Batch and dynamic extraction of uranium(VI) from nitric acid medium by commercial phosphinic acid resin, Tulsion CH-96
Batch and dynamic extraction of uranium(VI) from nitric acid medium by commercial phosphinic acid resin, Tulsion CH-96
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DOI：
10.1007/s10967-007-6888-6
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发表时间：
2008-03
影响因子：
1.6
通讯作者：
K. Venkatesan;K. Shyamala;M. Antony;T. Srinivasan;P. Vasudeva Rao
中科院分区：
文献类型：
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作者：
K. Venkatesan;K. Shyamala;M. Antony;T. Srinivasan;P. Vasudeva Rao
用市售的次膦酸树脂（Tulsion CH-96）研究了在3- 4 M硝酸介质中10−3-10− 2 M浓度的铀（VI）的间歇和动态萃取。研究了铀（VI）的萃取与时间、批量因子（V/m）、硝酸浓度和铀（VI）离子浓度的关系。建立了次膦酸树脂萃取铀（VI）的双重萃取机理。铀（VI）的分配系数（Kd）随硝酸浓度的增加先减小，在1.3M时达到最小值，然后增大。当硝酸浓度为5.0M时，Kd值最大，达2000 ml/g。批萃取数据已拟合成线性化的Langmuir吸附等温线。动态萃取条件下的树脂的性能进行了评估，通过以下系统的突破行为。研究了流速、硝酸浓度和铀离子浓度对体系穿透行为的影响，并用托马斯模型对数据进行了拟合。
Batch and dynamic extractions of uranium(VI) in 10−3–10−2M concentrations in 3–4M nitric acid medium have been investigated using a commercially available phosphinic acid resin (Tulsion CH-96). The extraction of uranium(VI) has been studied as a function of time, batch factor (V/m), concentrations of nitric acid and uranium(VI) ion. Dual extraction mechanism unique to phosphinic acid resin has been established for the extraction of uranium(VI). Distribution coefficient (Kd) of uranium(VI) initially decreases with increasing concentration of nitric acid, reaches a minimum value at 1.3M, followed by increases inKd. A maximumKdvalue of ∼2000 ml/g was obtained at 5.0M nitric acid. Batch extraction data has been fitted into the linearized Langmuir adsorption isotherm. The performance of the resin under dynamic extraction conditions was assessed by following the breakthrough behavior of the system. Effect of flow rate, concentrations of nitric acid and uranium ion in the feed on the breakthrough behavior of the system was studied and the data was fitted using Thomas model.