引用本文:
张倩, 乌东北, 包伯荣. 8-羟基喹啉萃取Pr3+,Nd3+的机理探讨[J]. 应用化学,
2008, 25(5): 609-612.
Citation: ZHANG Qian, WU Dong-Bei, BAO Bo-Rong. Extraction of Praseodymium and Neodymium with 8-Hydroxyquinoline[J]. Chinese Journal of Applied Chemistry, 2008, 25(5): 609-612.
Citation: ZHANG Qian, WU Dong-Bei, BAO Bo-Rong. Extraction of Praseodymium and Neodymium with 8-Hydroxyquinoline[J]. Chinese Journal of Applied Chemistry, 2008, 25(5): 609-612.
8-羟基喹啉萃取Pr3+,Nd3+的机理探讨
摘要:
研究了8-羟基喹啉(HQ)从盐酸介质中萃取Pr3+,Nd3+的行为。通过对Pr3+,Nd3+萃取平衡常数的测定结果发现,8-羟基喹啉对Pr3+,Nd3+的萃取反应具有相近的平衡常数。Kex(Pr3+)=10-11.83,Kex(Nd3+)=10-11.70。从稀释剂的种类,水相酸度,萃取剂浓度,Ac-浓度4个方面探讨了8-羟基喹啉萃取Pr3+,Nd3+的机理。结果显示,Ac-在溶液中分别与Pr3+,Nd3+络合,并以Pr(Ac-)2+,Nd(Ac-)2+的形式参与萃取反应;不同稀释剂随着介电常数的增大,萃取率逐渐变小,萃取率的顺序为:庚烷> 环己胺> 四氯化碳> 二甲苯> 甲苯> 氯仿> 二氯甲烷。探讨了8-羟基喹啉萃取Pr3+,Nd3+的机理。
English
Extraction of Praseodymium and Neodymium with 8-Hydroxyquinoline
Abstract:
In this paper,the extraction behaviours of Pr(Ⅲ) and Nd(Ⅲ) from equeous chloride acid medium employing 8-hydroquiloine (HQ) were studied.Equilibrium constant (Kex) in the extraction of Pr(Ⅲ) and Nd(Ⅲ) with 8-hydroxyquinoline in heptane was studied.The results show that the equilibrium constants of praseodymium and neodymium are nearly equal,Kex(Pr3+)=10-11.83,Kex(Nd3+)=10-11.70.The effect of aqueous acidity on the extraction of Pr3+ and Nd3+ with 8-hydroxyquinoline was discussed.The effects of extractant concentraction,different diluents and acetate ion on the extraction reaction were also studied.The results show that acetate ions took part in the extraction reaction in the forms of Pr(Ac-)2+,Nd(Ac-)2+,respectively;with increasing dielectric constant of dilution,the extraction percent decrease and the order is dichloromethane
-
Key words:
- Hydroxyquinoline
- / extraction
- / praseodymium
- / neodymium
-
-
扫一扫看文章
计量
- PDF下载量: 7
- 文章访问数: 479
- HTML全文浏览量: 69
下载:
-
-
扫一扫关注我们