XAFS spectroscopy study of Eu(III) sorption on γ-Alumina: effect of pH

Sumit Kumar; Aishwarya Kar; D. Bhattacharyya; B. Tomar

doi:10.1007/s10967-011-1543-7

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Journal of Radioanalytical and Nuclear Chemistry

Volume/Issue:: Volume 294: Issue 1

XAFS spectroscopy study of Eu(III) sorption on γ-Alumina: effect of pH

Authors:

Sumit Kumar

Sumit Kumar Radioanalytical Chemistry Division, Bhabha Atomic Research Centre, Mumbai, 400085 India

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Aishwarya Kar

Aishwarya Kar Radioanalytical Chemistry Division, Bhabha Atomic Research Centre, Mumbai, 400085 India

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D. Bhattacharyya

D. Bhattacharyya Applied Spectroscopy Division, Bhabha Atomic Research Centre, Mumbai, 400085 India

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, and

B. Tomar

B. Tomar Radioanalytical Chemistry Division, Bhabha Atomic Research Centre, Mumbai, 400085 India

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Pages:: 109–113

Online Publication Date:: 16 Nov 2011

Publication Date:: 01 Oct 2012

Article Category:: Research Article

DOI:: https://doi.org/10.1007/s10967-011-1543-7

Keywords:: Eu(III); γ-Alumina; EXAFS; XANES; Sorption

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Abstract

L_III edge X-ray Absorption Fine Structure (XAFS) spectroscopic study of Eu(III) sorbed on γ-alumina from aqueous solutions of different pH (values ranging from 6 to 8) has been carried out at XAFS beam line of Elettra Synchrotron facility, Italy, in transmission mode. Extended X-ray Absorption Fine Structure spectra of reference compounds, namely, Eu₂O₃, Eu(OH)₃ and Eu-aquo complex in solution, were also measured. The data were analyzed using the IFEFFIT suite of code. XAFS spectra of the sorption samples is dominated by the Eu–O near neighbor co-ordination at distance 2.4 ± 0.1 Å. 8–9 oxygen atoms, coming from both coordinating water molecule and oxygen atoms from alumina surface, surround the Eu(III) in the surface complex. Next near neighbor atoms in all the sorption samples consist of Al at distance ~3.6 and 3.8 Å, which on comparison with literature data indicates towards Eu(III) bidentate binding to apical oxygen of two different alumina octahedra on γ-alumina surface.

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Journal of Radioanalytical and Nuclear Chemistry

Print ISSN:: 0236-5731

Online ISSN:: 1588-2780

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Journal of Radionalytical and Nuclear Chemistry
Language	English
Size	A4
Year of Foundation	1968
Volumes per Year	1
Issues per Year	12
Founder	Akadémiai Kiadó
Founder's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher	Akadémiai Kiadó Springer Nature Switzerland AG
Publisher's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible Publisher	Chief Executive Officer, Akadémiai Kiadó
ISSN	0236-5731 (Print)
ISSN	1588-2780 (Online)