K(2x) Sn(4-x) S(8-x) (x = 0.65-1): a new metal sulfide for rapid and selective removal of Cs(+), Sr(2+) and UO(2)(2+) ions.
K(2x) Sn(4-x) S(8-x) (x = 0.65-1): a new metal sulfide for rapid and selective removal of Cs(+), Sr(2+) and UO(2)(2+) ions.
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DOI：
10.1039/c5sc03040d
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发表时间：
2016-02-01
期刊：
影响因子：
8.4
通讯作者：
Kanatzidis MG
中科院分区：
文献类型：
--
作者：
Sarma D;Malliakas CD;Subrahmanyam KS;Islam SM;Kanatzidis MG
报道了在不同条件下具有良好的Cs ~+、Sr ~（2+）和UO ~（2+）离子交换性能的材料K_2xSn ~（4-x）S ~（8-x）（x = 0.65 ~（-1），KTS-3）的合成和晶体结构。铀的裂变产生放射性核素137 Cs和90 Sr，它们是乏核燃料的主要成分。137 Cs和90 Sr的半衰期接近30年，因此它们对人类生命和环境有害。在高盐浓度存在的情况下，从工业核废物中选择性地去除这些放射性核素对于安全储存是必要的。本文报道了一种在不同条件下具有良好的Cs ~+、Sr ~（2+）和UO ~（2+）离子交换性能的材料K_2xSn ~（4-x）S ~（8-x）（x = 0.65 ~（-1），KTS-3）的合成和晶体结构。该化合物采用层状结构，由可交换的钾离子夹在无限层的八面体和四面体锡中心之间。K2 xSn 4-xS 8-x（x = 0.65-1，KTS-3）属单斜晶系，空间群为P21/c，晶胞参数a = 13.092（3）B = 16.882（2），c = 7.375（1），β = 98.10（1）°。细化的单晶衍射数据显示，存在的Sn空位的四面体是长程有序的。KTS-3的层间钾离子可与Cs+、Sr ~（2+）和UO ~（2+）交换。KTS-3在宽pH范围内表现出快速有效的离子交换行为。KTS-3的分配系数（Kd）在中性pH下（Cs+、Sr 2+和UO 22+分别为7.4、6.9、5.7 ppm; V/m = 1000 mL g-1）对Cs+（5.5 × 104）、Sr 2+（3.9 × 105）和UO 22+（2.7 × 104）具有较高的分配系数。KTS-3在高盐浓度和宽pH范围内表现出令人印象深刻的Cs+、Sr 2+和UO 22+离子交换性能，加上低成本、环境友好的性质和容易的合成，突出了其在处理核废料方面的潜力。
The synthesis and crystal structure of K2xSn4–xS8–x (x = 0.65–1, KTS-3) a material which exhibits excellent Cs+, Sr2+ and UO22+ ion exchange properties in varying conditions are reported. The fission of uranium produces radionuclides, 137Cs and 90Sr, which are major constituents of spent nuclear fuel. The half-life of 137Cs and 90Sr is nearly 30 years and thus that makes them harmful to human life and the environment. The selective removal of these radionuclides in the presence of high salt concentrations from industrial nuclear waste is necessary for safe storage. Here we report the synthesis and crystal structure of K2xSn4–xS8–x (x = 0.65–1, KTS-3) a material which exhibits excellent Cs+, Sr2+ and UO22+ ion exchange properties in varying conditions. The compound adopts a layered structure which consists of exchangeable potassium ions sandwiched between infinite layers of octahedral and tetrahedral tin centers. K2xSn4–xS8–x (x = 0.65–1, KTS-3) crystallizes in the monoclinic space group P21/c with cell parameters a = 13.092(3) Å, b = 16.882(2) Å, c = 7.375(1) Å and β = 98.10(1)°. Refinement of the single crystal diffraction data revealed the presence of Sn vacancies in the tetrahedra that are long range ordered. The interlayer potassium ions of KTS-3 can be exchanged for Cs+, Sr2+ and UO22+. KTS-3 exhibits rapid and efficient ion exchange behavior in a broad pH range. The distribution coefficients (Kd) for KTS-3 are high for Cs+ (5.5 × 104), Sr2+ (3.9 × 105) and UO22+ (2.7 × 104) at neutral pH (7.4, 6.9, 5.7 ppm Cs+, Sr2+ and UO22+, respectively; V/m ∼ 1000 mL g–1). KTS-3 exhibits impressive Cs+, Sr2+ and UO22+ ion exchange properties in high salt concentration and over a broad pH range, which coupled with the low cost, environmentally friendly nature and facile synthesis underscores its potential in treating nuclear waste.
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