Implication of Thermodynamic Functions and Speciation Diagrams in Analysis of Solvent Extraction Behavior of Samarium from Acidic Solutions

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2021-09-10 DOI:10.22068/IJMSE.2105

H. Tavakoli, M. Aboutalebi, H. Seyedein, S. N. Ashrafizadeh

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引用次数: 0

Abstract

Solvent extraction of samarium from aqueous solutions by two different types of extractants, namely D2EHPA and PC88A, in kerosene was investigated. Through identification of speciation diagrams, the chemically stable complex of samarium in different acidic solutions (H2SO4, HCl and HNO3) were studied. Regarding the various types of samarium species in sulfate medium in comparison with other acidic environments, H2SO4 and HNO3 media were chosen to examine the extraction behavior of samarium complexes. Thermodynamic parameters of samarium extraction reactions by D2EHPA and PC88A from aqueous solutions of HNO3 and H2SO4 were calculated as ∆G°D2EHPA-HNO3 , ∆G°D2EHPA-H2SO4 , ∆G°PC88A-HNO3 , ∆G°PC88A-H2SO4 equal to -5.58, 3.40, 6.70 and 14.26, and the corresponding ΔHo values were equal to -9.38, -2.75, 4.01 and 16.95 kJ/mol, respectively. According to the results, D2EHPA seemed to be a more efficient extractant than PC88A and nitric aqueous solution was a better media than the sulfuric type. The synergistic effect of binary extractants revealed that synergistic factors were 2.94 and 5.74 in sulfuric and nitric solutions, respectively, for a D2EHPA:PC88A ratio of 2:3. The compositions of extracted complexes by D2EHPA and PC88A in sulfuric and nitric solutions were SmH3A6 and SmH3B6, respectively. Thermodynamic parameters of extraction reactions were calculated as: Ke equal to 9.513, 0.254, 0.067, 0.003 and ∆S°D2EHPA-HNO3 , ∆S°D2EHPA-H2SO4 , ∆S°PC88A-HNO3 , ∆S°PC88A-H2SO4 values were equal to -12.75, -20.64, -9.03, and 9.03 (J mol-1) respectively.

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热力学函数和形态图在分析酸性溶液中钐的溶剂萃取行为中的意义

研究了用两种不同类型的萃取剂D2EHPA和PC88A萃取煤油水溶液中的钐。通过形态图的鉴定，研究了钐在不同酸性溶液(H2SO4、HCl和HNO3)中的化学稳定性。针对硫酸盐介质中钐种类繁多，与其他酸性环境相比，选择H2SO4和HNO3介质考察了钐配合物的萃取行为。D2EHPA和PC88A从HNO3和H2SO4水溶液中萃取samarium的热力学参数计算为∆G°D2EHPA-HNO3、∆G°D2EHPA-H2SO4、∆G°PC88A-HNO3、∆G°PC88A-H2SO4分别为-5.58、3.40、6.70和14.26，对应的ΔHo值分别为-9.38、-2.75、4.01和16.95 kJ/mol。结果表明，D2EHPA是一种比PC88A更有效的萃取剂，硝酸水溶液是一种比硫酸溶液更好的萃取介质。在D2EHPA:PC88A比为2:3的硫酸溶液和硝酸溶液中，双萃取剂的协同效应分别为2.94和5.74。D2EHPA和PC88A在硫酸和硝酸溶液中提取的配合物的组成分别为SmH3A6和SmH3B6。提取反应的热力学参数计算为:Ke = 9.513、0.254、0.067、0.003，∆S°D2EHPA-HNO3、∆S°D2EHPA-H2SO4、∆S°PC88A-HNO3、∆S°PC88A-H2SO4分别= -12.75、-20.64、-9.03、9.03 (J mol-1)。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.