Journal
CHEMICAL ENGINEERING JOURNAL
Volume 442, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.136377
Keywords
Radionuclide remediation; Ion exchange; Cesium; Strontium; Selectivity
Categories
Funding
- National Natural Sci-ence Foundation of China [U21A20296, 22076185, 21771183]
- Natural Science Foundation of Fujian Province [2020 J06033]
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In this study, microporous metal sulfides based on three-dimensional clusters were used as adsorbents for the efficient removal of Cs+ and Sr2+ ions. The adsorbents showed excellent ion exchange properties, including ultrafast kinetics, high adsorption capacities, wide pH durability, and high selectivity. This research is of great importance for environmental remediation.
The selective capture of Cs-137 and 90Sr with strong radiotoxicity is of great significance for environmental remediation and human health. However, it is challenging to efficiently sequester Cs-137+ and Sr-90(2+) ions from aqueous solutions due to their high solubility and environmental mobility. Herein, two three-dimensional (3D) clusters-based microporous metal sulfides with gamma radiation resistance were used for the removal of Cs+ and Sr2+ ions by the ion exchange method, namely [MeNH3](5.5)[Me2NH2](0.5)In10S18.7H2O (1) and [Me2NH2](6)In10S(18) (2). Both compounds feature two-fold interpenetrating zeolite-type frameworks of [In10S18]n6n-, and small protonated methylamine and/or dimethylamine cations are located in the pores of 1 and 2. Prior to this work, the protonated organic amines with large size were normally presented in Tn cluster-based microporous sulfides as structure-directing agents (SDA). As a result, a stepwise activation strategy was usually applied to activate their ion exchange properties. Herein, the application of small-molecule amines as SDA imparts the direct and excellent Cs+ and Sr2+ ion exchange properties of title Tn cluster-based sulfides. They exhibit ultrafast kinetics, high adsorption capacities, wide pH durability and high selectivity for Cs+ and Sr2+ ions. Especially, 1 shows not only extremely high ion exchange capacity (qmCs = 564.2 mg/g and qmSr = 151.2 mg/g) superior to other reported adsorbents, but also high affinity and selectivity for Sr2+. Moreover, both compounds can be easily regenerated and reused for 5 cycles. This work shows that zeolite-type sulfides based on supertetrahedral clusters are promising adsorbents for the effective removal of Cs+ and Sr2+ ions for environmental remediation.
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