Reduction‐Induced Highly Selective Uptake of Cesium Ions by an Ionic Crystal Based on Silicododecamolybdate |
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| Authors: | Saori Seino Ryosuke Kawahara Dr Yoshiyuki Ogasawara Prof Noritaka Mizuno Dr Sayaka Uchida |
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| Institution: | 1. Department of Basic Science, School of Arts and Sciences, The University of Tokyo, Tokyo, Japan;2. Department of Applied Chemistry, School of Engineering, The University of Tokyo, Tokyo, Japan;3. JST-PRESTO, Kawaguchi, Saitama, Japan |
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| Abstract: | 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)2Cr3O(OOCH)6(etpy)3]2α‐SiMo12O40]?3 H2O (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). |
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| Keywords: | cations cesium ion exchange polyoxometalates reduction |
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