4 years ago

POM Constructed from Super-Sodalite Cage with Extra-Large 24-Membered Channels: Effective Sorbent for Uranium Adsorption

POM Constructed from Super-Sodalite Cage with Extra-Large 24-Membered Channels: Effective Sorbent for Uranium Adsorption
Hao Miao, Weiwei Cheng, Yayu Dong, Yan Xu, Zhibin Zhang, Zhimin Dong, Xingxiang He, Yunhai Liu
A POMs-based sorbent functionalized by phosphate groups: H33Na14MoV24MoVI2(PO4)11O73 has been successfully isolated under hydrothermal conditions. The cooperative assembly of the ring-shaped polyoxometalate structural building unit {P4Mo6} and MoO4 tetrahedra linkers gives rise to an unprecedented supersodalite cage containing approximately spherical cavities with a 8.76 Å diameter. As POMs-based inorganic material, compound 1 was first applied as sorbent to adsorb U(VI) from aqueous solution, exhibiting good stability, high efficiency, and selectivity. The maximum sorption capacity reaches 325.9 mg g–1, which may capture radionuclides through cooperative binding of the phosphate groups. The adsorbed U(VI) could be nearly drastically eluted when using 0.1 M Na2CO3 and the sorption capacity for U(VI) slightly decreased 10.16% through five successive sorption/desorption cycles. This work represents first application of POMs-based inorganic materials as sorbent to adsorb uranium from aqueous solution and provides a feasible approach for the entrapment and recovery of radionuclides.

Publisher URL: http://dx.doi.org/10.1021/acsami.7b07573

DOI: 10.1021/acsami.7b07573

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