Effective separation of palladium from simulated high level radioactive waste
Effective separation of palladium from simulated high level radioactive waste
复制标题
DOI：
10.1007/s10967-010-0870-4
复制
发表时间：
2011-04
影响因子：
1.6
通讯作者：
D. Parajuli;K. Hirota;N. Seko
中科院分区：
文献类型：
--
作者：
D. Parajuli;K. Hirota;N. Seko
针对从高放射性废液（HLW）中选择性回收钯的目的，通过对日本雪松木粉（CWP）进行改性，制备了一种螯合硫酰胺型吸附剂CWP-TU。分别使用对流烤箱和微波加热进行改造，发现微波加热比烤箱加热更有效。 CWP-TU 对硝酸介质中 Pd(II) 的吸附进行了广泛研究。批量测试表明，3 M 或更高的硝酸浓度有利于 Pd(II) 的负载。在伽马辐照条件下 Pd(II) 的一致吸附证明了在实际 HLW 中使用 CWP-TU 的可行性。此外，模拟 HLW 溶液中仅吸附 Pd(II) 验证了吸附剂仅对钯有选择性，并且共存金属离子对其对 Pd(II) 的亲和力没有影响。 CWP-TU 在 30 °C 下的最大 Pd(II) 负载能力为 0.98 mol/kg，在伽马辐照下为 1.04 mol/kg。使用一些离子交换树脂的比较研究表明，这些树脂要么在硝酸盐介质中无效，要么在辐射下缺乏稳定性。
Aiming the selective recovery of palladium from high level radioactive liquid waste (HLW), a chelating thiamide type sorbent, CWP–TU, was prepared by the modification of Japanese cedar wood powder (CWP). Convection oven and microwave heating were separately used for modification purpose and found that microwave heating is more effective over oven heating. CWP–TU was extensively studied for the adsorption of Pd(II) from nitric acid medium. The batch test showed that nitric acid concentration of 3 M or higher is favorable for Pd(II) loading. Consistent adsorption of Pd(II) under gamma irradiation condition demonstrated the feasibility of using CWP–TU in real HLW. Also, Pd(II) only adsorption from simulated HLW solution verified the palladium only selectivity of the sorbent as well as the lack of influence of coexisting metal ions on its affinity toward Pd(II). CWP–TU holds maximum Pd(II) loading capacities of 0.98 mol/kg at 30 °C and 1.04 mol/kg under gamma irradiation. A comparative study using some ion exchange resins revealed that the resins are either ineffective in nitrate medium or lack stability under irradiation.