Cs+/Na+ Separation by Nanofiltration-Complexation with Resorcinarene
Cs+/Na+ Separation by Nanofiltration-Complexation with Resorcinarene
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DOI：
10.1081/ss-200026721
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发表时间：
2004-08
影响因子：
2.8
通讯作者：
A. Sorin;S. Pellet-Rostaing;A. Favre-Réguillon;M. Lemaire
中科院分区：
文献类型：
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作者：
A. Sorin;S. Pellet-Rostaing;A. Favre-Réguillon;M. Lemaire
摘要铯-137被认为是最危险的放射性物质之一，很容易进入环境并污染环境。研究了以间苯二酚为络合剂，在Nanomax-50膜上纳滤-络合分离铯/钠的最佳条件。用电位滴定法测定了间苯二酚的质子化常数(logKHI=9.24±0.06；logKh2=10.21±0.03；logKh3=8.59±0.07；logKh4=7.85±0.08)。Cs+-间苯二酚的表观生成常数(logKCsl.)用紫外分光光度法测定了间苯二酚对铯络合物生成的选择性。研究了pH值、[间苯二酚]/[Cs+]比等参数对铯的截留率达到80%。用~1H和~(13)C核磁共振法研究了间苯二酚在D2O中的稳定性与pH和NaNO_3浓度的关系，测定了间苯二酚在pH为9的[NaNO_3]=2mol/L中的稳定性，虽然在pH 12和钠浓度相同的情况下，间苯二酚的稳定性为5天，但在2×104倍钠存在下，当pH为10，[间苯二酚]/[Cs+]=25或pH=11，[间苯二酚]/[Cs+]=20时，铯的截留率达到80%。
ABSTRACT Cesium-137 is considered as one of the most dangerous radioactive materials that can be very easy move into the environment and contaminate it. This study aims to determine the optimum conditions for cesium/sodium separation by nanofiltration (NF)-complexation on Nanomax 50 membrane with resorcinarene as the complexing agent. Protonation constants of resorcinarene were determined by potentiometric titration in 0.1mol/L NaNO3 at 25°C (log KHI = 9.24 ± 0.06; log KH2 = 10.21 ± 0.03; log KH3 = 8.59 ± 0.07; log KH4 = 7.85 ± 0.08). The apparent formation constants of the Cs+-resorcinarene (log KCsl.) were determined by UV spectrophotometry to evaluate the selectivity of resorcinarene toward cesium complex formation as a function of the pH. Parameters such as the pH, [resorcinarene]/[Cs+] ratio were studied to reach 80% of cesium rejection in 3 mol/Lof NaNO3. The stability of resorcinarene was studied as a function of the pH and the concentration of NaNO3 by 1H and 13C NMR studies in D2O, Resorcinarene stability up to 30 days in [NaNO3] = 2 mol/L at pH 9 was determined, although at pH 12 and with the same sodium concentration, resorcinarene stability was 5 days, Finally, the conditions to reach 80% of cesium rejection in the presence of 2 × 104 fold of sodium were found at pH 10 with [resorcinarene]/[Cs+] ratio of 25 or at pH 11 wilh [resorcinarene]/[Cs+] ratio of 20.