A Novel Liquid Emulsion Membrane Containing TODGA as the Carrier Extractant for Am Recovery from Acidic Wastes
A Novel Liquid Emulsion Membrane Containing TODGA as the Carrier Extractant for Am Recovery from Acidic Wastes
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DOI：
10.1080/01496395.2012.730089
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发表时间：
2013-04
影响因子：
2.8
通讯作者：
P. Kandwal;P. Mohapatra
中科院分区：
文献类型：
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作者：
P. Kandwal;P. Mohapatra
采用0.1 M N，N,N′，N′-四辛基-3-草戊烷二胺(TODGA) + 0.5 M正十二烷二正己烯酰胺（DHOA）为萃取剂的液乳膜（LEM）对Am的回收进行了研究。以Span 80（山梨醇单油酸酯）为表面活性剂，以3 M HNO3和0.1 M醋酸缓冲液（pH为4.75）分别为外相和内相制备乳液。优化条件表明，乳剂的制备需要2% Span 80。研究了不同原料酸度、不同体积比、不同浸提剂、不同TODGA浓度等实验条件对酸性溶液中Am的定量去除效果的影响。已观察到较高的传输速率，这可归因于每单位体积可用于质量传输的表面积较高。通过将乳剂加热到80°C，可以实现破乳。实际的酸性放射性废料也被用来测试镅的回收。结果表明，与以前报道的相比，ELM从废物溶液中去除Am（III）的速度更快。
The recovery of Am has been investigated by Liquid Emulsion Membrane (LEM) containing 0.1 M N,N,N′,N′-tetraoctyl-3-oxapentane diamide (TODGA) + 0.5 M di-n-hexyloctanamide (DHOA) in n-dodecane as extractant. Span 80 (sorbitan monooleate) was used as the surfactant for making the emulsion while 3 M HNO3 and 0.1 M acetate buffer (at pH 4.75) were used as the external and internal phases, respectively. Optimized conditions indicated 2% Span 80 was required for making the emulsions. The effect of different experimental conditions such as varying feed acidity, varying volume ratio, different strippants, and varying TODGA concentration have been studied for the quantitative removal of Am from acidic solution. The higher transport rate has been observed which can be attributed to the higher surface area per unit volume available for mass transport. Demulsification was possible by heating the emulsions to 80°C. Actual acidic radioactive waste has also been tested for the recovery of americium. The results show the applicability of ELM for the removal of Am(III) from waste solutions with a faster rate of transport as compared to those reported previously.