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• W3128761707 endingPage "6813" @default.
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• W3128761707 abstract "In this work, Ca-montmorillonite (STx), natural and modified (STx-L6) with a linear penta-ethylene-hexamine (L6), were tested as sorbents in a liquid/solid process for La and Cu capture in bionic model solutions. Twelve La/Cu ratios in solution were set and analyzed with the final target of investigating the capture mechanisms when both Cu and La are present. The liquid phase was characterized via inductively coupled plasma-optical emission spectroscopy (ICP-OES), while the solids were studied by means of X-ray powder diffraction (XRPD). No direct competition between Cu and La ions for the capture sites was found but rather the modification of the acid–base condition of the solution and the related equilibria due to aquo- and hydroxy-copper complexes formation. Cu complexes are responsible for pH modification and the related influence on the capture of La ions. Three distinct mechanisms were identified to be active in the capture process, i.e., ion exchange, surface adsorption, and coordination of the metal by the polyamine, when present. Only La is involved in the ionic exchange process, since no Cu was captured by pristine clays, while only Cu is coordinated to the polyamine, in view of its preferential interaction with amino groups. The different capture mechanisms are responsible for the higher efficiency of the organoclay, with respect to the pristine one. This study lays the groundwork for the development of an efficient method for rare earths (REs) and precious metal recovery from waste electrical and electronical equipment (WEEE) by a liquid/solid process." @default.
• W3128761707 created "2021-02-15" @default.
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• W3128761707 date "2021-02-02" @default.
• W3128761707 modified "2023-10-18" @default.
• W3128761707 title "Capture Mechanism of La and Cu Ions in Mixed Solutions by Clay and Organoclay" @default.
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• W3128761707 doi "https://doi.org/10.1021/acs.iecr.0c05333" @default.
• W3128761707 hasPublicationYear "2021" @default.
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