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首页> 外文期刊>Separation and Purification Technology >Ion exchange of ~85Sr, ~134Cs and ~57Co in sodium titanosilicate and the effect of crystallinity on selectivity
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Ion exchange of ~85Sr, ~134Cs and ~57Co in sodium titanosilicate and the effect of crystallinity on selectivity

机译：钛硅酸钠中〜85Sr，〜134Cs和〜57Co的离子交换以及结晶度对选择性的影响

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摘要

The uptake of ~85Sr, ~134Cs and ~57Co on a framework sodium titanosilicate of an ideal formula Na_2Ti_2O_3(SiO_4)·2H_2O was investigated. Samples of varying crystallinity were synthesized and this effect on cation affinity was studied. The material exhibited high affinity for cesium in slightly acidic to alkaline solutions, but potassium and the presence of sodium at high pH interfered significantly with selective ~134Cs uptake. The weakly acidic exchanger took up ~85Sr and ~57Co efficiency above neutral pH in 0.1 M NaNO_3. The crystallinity of the material proved to be an important factor in efficient removal of ~85Sr from calcium bearing effluents. The semi-crystallinie titanosilicates had a high affinity for ~85Sr over Ca~(2+) at neutral pH. The affinity for cesium in the presence of potassium was improved as well in samples of lower crystallinity.
机译：研究了理想分子式Na_2Ti_2O_3（SiO_4）·2H_2O的骨架钛硅酸钠对〜85Sr，〜134Cs和〜57Co的吸收。合成了不同结晶度的样品，并研究了其对阳离子亲和力的影响。该物质在弱酸性至碱性溶液中对铯具有很高的亲和力，但是钾和钠在高pH下的存在显着干扰了选择性〜134Cs的吸收。在中性pH值以上，在0.1 M NaNO_3中，弱酸性交换剂吸收〜85Sr和〜57Co的效率。事实证明，该材料的结晶度是有效去除含钙废水中〜85Sr的重要因素。在中性pH下，半结晶性钛硅酸盐对Ca〜（2+）的〜85Sr具有高亲和力。在较低结晶度的样品中，在钾存在下对铯的亲和力也得到改善。

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