Can contaminated waters or wastewater be alternative sources for technology-critical elements? The case of removal and recovery of lanthanides
authors Afonso, EL; Carvalho, L; Fateixa, S; Amorim, CO; Amaral, VS; Vale, C; Pereira, E; Silva, CM; Trindade, T; Lopes, CB
nationality International
journal JOURNAL OF HAZARDOUS MATERIALS
author keywords Lanthanum; Europium; Terbium; Adsorption; Graphite nanoplatelets; Magnetite nanoparticles
keywords RARE-EARTH-ELEMENTS; MUNICIPAL SOLID-WASTE; GRAPHITE NANOPLATELETS; MAGNETITE PARTICLES; RHINE RIVER; NANOCOMPOSITES; ADSORPTION; COMPOSITE; INCINERATORS; FABRICATION
abstract Technology critical elements (TCE) are considered the vitamins of nowadays technology. Factors such as high demand, limited sources and geopolitical pressures, mining exploitation and its negative impact, point these elements as new emerging contaminants and highlight the importance for removal and recycling TCE from contaminated waters. This paper reports the synthesis, characterization and application of hybrid nanostructures to remove and recover lanthanides from water, promoting the recycling of these high value elements. The nanocomposite combines the interesting properties of graphite nanoplatelets, with the magnetic properties of magnetite, and exhibits good sorption properties towards La(III), Eu(III) and Tb(III). The sorption process was very sensitive to solution pH, evidencing that electrostatic interactions are the main binding mechanism involved. Removal efficiencies up to 80% were achieved at pH 8, using only 50 mg/L of nanocomposite. In ternary solution, occurred a preferential removal of Eu(III) and Tb(III). The equilibrium evidenced a rare but interesting behaviour, and as a proof-of-concept the recoveries and reutilization rates, at consecutive cycles, highlight the recyclability of the composite without loss of efficiency. This study evidences that surface charge and the number of active sites of the composite controls the removal process, providing new insights on the interactions between lanthanoids and magnetic-graphite-nanoplatelets.
publisher ELSEVIER
issn 0304-3894
year published 2019
volume 380
digital object identifier (doi) 10.1016/j.jhazmat.2019.120845
web of science category Engineering, Environmental; Environmental Sciences
subject category Engineering; Environmental Sciences & Ecology
unique article identifier WOS:000491683300035
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journal analysis (jcr 2017):
journal impact factor 6.434
5 year journal impact factor 6.513
category normalized journal impact factor percentile 92.917
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