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¹Grupo 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.

Journal of Hazardous Materials

|September 11, 2012

Summary

This study demonstrates effective copper(II) extraction using aqueous two-phase systems (ATPS) with 1-(2-pyridylazo)-2-naphthol (PAN). High separation factors were achieved, enabling efficient copper recovery from leached ore concentrates.

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Area of Science:

Analytical Chemistry
Separation Science
Hydrometallurgy

Background:

Aqueous two-phase systems (ATPS) offer environmentally friendly separation methods.
Efficient extraction of copper(II) is crucial for recycling and industrial processes.
1-(2-pyridylazo)-2-naphthol (PAN) is a known chelating agent for metal ions.

Purpose of the Study:

To investigate the extraction behavior of copper(II) using L35-based ATPS.
To evaluate the efficacy of PAN as an extracting agent in these systems.
To determine the selectivity of the ATPS for copper(II) over other metal ions.

Main Methods:

Formation of ATPS using L35 with MgSO(4) or (NH(4))(2)SO(4) in aqueous solutions.
Extraction of Cu(II) in the presence of 1-(2-pyridylazo)-2-naphthol (PAN).
Analysis of metal ion separation using high separation factors at pH=3 and specific PAN concentration.

Main Results:

Both L35+MgSO(4)+H(2)O and L35+(NH(4))(2)SO(4)+H(2)O ATPS effectively separated Cu(II) from Zn(II), Co(II), Ni(II), and Fe(III).
High separation factors (1000–10,000) were achieved for Cu(II) extraction.
Extraction of Cu(II) from leached ore concentrate yielded a 90.4 ± 1.1% recovery, with other metals remaining in the bottom phase.

Conclusions:

L35-based ATPS in conjunction with PAN provides a highly selective method for Cu(II) extraction.
The developed system demonstrates significant potential for copper recovery from complex matrices like leached ores.
This ATPS approach offers an efficient and selective alternative for hydrometallurgical applications.