Green separation of copper and zinc using triblock copolymer aqueous two-phase systems

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• 作者：Leandro Rodrigues de Lemos ; Raquel Araú ; jo Campos ; Guilherme Dias Rodrigues ; Luis Henrique Mendes da Silva ; Maria C. Hespanhol da Silva ; ^{mariacarmo@ufv.br}
• 关键词：Aqueous two-phase system ; Green chemistry ; Triblock copolymer ; Liquid&ndash ; liquid extraction
• 刊名：Separation and Purification Technology
• 出版年：2013
• 出版时间：30 August, 2013
• 年：2013
• 卷：115
• 期：Complete
• 页码：107-113
• 全文大小：667 K

文摘

The separation of copper and zinc was studied using aqueous two-phase systems (ATPSs) formed by triblock copolymers (L64), electrolyte (MgSO₄, Li₂SO₄ or Na₂C₄H₄O₆) and water in the presence of 1-(2-pyridylazo)-2-naphthol (PAN) as an extractor. The separation behavior of the metals is affected by the quantity of extractor added, the pH of the system, the nature of the ATPS electrolyte and the system composition. The maximum separation (S_Cu,Zn = 204) of Cu and Zn was obtained with the L64 + Na₂C₄H₄O₆ ATPS at pH 3.0, a tie-line length of 41.28 % (m/m) and a PAN/metal molar ratio of 3.0. For this ATPS system and at the same thermodynamic condition, the copper stripping percentage reached a maximum value ( % S = 83.3 % ) using H₂SO₄ 0.076 mol kg^?1.