University of Oulu

Dos Reis, G. S., Dotto, G. L., Vieillard, J., Oliveira, M. L. S., Lütke, S. F., Grimm, A., Silva, L. F. O., Lima, É. C., Naushad, Mu., & Lassi, U. (2023). Nickel-aluminium layered double hydroxide as an efficient adsorbent to selectively recover praseodymium and samarium from phosphogypsum leachate. Journal of Alloys and Compounds, 960, 170530.

Nickel-aluminium layered double hydroxide as an efficient adsorbent to selectively recover praseodymium and samarium from phosphogypsum leachate

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Author: dos Reis, Glaydson S.1; Dotto, Guilherme L.2,3; Vieillard, Julien3;
Organizations: 1Department of Forest Biomaterials and Technology, Biomass Technology Centre, Swedish University of Agricultural Sciences, Umeå SE-901 83, Sweden
2Research Group on Adsorptive and Catalytic Process Engineering (ENGEPAC), Federal University of Santa Maria, Av. Roraima, 1000-7, 97105-900 Santa Maria, RS, Brazil
3Normandie Université, UNIROUEN, INSA Rouen, CNRS, COBRA (UMR 6014), 27000 Evreux, France
4Universidad De La Costa, Calle 58 # 55-66, 080002 Barranquilla, Atlántico, Colombia
5Institute of Chemistry, Federal University of Rio Grande do Sul–UFRGS, Av. Bento Gonçalves 9500, P.O. Box 15003, 91501-970 Porto Alegre, RS, Brazil
6Department of Chemistry, College of Science, Building #5, King Saud University, Riyadh, Saudi Arabia
7Research Unit of Sustainable Chemistry, University of Oulu, P.O. Box 3000, FI-90014 Oulu, Finland
8Unit of Applied Chemistry, University of Jyvaskyla, Kokkola University Consortium Chydenius, Talonpojankatu 2B, FI-67100 Kokkola, Finland
Format: article
Version: accepted version
Access: embargoed
Persistent link:
Language: English
Published: Elsevier, 2023
Publish Date: 2025-05-11


This study aimed to synthesize a green powdered layered double hydroxide (LDH) based on nickel-aluminum (Ni–Al-LDH) to evaluate its efficiency in the removal of rare earth elements (REEs), Praseodymium (Pr3+) and Samarium (Sm3+), from synthetic effluents and real leachate using phosphogypsum as a secondary source of REEs. Several characterization techniques were employed to evaluate the physicochemical properties of Ni-Al-LDH adsorbent, such as specific surface area and porosity, functional surface groups and phases, and point of zero charge. The characterization results indicated that Ni-Al-LDH exhibited a typical layered structure confirming the successful synthesis. The effect of key adsorption variables, such as pH, contact time, initial concentration, and temperature, on the REEs adsorption was extensively studied in single-factor experiments separately. The kinetic and equilibrium adsorption data agreeably fitted the Avrami and Sips models, respectively. The maximum adsorption capacities for Pr3+ and Sm3+ adsorption were 18.13 and 15.68 mg g−1 at 298 K, respectively. The thermodynamic parameters (ΔH0, ΔS0, ΔG0) indicated that the adsorption was spontaneous, favorable, and exothermic for both Pr3+ and Sm3+. The interactions between Pr33+ and Sm3+ onto Ni-Al-LDH suggest that multiple adsorption mechanisms are involved, such as ion exchange, precipitation, chelation, and pore filling. Finally, the Ni-Al-LDH could selectively recover REEs, specially Pr3+ and Sm3+, from the real phosphogypsum leachate. It has been demonstrated that Ni-Al-LDH is a promising adsorbent material that could be used as an adsorbent for the recovery of REEs from synthetic and real effluents.

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Series: Journal of alloys and compounds
ISSN: 0925-8388
ISSN-E: 1873-4669
ISSN-L: 0925-8388
Volume: 960
Article number: 170530
DOI: 10.1016/j.jallcom.2023.170530
Type of Publication: A1 Journal article – refereed
Field of Science: 116 Chemical sciences
Funding: Dr. dos Reis thanks Bio4Energy— a Strategic Research Environment appointed by the Swedish government and the Swedish University of Agricultural Sciences, for the funding support. This work was funded by Brazilian National Council for Scientific and Technological Development/CNPq (Grants 405.982/2022-4, 303.992/2021-2, 303.612/2021-5, and 402.450/2021-3) and Coordination for the Improvement of Higher Education Personnel/CAPES (CAPES-PRINT Program). Dr. Alejandro Grimm acknowledges financial support from the Swedish Research Council FORMAS (2021-00877). The authors are also grateful to the Researchers Supporting Project number (RSP2023R8), King Saudi University, Riyadh, Saudi Arabia, for the financial support.
Copyright information: © 2023. This manuscript version is made available under the CC-BY-NC-ND 4.0 license