Recovery of rare earth elements (Nd 3+ and Dy 3+ ) by using carbon-based adsorbents from spent tire rubber.

Autor: Nogueira M; LAQV/REQUIMTE, Departamento of Chemistry, NOVA School of Science and Technology, NOVA University Lisbon, 2829-516, Caparica, Portugal., Matos I; LAQV/REQUIMTE, Departamento of Chemistry, NOVA School of Science and Technology, NOVA University Lisbon, 2829-516, Caparica, Portugal. Electronic address: ines.matos@fct.unl.pt., Bernardo M; LAQV/REQUIMTE, Departamento of Chemistry, NOVA School of Science and Technology, NOVA University Lisbon, 2829-516, Caparica, Portugal. Electronic address: maria.b@fct.unl.pt., Tarelho LAC; Centre for Environmental and Marine Studies, Department of Environment and Planning, University of Aveiro, Aveiro 3810-193, Portugal., Ferraria AM; BSIRG, IBB - Institute for Bioengineering and Biosciences, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, 1049-001, Lisboa, Portugal; Associate Laboratory i4HB-Institute for Health and Bioeconomy at Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais 1049-001, Lisboa, Portugal., Botelho do Rego AM; BSIRG, IBB - Institute for Bioengineering and Biosciences, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, 1049-001, Lisboa, Portugal; Associate Laboratory i4HB-Institute for Health and Bioeconomy at Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais 1049-001, Lisboa, Portugal., Fonseca I; LAQV/REQUIMTE, Departamento of Chemistry, NOVA School of Science and Technology, NOVA University Lisbon, 2829-516, Caparica, Portugal., Lapa N; LAQV/REQUIMTE, Departamento of Chemistry, NOVA School of Science and Technology, NOVA University Lisbon, 2829-516, Caparica, Portugal.
Jazyk: angličtina
Zdroj: Waste management (New York, N.Y.) [Waste Manag] 2024 Feb 15; Vol. 174, pp. 451-461. Date of Electronic Publication: 2023 Dec 19.
DOI: 10.1016/j.wasman.2023.12.025
Abstrakt: Two samples of spent tire rubber (rubber A and rubber B) were submitted to thermochemical conversion by pyrolysis process. A450, B450 and A900, B900 chars were obtained from rubber A and rubber B at 450 °C and 900 °C, respectively. The chars were then applied as recovery agents of Nd 3+ and Dy 3+ from aqueous solutions in mono and bicomponent solutions, and their performance was benchmarked with a commercial activated carbon. The chars obtained at 900 °C were the most efficient adsorbents for both elements with uptake capacities around 30 mg g -1 . The chars obtained at 450 °C presented uptake capacities similar to the commercial carbon (≈ 11 mg g -1 ). A900 and B900 chars presented a higher availability of Zn ions that favored the ion exchange mechanism. It was found that Nd 3+ and Dy 3+ were adsorbed as oxides after Zn was released from silicate structures (Zn 2 SiO 4 ). A900 char was further selected to be tested with Nd/Dy binary mixtures and it was found a trend to adsorb a slightly higher amount of Dy 3+ due to its smaller ionic radius. The uptake capacity in bicomponent solutions was generally higher than for single component solutions due to the higher driving force triggered by the higher concentration gradient.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2023 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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