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Reduction‐Induced Highly Selective Uptake of Cesium Ions by an Ionic Crystal Based on Silicododecamolybdate
Author(s) -
Seino Saori,
Kawahara Ryosuke,
Ogasawara Yoshiyuki,
Mizuno Noritaka,
Uchida Sayaka
Publication year - 2016
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201511633
Subject(s) - chemistry , adsorption , ion exchange , caesium , ionic bonding , alkali metal , inorganic chemistry , prussian blue , aqueous solution , crystal (programming language) , selective adsorption , metal , selectivity , qualitative inorganic analysis , nuclear chemistry , ion , organic chemistry , catalysis , electrode , electrochemistry , computer science , programming language
Cation adsorption and exchange has been an important topic in both basic and applied chemistry relevant to materials synthesis and chemical conversion, as well as purification and separation. Selective Cs + uptake from aqueous solutions is especially important because Cs + is expensive and is contained in radioactive wastes. However, the reported adsorbents incorporate Rb + as well as Cs + , and an adsorbent with high selectivity toward Cs + has not yet been reported. Highly selective uptake of Cs + by an ionic crystal (etpyH) 2 [Cr 3 O(OOCH) 6 (etpy) 3 ] 2 [α‐SiMo 12 O 40 ]⋅3 H 2 O (etpy =4‐ethylpyridine) is described. The compound incorporated up to 3.8 mol(Cs + ) mol(s) −1 (where s=solid) by cation‐exchange with etpyH + and reduction of silicododecamolybdate with ascorbic acid. The amount of Cs + uptake was comparable to that of Prussian blue, which is widely recognized as a good Cs + adsorbent. Moreover, other alkali‐metal and alkaline‐earth‐metal cations were almost completely excluded (<0.2 mol mol(s) −1 ).