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Efficient and irreversible capture of radioactive strontium ions from nuclear wastewater using metal-organic frameworks with ion trap groups

Abstract

Efficient and irreversible capture of radioactive nuclides is an important environmental protection task when disposing of nuclear wastewater. This paper uses an “ion trapping” concept to design an efficient adsorbent based on a metal-organic framework (MOF), for removal of radioactive strontium from nuclear wastewater. Two functionalized MOFs were achieved by introduction of sulfate or oxalate into the pore structure of MOF-808, giving MOF-808-SO4 and MOF-808-C2O4, respectively. These functionalized MOF-808 materials exhibit excellent ability for removal of Sr2+ from acidic solution due to their particular trapping action, with maximum Sr2+adsorption capacities of 176.56 mg/g and 206.34 mg/g for MOF-808-SO4 and MOF-808-C2O4, respectively, surpassing most other inorganic materials. Additionally, 99% of Sr2+is removed by MOF-808-SO4 and MOF-808-C2O4 after reaching equilibrium. Remarkably, there two functionalized MOF-808 materials exhibited selectivity for removal of Sr2+ from stimulated mixed nuclear wastewater, even when there are 10 times as many co-existing ions than Sr2+ ions, demonstrating that anchoring of the trapping groups are a good way to improve Sr2+ adsorption capacity on MOFs. Moreover, both functionalized MOF-808 materials trap Sr2+ ions irreversibly, suggesting these trapping groups have strong ability to bind with Sr2+. A mechanism study indicated no proton ion-exchange occurred during the adsorption process, so functionalized groups anchored to MOFs play an important role in Sr2+ adsorption. Our present studies provide an efficient way to design new adsorbents for removal of radioactive strontium and other radionuclides from nuclear wastewater.

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Publication details

The article was accepted on 04 Feb 2019 and first published on 08 Feb 2019


Article type: Paper
DOI: 10.1039/C9DT00434C
Citation: Dalton Trans., 2019, Accepted Manuscript

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    Efficient and irreversible capture of radioactive strontium ions from nuclear wastewater using metal-organic frameworks with ion trap groups

    W. Mu, S. du, X. Li, Q. yu, R. hu, H. wei, Y. Yang and S. Peng, Dalton Trans., 2019, Accepted Manuscript , DOI: 10.1039/C9DT00434C

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