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Adsorption of uranium from aqueous solution using HDTMA+-pillared bentonite: isotherm, kinetic and thermodynamic aspects

  • You-Qun Wang
  • Zhi-bin Zhang
  • Qin Li
  • Yun-Hai Liu
Article

Abstract

The ability of hexadecyltrimethylammonium cation pillared bentonite (HDTMA+-bentonite) has been explored for the removal and recovery of uranium from aqueous solutions. The adsorbent was characterized using small-angle X-ray diffraction, high resolution transmission electron microscopy, and Fourier transform infrared spectroscopy. The influences of different experimental parameters such as solution pH, initial uranium concentration, contact time, dosage and temperature on adsorption were investigated. The HDTMA+-bentonite exhibited the highest uranium sorption capacity at initial pH of 6.0 and at 80 min. Adsorption kinetics was better described by the pseudo-second-order model and adsorption process could be well defined by the Langmuir isotherm. The thermodynamic parameters, △ (308 K), Δ, and Δ were determined to be −31.64, −83.84 kJ/mol, and −169.49 J/mol/K, respectively, which demonstrated the sorption process of HDTMA+-bentonite towards U(VI) was feasible, spontaneous, and exothermic in nature. The adsorption on HDTMA+-bentonite was more favor than Na-bentonite, in addition the saturated monolayer sorption capacity increased from 65.02 to 106.38 mg/g at 298 K after HDTMA+ pillaring. Complete removal (≈100%) of U(VI) from 1.0 L simulated nuclear industry wastewater containing 10.0 mg U(VI) ions was possible with 1.5 g HDTMA+-bentonite.

Keywords

Hexadecyltrimethylammonium bromide Bentonite Adsorption Uranium 

Notes

Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (Grant No. 21101024), Key Project of Chinese Ministry of Education (Grant No. 211086), Natural Science Foundation of Jiangxi Province (No. 2010GQH0015), Science and Technology project of Jiangxi Provincial Department of Education (No. GJJ11139) and Open Project Foundation of the Key Laboratory of Radioactive Geology and Exploration Technology Fundamental Science for National Defense, East China Institute of Technology, China (2010RGET08).

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2012

Authors and Affiliations

  • You-Qun Wang
    • 2
    • 3
  • Zhi-bin Zhang
    • 1
    • 2
    • 3
  • Qin Li
    • 2
    • 3
  • Yun-Hai Liu
    • 1
    • 2
    • 3
  1. 1.State Key Laboratory Breeding Base of Nuclear Resources and Environment (East China Institute of Technology)Ministry of EducationNanchangPeople’s Republic of China
  2. 2.Key Laboratory of Radioactive Geology and Exploration Technology Fundamental Science for National DefenseEast China Institute of TechnologyFuzhouPeople’s Republic of China
  3. 3.Department of Chemistry, Biological and Materials SciencesEast China Institute of TechnologyFuzhouPeople’s Republic of China

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