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Kinetics and the difference for extraction of praseodymium and neodymium from nitrate aqueous solution by A336NO_3 using the single drop technique
Xiaoqin Wang1; Kun Huang1; Wenjuan Cao2; Pan Sun2; Weiyuan Song2; Huizhou Liu2
2020
Source Publication中国化学工程学报:英文版
ISSN1004-9541
Volume28.0Issue:005Pages:1326
AbstractThe kinetics and the difference for Pr(Ⅲ)and Nd(Ⅲ)extraction from nitrate aqueous solution using trialkylmethylammonium nitrate(A336NO3)as extractant were investigated by the single drop technique.The dependence of the extraction rate of Pr(Ⅲ)and Nd(Ⅲ)on the concentrations of free Pr(Ⅲ)and Nd(Ⅲ)ions,the concentrations of Na NO3 and H+in aqueous solutions,and the concentrations ofA336NO3in kerosene solutions were discussed and the corresponding extraction rate equations for Pr(Ⅲ)and Nd(Ⅲ)were obtained.These equations demonstrated that the reaction rate constant of Pr(Ⅲ)withA336NO3was double than that of Nd(Ⅲ).The effect of the addition of diethylenetriaminepentaacetic acid(DTPA)on the difference in the extraction rate of Pr(Ⅲ)and Nd(Ⅲ)byA336NO3was also investigated.It was revealed that the difference in the complex formation rates of Pr(Ⅲ)and Nd(Ⅲ)with DTPA made a significant impact on the difference in the extraction rates of Pr(Ⅲ)and Nd(Ⅲ)withA336NO3.The ratio of extraction rates of Pr(Ⅲ)to Nd(Ⅲ)withA336NO3was in proportion to the ratio of complex formation rates of Pr(Ⅲ)to Nd(Ⅲ)with DTPA.The extraction rate difference for Pr(Ⅲ)and Nd(Ⅲ)withA336NO3increased due to a higher complex formation rate constant of DTPA with the free and un-complexed Nd(Ⅲ)ions in the aqueous nitrate solution than that with Pr(Ⅲ)ions.Therefore,the addition of DTPA in the aqueous nitrate solution is an effective method to intensify the separation of Pr(Ⅲ)and Nd(Ⅲ)in kinetics.The study on the extraction mechanism indicated that both the extraction of Pr(Ⅲ)and Nd(Ⅲ)byA336NO3were diffusion controlled,and the reactions obeyed SN2 mechanism.The present work highlights a possible approach to strengthen the kinetic separation of Pr(Ⅲ)and Nd(Ⅲ).
KeywordPraseodymium Neodymium A336NO3 Kinetics Single drop technique
Language英语
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/47471
Collection中国科学院过程工程研究所
Affiliation1.School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing
2.CAS Key Laboratory of Green Process and Engineering,Institute of Process Engineering,Chinese Academy of Sciences
3.中国科学院大学
Recommended Citation
GB/T 7714
Xiaoqin Wang,Kun Huang,Wenjuan Cao,et al. Kinetics and the difference for extraction of praseodymium and neodymium from nitrate aqueous solution by A336NO_3 using the single drop technique[J]. 中国化学工程学报:英文版,2020,28.0(005):1326.
APA Xiaoqin Wang,Kun Huang,Wenjuan Cao,Pan Sun,Weiyuan Song,&Huizhou Liu.(2020).Kinetics and the difference for extraction of praseodymium and neodymium from nitrate aqueous solution by A336NO_3 using the single drop technique.中国化学工程学报:英文版,28.0(005),1326.
MLA Xiaoqin Wang,et al."Kinetics and the difference for extraction of praseodymium and neodymium from nitrate aqueous solution by A336NO_3 using the single drop technique".中国化学工程学报:英文版 28.0.005(2020):1326.
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