Extraction and Separation of Selected Platinum-Group and Base Metal Ions from Nitric Acid Solutions Using Thiodiglycolamides (TDGA) as Novel Extractants
Extraction and Separation of Selected Platinum-Group and Base Metal Ions from Nitric Acid Solutions Using Thiodiglycolamides (TDGA) as Novel Extractants
复制标题
使用硫代二甘醇酰胺 (TDGA) 作为新型萃取剂从硝酸溶液中萃取和分离选定的铂族和贱金属离子
DOI：
10.1080/01496395.2015.1056359
复制
发表时间：
2015
影响因子：
2.8
通讯作者：
A. Alshammari
中科院分区：
文献类型：
--
作者：
E. Mowafy;D. Mohamed;A. Alshammari
合成了三种结构相关的硫代二甘醇酰胺（TDGA），即N，N，N′，N′-四正己基硫代二甘醇酰胺（THTDGA）、N，N，N′，N′-四2-乙基己基硫代二甘醇酰胺（TEHTDGA）和N，N，N′，N′-四正辛基硫代二甘醇酰胺（TOTDGA），并研究了它们在硝酸介质中对Pd（II）、Pt（IV）、Rh（III）、Cu（II）、Ni（II）和Fe（III）的萃取行为。研究了萃取金属离子与结构反应性的关系。与其他研究的金属离子相比，合成的硫代二甘醇酰胺对钯表现出更好的萃取性和选择性。发现Pd（II）在单个萃取步骤中容易地与其他研究的金属离子分离。系统地研究了TOTDGA和TEHTDGA萃取Pd（II）的性能。Pd（II）的主要萃合物为Pd（TDGA）_2（NO_3）_2。计算了萃取Pd（II）的热力学函数值。
A new three-structurally related thiodiglycolamides (TDGA), namely, N,N,N′,N′-tetra-n-hexyl-thiodiglycolamide (THTDGA), N,N,N′,N′-tetra-2-ethylhexyl-thiodiglycolamide (TEHTDGA), and N,N,N′,N′-tetra-n-octyl-thiodiglycolamide (TOTDGA) have been synthesized and studied for their extraction behavior towards Pd(II), Pt(IV), Rh(III), Cu(II), Ni(II), and Fe(III) from nitric acid medium. The structure reactivity relationship with extraction of investigated metal ions is studied. The synthesized thiodiglycolamides showed great extractability and selectivity for palladium than the other investigated metal ions. Pd(II) was found to be easily separated from other investigated metal ions in a single extraction step. A systematic investigation has been carried out on the extraction of Pd(II) using both TOTDGA and TEHTDGA. The main extracted species of Pd(II) was found to be Pd(TDGA)2(NO3)2, and IR spectra of the extracted species have been also investigated. The values of thermodynamics functions for the extraction of Pd(II) were calculated.