III) at pH = 8.0, which confirmed Ca/Al-LDH@CNTs as a promising material for multiply low level radionuclides' pollution remediation. (C) 2017 Elsevier B.V. All rights reserved.
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