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Selective Removal of Uranyl from Aqueous Solutions Containing a Mix of Toxic Metal Ions Using Core–Shell MFe2O4–TiO2 Nanoparticles of Montmorillonite Edge Sites

  • Liang Bian*
    Liang Bian
    Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, South West University of Science and Technology, Mianyang, 621010 Sichuan, China
    Institute of Gem and Material Technology, Hebei GEO University, Shijiazhuang, 050000 Hebei, China
    *E-mail: [email protected]
    More by Liang Bian
  • Jianan Nie
    Jianan Nie
    Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, South West University of Science and Technology, Mianyang, 621010 Sichuan, China
    More by Jianan Nie
  • Xiaoqiang Jiang
    Xiaoqiang Jiang
    Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, South West University of Science and Technology, Mianyang, 621010 Sichuan, China
  • Mianxin Song*
    Mianxin Song
    Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, South West University of Science and Technology, Mianyang, 621010 Sichuan, China
    *E-mail: [email protected]
    More by Mianxin Song
  • Faqin Dong
    Faqin Dong
    Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, South West University of Science and Technology, Mianyang, 621010 Sichuan, China
    More by Faqin Dong
  • Weimin Li
    Weimin Li
    Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, South West University of Science and Technology, Mianyang, 621010 Sichuan, China
    More by Weimin Li
  • Liping Shang
    Liping Shang
    Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, South West University of Science and Technology, Mianyang, 621010 Sichuan, China
    More by Liping Shang
  • Hu Deng
    Hu Deng
    Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, South West University of Science and Technology, Mianyang, 621010 Sichuan, China
    More by Hu Deng
  • Huichao He
    Huichao He
    Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, South West University of Science and Technology, Mianyang, 621010 Sichuan, China
    More by Huichao He
  • Bing Xu
    Bing Xu
    Sichuan Civil-Military Integration Institute, Mianyang, 621010 Sichuan, China
    More by Bing Xu
  • Bin Wang
    Bin Wang
    Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, South West University of Science and Technology, Mianyang, 621010 Sichuan, China
    More by Bin Wang
  • , and 
  • Xiaobin Gu
    Xiaobin Gu
    Institute of Gem and Material Technology, Hebei GEO University, Shijiazhuang, 050000 Hebei, China
    More by Xiaobin Gu
Cite this: ACS Sustainable Chem. Eng. 2018, 6, 12, 16267–16278
Publication Date (Web):October 23, 2018
https://doi.org/10.1021/acssuschemeng.8b03129
Copyright © 2018 American Chemical Society
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Abstract

Usually, uranyl (UO22+) is competitively adsorbed by coexisting potentially toxic metal ions (Xn+: Rb+, Sr2+, Cr3+, Mn2+, Ni2+, Zn2+, Cd2+) that limit the adsorbent application. Here, the core–shell MFe2O4–TiO2 (M = Mn, Fe, Zn, Co, or Ni) nanoparticles were synthesized on K-montmorillonite (MMT) edge sites and assessed as new selective adsorbents. The results revealed that UO22+ and Xn+ were simultaneously adsorbed on the TiO2(101) surfaces, MFe2O4(111)–TiO2(101)/MMT(100)–MFe2O4(111) interfaces, and MMT inner layers. Specifically, the Xn+ ions were mainly adsorbed on the TiO2(101) surfaces. We note that, according to Freundlich models, UO22+ and Cr3+ were selectively adsorbed on the MFe2O4(111)–TiO2(101) interface. The high adsorption capacity of UO22+ was 109.11 mg g–1 in the MMT–Fe3O4(111)–TiO2(101) interface. The interface electron gases transferred from MMT(100)–MFe2O4(111) to MFe2O4(111)–TiO2(101) prevent the Cr3+ oxidation–reduction reaction and further adsorption. Our results suggested that MMT–MFe2O4–TiO2 is a suitable candidate of highly selective uranyl removal.

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