Group partitioning of minor actinides and rare earths from highly active liquid waste by extraction chromatography utilizing two macroporous silica-based impregnated polymeric composites
Group partitioning of minor actinides and rare earths from highly active liquid waste by extraction chromatography utilizing two macroporous silica-based impregnated polymeric composites
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DOI：
10.1016/j.seppur.2006.10.009
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发表时间：
2007-05
影响因子：
8.6
通讯作者：
A. Zhang;E. Kuraoka;M. Kumagai
中科院分区：
文献类型：
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作者：
A. Zhang;E. Kuraoka;M. Kumagai
采用真空吸附技术，将螯合剂浸渍固定在SiO2-P颗粒的孔中，制备了两种大孔硅基N，N，N′，N′-四辛基-3-氧杂戊烷-1，5-二酰胺（TODGA）和辛基（苯基）-N，N-二异丁基氨甲酰基甲基膦氧化物（CMPO）聚合物复合材料：TODGA/SiO2-P和CMPO/SiO2-P。为了从高活性废液中分离出Am（III）和Cm（III）等长寿命次锕系元素，对15种典型的模拟裂变和非裂变产物进行了负载和洗脱实验。在TODGA/SiO_2-P第一柱中，模拟元素被有效地分离为：（1）未吸附组，（2）MA-lRE-FPs组，（3）hRE组，（4）微量Zr（IV）。MA（III）与Nd（III）在TODGA/SiO_2-P上的吸附和洗脱关系密切，预计MA（III）将沿着流入第二组。在第二组填充有CMPO/SiO_2-P的柱中，在含有0.05M DTPA的MA-lRE-FP中调节酸度至3.0M HNO_3后，MA（III）被分离成（1）Sr（II）和Pd（II），（2）MA-mRE，（3）lRE和（4）Zr（IV）。由于MA（III）在CMPO/SiO2-P上的吸附相似，MA（III）被认为是沿着Gd（III）进入MA-mRE流出液中的。根据MA（III）出现的位置，提出了一种改进的MAREC流程，用于从HLW中长寿命分配MA（III）。
Through an advanced vacuum sucking technique, two macroporous silica-based N,N,N′,N′-tetraoctyl-3-oxapentane-1,5-diamide (TODGA) and octyl(phenyl)-N,N-diisobutylcarbamoyl-methylphoshine oxide (CMPO) polymeric composites, TODGA/SiO2-P and CMPO/SiO2-P, were synthesized by impregnating and immobilizing the chelating agents into the pores of the SiO2-P particles. To partition long-lived minor actinides (MA(III)), such as Am(III) and Cm(III) from highly active liquid waste (HLW), the loading and elution of 15 typically simulated fission and non-fission products from a 3.0M HNO3were performed. In the first column packed with TODGA/SiO2-P, the simulated elements were effectively separated into following groups: (1) non-adsorption group, (2) MA–lRE–FPs group, (3) hRE group, and (4) micro quantity of Zr(IV). MA(III) was predicted to flow into the second group along with Nd(III) due to their close adsorption and elution onto TODGA/SiO2-P. In the second column packed with CMPO/SiO2-P, after conditioning the acidity in MA–lRE–FPs containing 0.05M DTPA to 3.0M HNO3, it was separated into (1) Sr(II) and Pd(II), (2) MA–mRE, (3) lRE, and (4) Zr(IV). MA(III) was believed to flow into MA–mRE effluent along with Gd(III) because of the similar adsorption towards CMPO/SiO2-P. In terms of the position of MA(III) appeared, an improved MAREC process for long-lived MA(III) partitioning from HLW was proposed.