Efficient Cs+-Sr2+ Separation over a Microporous Silver Selenidostannate Synthesized in Deep Eutectic Solvent
Efficient Cs+-Sr2+ Separation over a Microporous Silver Selenidostannate Synthesized in Deep Eutectic Solvent
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低共熔溶剂中合成的微孔硒锡酸银的高效分离 Cs -Sr2
DOI：
10.1021/acs.inorgchem.0c00770
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发表时间：
2020-07-20
影响因子：
4.6
通讯作者：
Wang, Cheng
中科院分区：
文献类型：
--
作者：
Ding, Dong;Cheng, Lin;Wang, Cheng
采用新型微孔硒锡酸银[NH_3CH_3]（0.5）[NH_2（CH_3）（2）]（0.25）Ag_（1.25）SnSe_3（AgSnSe-1）离子交换技术，实现了Cs ~+-Sr ~（2+）的高效分离。这种材料是在深共熔溶剂（DES）中合成的，其中烷基铵阳离子在微孔的构建中发挥重要的结构导向作用，从而允许对Cs+对Sr 2+的选择性离子交换。比K-d（Sr）（87.7 mL g（-1））大得多的K-d（Cs）（1.06 X 10（4）mL g（-1））促成了类似于121.4的出色分离因子SFcs/sr，其在无机材料中排名第一。用AgSnSe-1填充的离子交换柱在10000床体积的连续流动中表现出显著的分离效果，Cs+和Sr 2+的去除率分别为99.9%和0 ± 5.5%。AgSnSe-1在1-12的宽pH范围内表现出优异的抗β和γ辐射性和化学稳定性。硒浸出水平低于饮用水的安全指导值，突出了AgSnSe-1的环境友好性。高Cs+交换性能几乎不受Na+、Mg 2+和Ca 2+阳离子的影响。载Cs+的产物AgSnSe-1Cs可以方便地洗脱回收，突出了开放骨架金属硒化物在核废物处理和可再生能源利用中的巨大潜力。
Efficient Cs+-Sr2+ separation, highly desirable for radionuclide recovery in medical and industrial applications, was achieved by the ion exchange technique over a novel microporous silver selenidostannate, [NH3CH3](0.5)[NH2(CH3)(2)](0.25)Ag1.25SnSe3 (AgSnSe-1). This material was synthesized in deep eutectic solvent (DES), where the alkylammonium cations play significant structure-directing roles in the construction of micropores that allow for selective ion exchange toward Cs+ against Sr2+. The much greater K-d(Cs )(1.06 X 10(4) mL g(-1)) over K-d(Sr) (87.7 mL g(-1)) contributes to an outstanding separation factor SFcs/sr of similar to 121.4 that is top-ranked among inorganic materials. An ion exchange column filled with AgSnSe-1 exhibits a remarkable separation effect for 10 000 bed volumes of continuous flow, with removal rates of similar to 99.9% and similar to 0 +/- 5.5% for Cs+ and Sr2+, respectively. AgSnSe-1 exhibits excellent beta and gamma radiation resistances and a chemical stability over a broad pH range of 1-12. The Se leaching level below the safe guideline value for drinking water highlights the environmental-friendly nature of AgSnSe-1. The high Cs+ exchange performance is almost unaffected by Na+, Mg2+, and Ca2+ cations. The Cs+-laden product AgSnSe-1Cs can be facilely eluted for recycling us; highlighting the great potential of open framework metal selenides in nuclear waste treatment and renewable energy utilization.