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Water, Air, & Soil Pollution

, 229:338 | Cite as

Chemical Behavior of U(VI) in the Presence of Soil Components

  • M. Jiménez-Reyes
  • M. Solache-Ríos
Article
  • 109 Downloads

Abstract

Soil components from different environments (forest (OF), semiarid (SZ), and sand (AS)) were separated from fulvic and humic substances, characterized by DRX, EDS(SEM), and zero-charge points were determined. The sorption of U(VI) by these materials was determined considering contact time, concentration of U(VI), pH, ionic strength, and presence of sodium chloride and humic acids. The time to reach the kinetic sorption equilibrium was ca. 1 min for the components of the SZ and AS soils, whereas those from OF required longer times. The zero-charge points of the materials indicate that in the experimental conditions, the surfaces of the materials are positively charged, as are uranyl ions. The sorption kinetic data were well fitted to the pseudo-second-order model, which indicates chemical sorption. The maximum sorption capacities for U(VI) obtained from data fitted to the Langmuir model of OF and SZ were 49 and 19.8 mg g−1 respectively. Sorption isotherm data for AS were best fitted to the Freundlich model (qe = 5.4 mg g−1). The maximum values of distribution coefficients (Kd) were 23 ± 7 L kg−1, 545 ± 64 L kg−1, and 1178 ± 229 L kg−1 for AS, SZ, and OF, respectively; these values may depend on pH, contact time, initial concentration of U(VI), and the composition of the materials. Sodium chloride in the aqueous solutions affects U(VI) sorption by the materials SZ and AS. The effect of humic acids depends on pH, only in acid media soluble humate complexes may be formed.

Keywords

Uranium(VI) Soils Sorption Inorganic components of soils, models 

Notes

Acknowledgements

We acknowledge donation of the samples to F. Monroy-Guzmán and E. Fernández-Ramírez (semiarid zone soil), T.J. Zamudio-Zamudio (Alvarado sand), and N. Zárate-Montoya (high purity water). The technical support of E. Morales Moreno, M. Villa Tomasa and I. Z. López Malpica was much appreciated.

Compliance with Ethical Standards

Conflict of Interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer Nature Switzerland AG 2018

Authors and Affiliations

  1. 1.Departamento de QuímicaInstituto Nacional de Investigaciones NuclearesLa Marquesa, OcoyoacacMexico

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