Removal and recovery of Rare-Earth Elements from fluorescent lamp waste using marine macroalgae

Financiador

Organização

Publicações

Neodymium removal and recovery from simulated NdFeB leachate using manganese ferrite nanoparticles

Publication . Sousa, Joana; Tavares, Daniela S.; Pinto, João; Henriques, Bruno; Rocha, João; Trindade, Tito; Lapa, Nuno; Pereira, Eduarda; DQ - Departamento de Química; LAQV@REQUIMTE; Elsevier

This study explores the use of manganese ferrite nanoparticles (MnFe2O4) for the removal and recovery of neodymium (Nd) from aqueous solutions, focusing on their potential application in wastewater treatment and environmental remediation. Neodymium, a critical element for the high-technology and energy industries, is increasingly present in aquatic environments due to its widespread use in devices such as computers, electric vehicles, and wind turbines. Through a series of kinetic, equilibrium, and desorption tests, the study optimized key operational parameters using Response Surface Methodology. Equilibrium analyses revealed that the Nd removal at equilibrium (qe) reached 8 mg/g, while the maximum sorption capacity (qm) was determined to be 9.2 mg/g. The results demonstrated a high removal efficiency (up to 90 %) under optimal conditions, which included a nanoparticle dose of 1000 mg/L, an initial neodymium concentration of 20 μmol/L, pH 6, and no salinity. The material showed great potential for neodymium recovery from synthetic magnet solutions, with removal rates exceeding 70 %. Desorption tests confirmed complete recyclability of the sorbent. These findings highlight manganese ferrite nanoparticles as a promising and sustainable approach for neodymium recovery.

2025-03Artigo científico

Acesso aberto

Ver mais

Entidade financiadora

Fundação para a Ciência e a Tecnologia

Programa de financiamento

POR_CENTRO

Número da atribuição

2020.05323.BD