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Synergistic adsorption behavior of a silica-based adsorbent toward palladium, molybdenum, and zirconium from simulated high-level liquid waste
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2021-01-15 , DOI: 10.1016/j.jhazmat.2021.125136
Hao Wu , Seong-Yun Kim , Misako Miwa , Shigeo Matsuyama

In this study, the synergistic adsorption behavior of palladium [Pd(II)], molybdenum [Mo(VI)], and zirconium [Zr(IV)] in simulated high-level liquid waste was systematically investigated based on various factors, such as the contact time, concentration of nitric acid, adsorption amount, and temperature using a silica-based adsorbent impregnated with N,N′-dimethyl-N,N′-di-n-hexyl-thiodiglycolamide (Crea) and 2, 2′, 2′ -nitrilotris[N,N-bis(2-ethylhexyl)acetamide] (TAMIA-EH). The adsorption rates of Pd(II), Mo(VI), and Zr(IV) in this synergistic adsorption system were high; thus, equilibrium states could be obtained in only 1 h with high uptake percentages of more than 90%. The adsorption abilities of Pd(II), Mo(VI), and Zr(IV) were only slightly affected by variation in the concentration of nitric acid in the range of 0.1–5 M and solution temperature in the range of 288–313 K. Selective stripping of the adsorbed Re(VII), Pd(II), Zr(IV), and Mo(VI) was successfully achieved under elution with 5 M HNO3, 0.2 M Tu (pH 1), 50 mM DTPA (pH 2), and 50 mM DTPA dissolved in 0.5 M Na2CO3 (pH 11) solutions using the chromatography method. In addition, the adsorption performance in solid-state was studied using the particle-induced X-ray emission (PIXE) method; the obtained results were in good agreement with the results obtained via column separation.



中文翻译:

二氧化硅基吸附剂对模拟高放废液中钯,钼和锆的协同吸附行为

在这项研究中,基于多种因素,系统地研究了钯[Pd(II)],钼[Mo(VI)]和锆[Zr(IV)]在模拟高放废液中的协同吸附行为。N,N'-二甲基-N,N'-二-正己基硫代二甘醇酰胺(Crea)和2,2 '浸渍的二氧化硅基吸附剂的接触时间,硝酸浓度,吸附量和温度2'-硝苯并[ N,N-双(2-乙基己基)乙酰胺](TAMIA-EH)。在这种协同吸附系统中,Pd(II),Mo(VI)和Zr(IV)的吸附率很高。因此,仅在1小时内即可获得平衡状态,且摄取率高达90%以上。Pd(II),Mo(VI)和Zr(IV)的吸附能力仅受硝酸浓度在0.1-5 M范围内和溶液温度288-313 K范围内变化的影响吸附的。选择性汽提的Re(VII),加入Pd(II),锆(IV),和Mo(VI)被成功下洗脱用5M HNO实现3,0.2M涂(pH值为1),50 mM的DTPA(pH值2),并将50 mM DTPA溶解在0.5 M Na 2 CO 3中(pH 11)溶液使用色谱法。此外,使用粒子诱导X射线发射(PIXE)方法研究了固态吸附性能。获得的结果与通过柱分离获得的结果非常吻合。

更新日期:2021-01-21
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