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Adsorption of uranium ions on nano-hydroxyapatite and modified by Ca and Ag ions

Authors
  • Skwarek, E.1
  • Gładysz-Płaska, A.1
  • Choromańska, J. B.2
  • Broda, E.1
  • 1 Maria Curie-Sklodowska University, Faculty of Chemistry, M. Curie-Sklodowska Sq. 3, Lublin, 20-031, Poland , Lublin (Poland)
  • 2 Medical University of Warsaw, Department of Rehabilitation, S. Banacha str.1a, Warsaw, 02-097, Poland , Warsaw (Poland)
Type
Published Article
Journal
Adsorption
Publisher
Springer US
Publication Date
Mar 27, 2019
Volume
25
Issue
3
Pages
639–647
Identifiers
DOI: 10.1007/s10450-019-00063-z
Source
Springer Nature
Keywords
License
Green

Abstract

Adsorption of uranium ions on nano-hydroxyapatite modified by silver (Ag-HAP) and calcium (Ca-HAP) ions was examined. Composites or studied adsorbents were studied by means of XRD, ASAP and DLS molecules sizes. The Langmuir, Freundlich, and Dubinin-Radushkevich models were applied to describe the adsorption isotherms. The maximum adsorption capacity (qm) was found to be 8.1 mmol/g for Ca-HAP and 7.2 mmol/g for Ag-HAP at 293 K. The mean free energy values evaluated from the D-R model indicated that the adsorption of U(VI) ions on the adsorbents proceeds as the chemisorption mechanism. The adsorption equilibrium was reached for both sorbents after 120 min. The adsorption kinetics followed the pseudo-second-order model. There were determined basic parameters characterizing the double electrical layer at the nano-HAP/electrolyte and Ag-HAP/electrolyte, Ca-HAP/electrolyte inters faces: density of the surface charge and zeta potential.

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