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Liquid-liquid extraction of metal ions without use of organic solvent

机译:不使用有机溶剂的液-液萃取金属离子

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The extraction behavior of the ions Ni(II), Fe(III), Cd(II), Co(II), Zn(II) and Cu(II) was studied as a function of the amount of extractant added, in aqueous two-phase systems (ATPS) formed mostly by water and without the use of any organic solvent. The others ATPS components were a triblock copolymer (135) and Na2SO4. Two types of water-soluble extractants (thiocyanate, iodide) and one slightly water-soluble extractant [l-nitroso-2-naphthol (1N2N)] were studied separately. It must be emphasized that this is the first study using a slightly water-soluble complexant for the metallic partition in ATPS, which was not a restrictive factor to the technique as believed. The extraction to the 135 rich-phase of all suited metal ions was insignificant without extractant addition. However, the effectiveness of SCN~- in extracting metal ions in the system could be observed in the following sequence: Zn(II)≈Co(II)>Cd(II)>Cu(II)>Fe(III)>Ni(II), with Zn(II), Co(II) and Cd(II) quantitatively extracted and Cu(II) enriched by almost 80%. In the case of the I~- extractant, all metal ions, except Cd(II) and Cu(II), remained in the salt-rich phase, providing favorable conditions to the selective separation of Ni(II), Co(II) and Fe(III) ions from Cd(II). The results show that, at pH 7.2, L35/Na2SO4/H2O ATPS can be used with 1N2N as extractant, to separate Co(II) from a complex mixture containing Fe(III), Zn(II) and Cd(II). It was observed, when using 1N2N, that a significant increase in metal extraction takes place as the pH increases, except for Cd(II) and Zn(II).
机译:研究了Ni(II),Fe(III),Cd(II),Co(II),Zn(II)和Cu(II)离子在两种水溶液中的萃取行为与萃取剂添加量的关系。相系统(ATPS)主要由水形成,而无需使用任何有机溶剂。其他ATPS组分是三嵌段共聚物(135)和Na2SO4。分别研究了两种水溶性萃取剂(硫氰酸盐,碘化物)和一种微水溶性萃取剂[1-亚硝基-2-萘酚(1N2N)]。必须强调的是,这是首次对ATPS中的金属分区使用微水溶性络合剂的研究,这并非所认为的限制技术。在不添加萃取剂的情况下,所有合适的金属离子均被萃取至135富相。但是,可以按以下顺序观察到SCN〜-在系统中提取金属离​​子的有效性:Zn(II)≈Co(II)> Cd(II)> Cu(II)> Fe(III)> Ni( II),定量提取Zn(II),Co(II)和Cd(II),并将Cu(II)富集近80%。对于I-萃取剂,除Cd(II)和Cu(II)外,所有金属离子均保持在富盐相中,这为Ni(II),Co(II)的选择性分离提供了有利条件。以及来自Cd(II)的Fe(III)离子。结果表明,在pH 7.2下,L35 / Na2SO4 / H2O ATPS可以与1N2N一起用作萃取剂,以从含有Fe(III),Zn(II)和Cd(II)的复杂混合物中分离Co(II)。观察到,当使用1N2N时,除Cd(II)和Zn(II)外,随着pH的增加,金属萃取量显着增加。

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