☆ 4.7 Article

Efficient removal of uranium(VI) by layered double hydroxides supported nanoscale zero-valent iron: A combined experimental and spectroscopic studies

CHEMICAL ENGINEERING JOURNAL (2019)

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期刊

CHEMICAL ENGINEERING JOURNAL
卷 365, 期 -, 页码 51-59

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ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.02.024

关键词

LDH; Zero-valent iron; Uranium; Adsorption; Environmental remediation

类别

Engineering, Environmental Engineering, Chemical

资金

  1. Science Challenge Project [TZ2016004]
  2. Natural Science Foundation of China [21876048, 21836001, 21607042]
  3. Fundamental Research Funds for the Central Universities [2018ZD11, 2018MS114]
  4. Research Fund Program of Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources [GZDX2017K001]

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In this study, nanoscale zero-valent iron (nZVI) supported on layered double hydroxide (LDH) composite (LDH@nZVI) was prepared, characterized and applied to U(VI) scavenging in water. Removal of U(VI) as a function of pH, ionic strength, reaction time, initial concentrations of U(VI), and temperature were studied and compared with pure LDH and nZVI, the LDH@nZVI had best U(VI) removal efficiency owning to the excellent synergistic combination of LDH adsorption and nZVI reduction. XPS analysis found that surface oxygen functional groups and surface-bound Fe(II) played a critical role in U(VI) remediation. The large surface areas (334.0 m(2)/g), abundant functional groups (i.e., M-O, C-O and -OH), rapid kinetics (adsorption equilibrium within 1 h) and excellent adsorption capacities (176 mg/g) indicating that LDH@nZVI can be considered as a potential material for preconcentration of U(VI) from sewage water.

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