The effect of ionic strength on the extraction of Thorium(IV) from nitrate solution by didodecylphosphoric acid (HDDPA)

被引：22
|
作者：
Bayyari, M. A. [1 ]
Nazal, M. K. [1 ]
Khalili, F. A. [1 ]
机构：
[1] Univ Jordan, Dept Chem, Amman 11942, Jordan
来源：
JOURNAL OF SAUDI CHEMICAL SOCIETY | 2010年 / 14卷 / 03期
关键词：
Ionic strength; Extraction; Metal chelate complexes; Synergistic effect; Deionized water; Spontaneous process; NITRIC-ACID;
D O I：
10.1016/j.jscs.2010.04.007
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Extraction of Th(IV) ion from nitrate media at high ionic strength (I = 1.00, 3.00. 5.00 and 7.00 M) using didodecylphosphoric acid was studied. The effect of HDDPA concentration, ionic strength, pcH and temperature on the extraction processes have been studied in nitrate media. From the equation of the extraction process, (K(ex)) extraction constant can be calculated from the distribution ratio D(c) values at different temperatures. Enthalpy, free energy and entropy changes were determined. The composition of the complex formed were established to correspond to [Th(X)(4)(HR(2))y]org, where X = NO(3)(-) and Y = 1 or 2, HR(2) = HDDPA molecule and R(2) = deprotonated HDDPA molecule. (C) 2010 King Saud University. All rights reserved.
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收藏
页码：311 / 315
页数：5
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