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Kinetics and mechanism of Sr(II) adsorption by Al-Fe2O3: Evidence from XPS analysis.
- Source :
-
Journal of Molecular Liquids . May2017, Vol. 233, p364-369. 6p. - Publication Year :
- 2017
-
Abstract
- The Al-Fe 2 O 3 with different aluminum contents were synthesized by heating Al-substituted goethite and were characterized by FESEM, XRD, FT-IR and XPS techniques. The characteristic results showed that the Fe 3 + ion in hematite was partly substituted by Al 3 + ion, leading to the change of crystal structure. The batch experiments indicated that the adsorptions of Sr(II) on Al-Fe 2 O 3 slowly increased with increasing pH starting from 2 to 11. The pseudo-second-order kinetic and the Langmuir model gave the better fits to the adsorption kinetics and isotherms, respectively. The thermodynamic parameters indicated that the adsorption of Sr(II) on Fe 2 O 3 was an endothermic and spontaneous process. The XPS analysis demonstrated that the oxygen-containing functional groups were responsible for the Sr(II) adsorption. These findings indicated that Al-Fe 2 O 3 may be a valuable candidate for pre-concentration and solidification of radionuclides from aqueous solutions. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 01677322
- Volume :
- 233
- Database :
- Academic Search Index
- Journal :
- Journal of Molecular Liquids
- Publication Type :
- Academic Journal
- Accession number :
- 122435680
- Full Text :
- https://doi.org/10.1016/j.molliq.2017.03.045