期刊
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
卷 127, 期 -, 页码 141-150出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.psep.2019.05.011
关键词
Polymeric nanofibers; Solid-phase extraction; Indium; Centrifugal spinning; Wastes recycling
资金
- Fundacao de Amparo a Pesquisa do Estado do Rio Grande do Sul (FAPERGS)
- Conselho Nacional de Desenvolvimento Cientifico a Tecnologico (CNPq)
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
- Secretaria do Desenvolvimento Economico, Ciencia e Tecnologia do Estado do Rio Grande do Sul (SDECT)
The main objective of this work was to develop a nanomaterial able to selectively extract and recover indium (In) from obsolete cell phone LCD screens. For this, Nylon 6 nanofibers were produced and modified with di-(2-ethylhexyl)phosphoric acid (DEHPA) for application in the solid-phase extraction of In. The best extraction conditions for concentration of In were 30% DEHPA, pH 0.5, 7.5 min contact time, and S:L ratio of 1:300. In this step, an In extraction efficiency of around 74% was obtained. In stripping steps, an efficiency of 92% was achieved using 1.5 M HCI, S:L ratio of 1:20, and 5 min contact time. Under the best extraction and stripping conditions, it was possible to obtain up to 6-fold concentration of In, compared to the initial concentration. In addition, the nanofibers were evaluated in terms of their stability and capacity for reuse, which showed that there was no significant loss of DEHPA and that the extraction efficiency remained almost constant. The findings demonstrated the possibility of using the Nylon 6/DEHPA nanofibers in a highly efficient extraction/stripping procedure for the selective recovery of In and Sn, with reduced environmental impacts. (C) 2019 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
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