Please use this identifier to cite or link to this item: http://www.repositorio.ufop.br/handle/123456789/11169
Title: Selective separation of Cu, Ni and Ag from printed circuit board waste using an environmentally safe technique.
Authors: Souza, Wagner Barbosa de
Abreu, Christian Silva
Rodrigues, Guilherme Dias
Mageste, Aparecida Barbosa
Lemos, Leandro Rodrigues de
Keywords: Aqueous two-phase systems
Green chemistry
Ion separation
Electronic hazardous waste
Issue Date: 2018
Citation: SOUZA, W. B. de et al. Selective separation of Cu, Ni and Ag from printed circuit board waste using an environmentally safe technique. Journal of Environmental Management, v. 226, p. 76-82, nov. 2018. Disponível em: <https://www.sciencedirect.com/science/article/pii/S0301479718309204>. Acesso em: 7 mar. 2019.
Abstract: Printed circuit boards (PCBs) make up a large part of e-waste and include high concentrations of high-value metals. Therefore, the recovery of these metals is interesting from both the environmental and economic points of view. Here, the extraction/separation of copper, nickel and silver from PCB leachate was studied using an aqueous two-phase system (ATPS) formed by triblock copolymers with an electrolyte and water, which is in compliance with the principles of green chemistry. The best conditions for the selective extraction consisted of 1-(2-pyridylazo)-2-naphthol (3.5 mmol kg−1) at pH = 6.0 in 6 sequential steps for the Cu(II), dimethylglyoxime (5.00 mmol kg−1) at pH = 9.0 for the Ni(II) and thiocyanate (5.20 mmol kg−1) at pH = 9.0 for the Ag(I). These conditions were applied sequentially for extraction of Cu, Ni and Ag from the PCB leachate, obtaining high separation factor (S) values between the analyte and the metallic concomitants (SCu,Ni = 1,460, SCu,Fe = 15,500, SCu,Ag = 15,900, SNi,Fe = 32,700, SNi,Ag = 34,700 and SAg,Fe = 4800). The maximum extraction percentages (%E) for Cu, Ni and Ag were 99.9%, 99.9% and 99.8%, respectively. After the extraction, a single step stripping process was performed, resulting in more than 82% of the ion available in a clean lower phase. For the first time, an ATPS has been used for sequential extraction of several metal analytes from a real sample.
URI: http://www.repositorio.ufop.br/handle/123456789/11169
metadata.dc.identifier.uri2: https://www.sciencedirect.com/science/article/pii/S0301479718309204
metadata.dc.identifier.doi: https://doi.org/10.1016/j.jenvman.2018.08.049
ISSN: 0301-4797
Appears in Collections:DEQUI - Artigos publicados em periódicos

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