Published April 15, 2019 | Version v1
Journal article Metadata-only

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

Creators

  • 1. Maria Curie-Sklodowska University, Faculty of Chemistry (Poland)
  • 2. Medical University of Warsaw, Department of Rehabilitation (Poland)

Description

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.

Additional details

Identifiers

DOI
10.1007/s10450-019-00063-z;

Publishing Information

Journal Title
Adsorption (Boston)
Journal Volume
25
Journal Issue
3
Journal Page Range
p. 639-647
ISSN
0929-5607

Conference

Title
10. international symposium on effects of surface heterogeneity in adsorption, catalysis and related phenomena
Acronym
ISSHAC-10
Dates
27-31 Aug 2018
Place
Lublin (Poland)

INIS

Country of Publication
Netherlands
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
54073702
Subject category
S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; S07: ISOTOPES AND RADIATION SOURCES;
Resource subtype / Literary indicator
Conference
Descriptors DEI
ADSORBENTS; ADSORPTION; ADSORPTION ISOTHERMS; APATITES; CALCIUM; CHEMISORPTION; ELECTROLYTES; FREE ENERGY; KINETICS; LAYERS; MOLECULES; SILVER; SILVER IONS; SURFACES; URANIUM IONS; X-RAY DIFFRACTION
Descriptors DEC
ALKALINE EARTH METALS; CHARGED PARTICLES; CHEMICAL REACTIONS; COHERENT SCATTERING; DIFFRACTION; ELEMENTS; ENERGY; IONS; ISOTHERMS; METALS; MINERALS; PHOSPHATE MINERALS; PHYSICAL PROPERTIES; SCATTERING; SEPARATION PROCESSES; SORPTION; THERMODYNAMIC PROPERTIES; TRANSITION ELEMENTS

Optional Information

Copyright
Copyright (c) 2019 The Author(s)