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Characteristics and mechanism of uranium photocatalytic removal enhanced by chelating hole scavenger citric acid in a TiO2 suspension system

  • Mingxue Liu
  • Lang Luo
  • Faqin Dong
  • Hongfu Wei
  • Xiaoqin Nie
  • Wei Zhang
  • Wenyuan Hu
  • Congcong Ding
  • Pingping Wang
Article

Abstract

Polycarboxylic acid acts as hole scavenger and chelating agent, which is essential for the photocatalytic removal of multivalent metal ions. The photocatalytic uranium removal, role of chelating hole scavenger citric acid (CA), and removal mechanism were investigated in a TiO2 suspension system. The results show that chelating agent CA is an efficient hole scavenger. The maximum removal efficiency of U(VI) reaches up to 98.6%. The uranium-bearing precipitates contains Na[(UO2)(Cit)], UO2, or UO4·2H2O. The mechanisms for the photocatalytic removal of U(VI) and the role of CA are discussed. These results suggest that proper chelating hole scavengers can promote and regulate the photocatalytic removal of multivalent metal ions.

Keywords

Photocatalytic removal Uranium Citric acid Chelating hole scavenger Mechanism 

Notes

Acknowledgements

The authors thank the National Basic Research Program of China (973 Program: 2014CB846003), National Key R&D Program of China (2016YFC0502204), National Nature Science Foundation of China (Grant numbers: 41272371, 41502316), and Longshan Academic Talent Research Supporting Program of SWUST (18LZX507).

Supplementary material

10967_2018_6237_MOESM1_ESM.doc (866 kb)
Supplementary material 1 (DOC 865 kb)
10967_2018_6237_MOESM2_ESM.doc (86 kb)
Supplementary material 2 (DOC 86 kb)
10967_2018_6237_MOESM3_ESM.doc (47 kb)
Supplementary material 3 (DOC 47 kb)

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2018

Authors and Affiliations

  1. 1.Life Science and Engineering CollegeSouthwest University of Science and TechnologyMianyangPeople’s Republic of China
  2. 2.Key Laboratory of Solid Waste Treatment and Resource RecycleMinistry of Education of ChinaMianyangPeople’s Republic of China
  3. 3.Fundamental Science on Nuclear Wastes and Environmental Safety LaboratorySouthwest University of Science and TechnologyMianyangPeople’s Republic of China

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