Grupo de Química Verde Coloidal e Macromolecular, Departamento de Química, Centro de Ciências Exatas e Tecnológicas, Universidade Federal de Viçosa, Av. P.H. Rolfs s/n, Viçosa, MG 36560-000, Brazil.
J Chromatogr A. 2013 Mar 1;1279:13-9. doi: 10.1016/j.chroma.2013.01.003. Epub 2013 Jan 10.
This work developed a new and efficient method of extracting and separating Co(II), Ni(II) and Cd(II) in aqueous two-phase systems (ATPS) composed of triblock copolymer (L64)+Na(2)C(4)H(4)O(6)+water and L64+Li(2)SO(4)+water using the hydrophobic extractant 1-nitroso-2-naphtol, which complexes the metal ions and partitions in the triblock copolymer micelles in the ATPS top phase. Metal extraction from the salt-rich phase to the copolymer - rich phase is strongly affected by the fine-tuning of the following parameters: amount of added extractant, type of electrolyte, pH, and tie-line length. Excellent separation factors (S(i,j)) between the metals were obtained at pH=3.00 (S(Co,Cd)=1550 and S(Ni,Cd)=16,700) and pH=1.00 (S(Co,Ni)=826). In the interference study, Co(II) was selectivity extracted in the top phase in the presence of Ni(II) and Cd(II) in a concentration of up to 20 times the cobalt level in the system.
本工作开发了一种新的、有效的方法，用于从由两亲嵌段共聚物（L64）+Na 2 C 4 H 4 O 6 +水和 L64+Li 2 SO 4 +水组成的双水相体系（ATPS）中提取和分离 Co(II)、Ni(II) 和 Cd(II)。该方法使用疏水性萃取剂 1-亚硝基-2-萘酚，它与金属离子络合并分配在 ATPS 上相中两亲嵌段共聚物胶束中。从富盐相到共聚物相的金属萃取强烈受以下参数的精细调整影响：添加的萃取剂的量、电解质的类型、pH 值和连接线长度。在 pH=3.00 时（S(Co,Cd)=1550 和 S(Ni,Cd)=16,700）和 pH=1.00 时（S(Co,Ni)=826），获得了金属之间极好的分离因子（S(i,j)）。在干扰研究中，在存在 Ni(II)和 Cd(II)的情况下，Co(II)在浓度高达体系中钴水平 20 倍的情况下仍选择性地在上相中萃取。
