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Removal of soluble uranium by illite supported nanoscale zero-valent iron: electron transfer processes and incorporation mechanisms

  • Chen JingEmail author
  • Quan Li
  • Zhi Tang
  • Jiali Xu
  • Yilian LiEmail author
Article
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Abstract

In this study, natural illite is introduced to support nanoscale zero valent iron (NZVI). The chemical composition and the physical properties of illite supported nanoscale zero valent iron (I-NZVI) are systematically investigated, and I-NZVI is found to significantly reduce the agglomeration of the NZVI particles. A comparison of the U removal capacity between I-NZVI and NZVI over various reaction times is then conducted. With an initial concentration of U at 200 μg/L, the I-NZVI removal capacity of U is as high as 3.41 mg U/g Fe, in contrast to 2.01 mg U/g Fe by NZVI at a dosage of 0.1 g/L. The initial pH of the reaction system determines the U removal capacity of I-NZVI, since it controls the speciation of U and the electron transfer processes during the reaction. Overall, based on the comprehensive understandings of the morphological change, variations in the crystalline structure, and the valence states of U and Fe, the removal mechanisms of U by I-NZVI can be concluded as the following processes: (1) the adsorption and incorporation of U(VI) onto the surface of I-NZVI, (2) the incorporation and reduction of U(V) into Fe(II), and (3) the reduction and precipitation of U(IV) with iron.

Graphic abstract

Keywords

Uranium removal Supported NZVI Morphological evolution Electron transfer Incorporation mechanism 

Notes

Acknowledgements

This work was supported by the China Postdoctoral Science Foundation (No. 2018M642953). The authors would like to acknowledge Dr. B. H. Song from Oak Ridge National Laboratory (USA) for the help on XPS analysis. Authors also thank Dr. Z. Y. Li from the University of Texas at Austin (USA) for the help on polishing language .

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  1. 1.School of Environmental StudiesChina University of GeosciencesWuhanChina

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