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  | ARTICLE  | Am. J. innov. res. appl. sci. Volume 12,  Issue 6, Pages 231-243 (June, 2021)
   Research Article 1
 
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| JUNE | VOLUME 12 | N° 6 | 2021 |
| Info-AJIRAS-® Journal ISSN 2429-5396 (Online) / Reference  CIF/15/0289M |
  American Journal of Innovative Research & Applied Sciences
|
American Journal of innovative
Research & Applied Sciences 
ISSN  2429-5396 (Online)
OCLC Number: 920041286
ABSTRACT

Background: Sorption processes control the mobility, biodisponibility, bio-transformation, speciation and ultimately the toxicity of metals and metalloids in the subsurface. Methods: This paper analyses the electronic and geometric structure of solid samples of uranium onto scrap metallic iron and the versatile bacterium Shewanella putrefaciens surfaces in the presence of arsenic by means of U L3 and As K- edge extended X-ray absorption fine structure (EXAFS) measurements prepared by batch sorption experiments. Results: This analysis complements a companion XANES fingerprinting investigation both aiming at uncovering the underlying major mechanism controlling the state of the uranium atoms. The sorption experiment samples comprise of the systems Fe(0)-0.1 mM U, Fe(0)-0.1 mM U-0.1 mM As and the anoxic Fe(0)-0.1 mM U-0.1 mM As-DSMZ Shewanella putrefaciens strain 6067 at concentration of two optical density units (600 nm) equilibrated for 24 hours in the dark without shaking. EXAFS spectra evaluation confirms the presence and prevalence of respectively U(VI)-O/O-OH axial and equatorial bonds in the mono-component uranium system and both U(VI)-O/O-OH and tetrahedron As(V)-(O,OH) in the bi-components uranium-arsenic systems sorbed onto scrap metallic iron and Shewanella putrefaciens surfaces. Conclusion: The absence of peaks beyond the major axial and equatorial U(VI)-O/O-OH bonds in the mono-component uranium system and the concurrent occurrence of U(VI)-O/O-OH and As(V)-(O,OH) bonds in the bi-component uranium-arsenic systems suggest the likely plausibility of precipitation/co-preciptation mechanism as the leading control of uranium behavior.

Keywords: sorption, uranium, arsenic, XAFS, modeling, iron, bacteria.
Authors Contact

*Correspondant author and authors Copyright © 2021:

| Marouane Ikira|


Affiliation.

Université HASSAN II | Laboratoire Econométrie Appliquée | Casablanca | Maroc |


This article is made freely available as part of this journal's Open Access: ID | Ikira-Ref31-ajira160521  |
INVESTIGATING THE MECHANISMS OF U(VI) SORPTION ONTO FE(0) AND SHEWANELLA PUTREFACIENS SURFACES IN THE PRESENCE OF AS(V) USING EXTENDED X-RAY ABSORPTION FINE STRUCTURE SPECTROSCOPY 


   | Clement Nzau Umba-di-Mbudi 1* |. Am. J. innov. res. appl. sci. 2021; 12(6):231-243.

  | PDF FULL TEXT | | XML FILE |    | Received | May 19, 2021 | | Accepted | May  26, 2021 |  | Published |  June 01, 2021 |

*Corresponding author Author & Copyright Author © 2021: | Clement N’zau Umba-di-Mbudi *|. All Rights Reserved. All articles published in American Journal of Innovative
Research and Applied Sciences are the property of Atlantic Center Research Sciences, and is protected by copyright laws CC-BY. See: http://creativecommons.org/licenses/by-nc/4.0/.