Hollow fiber supported liquid membrane studies using a process compatible solvent containing calix[4]arene-mono-crown-6 for the recovery of radio-cesium from nuclear waste
Hollow fiber supported liquid membrane studies using a process compatible solvent containing calix[4]arene-mono-crown-6 for the recovery of radio-cesium from nuclear waste
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DOI：
10.1016/j.seppur.2016.06.036
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发表时间：
2016-10
影响因子：
8.6
通讯作者：
P. Jagasia;S. Ansari;D. R. Raut;P. S. Dhami;P. M. Gandhi;Amar Kumar;P. Mohapatra
中科院分区：
文献类型：
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作者：
P. Jagasia;S. Ansari;D. R. Raut;P. S. Dhami;P. M. Gandhi;Amar Kumar;P. Mohapatra
使用中空纤维支撑液膜 (HFSLM) 技术评估双辛氧基杯[4]芳烃单冠 6 (CMC) 从酸性进料溶液中分离放射性铯的效果。我们进行了溶剂萃取和平板支撑液膜 (FSSLM) 研究，以优化后续 HFSLM 研究所需的条件。随着硝酸浓度从 1 M HNO3 增加到 6 M HNO3，HFSLM 中铯的渗透速率稳步增加。在 4 M HNO3 的中等酸度（即高放废物的酸浓度）下，可以在 300 mL 规模的操作 2 小时内实现接近定量 (>99%) 的铯运输。由于存在高浓度铯 (0.32 g/L)，在模拟高放废物条件下传输受到抑制，但在 6 小时内观察到 >90% 的传输。从连续运行 12 天的监测来看，膜的稳定性非常出色。计算扩散金属/配体物质的渗透系数、传质系数和各种扩散参数，以了解铯的渗透行为。目前的工作探索了 CMC 在中空纤维接触器中用于放射性废物处理的可能性，其中配体库存非常低。
Bis-octyloxy-calix[4]arene-mono-crown-6 (CMC) was evaluated for radio-cesium separation from acidic feed solutions using hollow fiber supported liquid membrane (HFSLM) technique. Solvent extraction and flat sheet supported liquid membrane (FSSLM) studies were pursued to optimize the conditions required for the subsequent HFSLM studies. The permeation rate of cesium in HFSLM increased steadily with nitric acid concentration from 1 M HNO3to 6 M HNO3. At a moderate acidity of 4 M HNO3, which is the acid concentration of the high level waste, near quantitative (>99%) transport of cesium was possible within 2 h of operation at 300 mL scale. Transport was suppressed under simulated high level waste conditions due to the presence of large concentrations of cesium (0.32 g/L), but >90% transport was observed in 6 h. Stability of the membrane was excellent as monitored from 12 days of continuous operation. The permeability coefficient, mass transfer coefficient and various diffusional parameters of the diffusing metal/ligand species were calculated to understand the permeation behvaiour of cesium. The present work explored the possible use of CMC in hollow fiber contactor for radioactive waste treatment where the ligand inventory is very low.