4.6 Article

The Effects of Oxygen Functional Groups on Graphene Oxide on the Efficient Adsorption of Radioactive Iodine

Journal

MATERIALS
Volume 13, Issue 24, Pages -

Publisher

MDPI
DOI: 10.3390/ma13245770

Keywords

iodine adsorption; DFT method; oxygen-containing functional group; graphene oxide

Funding

  1. National Natural Science Foundation of China [21906128, 11775166]
  2. Young Talent Support Plan of Xi'an Jiaotong University [7121181102]
  3. program of Fundamental Research Funds for the Central Universities [XJH012019018]
  4. key project of Intergovernmental International Scientific and Technological Innovation Cooperation in China [2016YFE0128900]

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Oxygen-containing functional groups tend to induce a strong interaction between solid adsorbents and iodine molecules, yet have not been systematically investigated. Herein, on the basis of a series of nitric acid-treated graphene oxide (GO) with different contents of oxygen functional groups for iodine adsorption, it was found that the iodine uptake capacity is proportionate to the oxygen content and the diversities of oxygen-containing groups. The density functional theory (DFT) calculation results also suggest that oxygen-containing groups result in strong interactions between iodine molecules and the adsorbents through a covalent bond-forming process, among which -OH groups possess a higher adsorption energy averagely. Such theoretical and experimental work deepens our understanding of the effects of oxygen functional groups on iodine adsorption and provides novel ideas for future design and synthesis of high-performance solid adsorbents for radioactive iodine.

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