Selective adsorption of gadolinium from real leachate using a natural bentonite clay

dc.creatorDotto, Guilherme Luiz
dc.creatorVieillard, Julien
dc.creatorPinto, Diana
dc.creatorLütke, Sabrina F.
dc.creatorSilva Oliveira, Luis Felipe
dc.creatordos Reis, Glaydson S.
dc.creatorLima, Éder C.
dc.creatorFranco, Dison S.P.
dc.date2023-09-11T18:59:14Z
dc.date2025
dc.date2023-09-11T18:59:14Z
dc.date2023
dc.date.accessioned2023-10-03T19:28:15Z
dc.date.available2023-10-03T19:28:15Z
dc.identifierGuilherme L. Dotto, Julien Vieillard, Diana Pinto, Sabrina F. Lütke, Luis F.O. Silva, Glaydson S. dos Reis, Éder C. Lima, Dison S.P. Franco, Selective adsorption of gadolinium from real leachate using a natural bentonite clay, Journal of Environmental Chemical Engineering, Volume 11, Issue 3, 2023, 109748, ISSN 2213-3437, https://doi.org/10.1016/j.jece.2023.109748.
dc.identifierhttps://hdl.handle.net/11323/10473
dc.identifier10.1016/j.jece.2023.109748
dc.identifier2213-3437
dc.identifierCorporación Universidad de la Costa
dc.identifierREDICUC - Repositorio CUC
dc.identifierhttps://repositorio.cuc.edu.co/
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/9170254
dc.descriptionThis article investigated the recovery of Gd3+ from real leachate of phosphogypsum (PG) using natural bentonite clay. Firstly, a detailed adsorption study was performed using synthetic Gd3+ solutions. Then, it was investigated the clay performance in the real PG leachate. The characterization results indicate classical bentonite characteristics, such as rugosity and an SBET 91.3 m² g−1, with meso (Dp =3.82 nm) and macroporous (Dp =52.6 nm). In addition, it was identified that the major functional groups are hydroxyl and silicate, with the presence of organic matter. The initial pH solution effect indicates that the optimum removal of Gd3+ is at pH (6), attributing to the pHpzc being at 5.75 and the negatively charged surface above the pHpzc. The Avrami fractional order model was the most suitable for describing the experimental kinetic data. The Langmuir was the proper model for describing the adsorption isotherms, indicating that the Gd3+ forms a monolayer at the surface of the bentonite. The maximum adsorption capacity at pH 6.0 was 121.5 mg g−1. The thermodynamic parameters indicate that the adsorption is spontaneous, with a standard enthalpy change of − 92.30 kJ mol−1, indicating an ionic exchange, where the Gd3+ tends to be organized at the surface, according to the standard entropy change of − 206.0 J K−1 mol−1. The fixed bed adsorption test showed that Gd3+ could be adsorbed for up to 200 min without regeneration. Regeneration results show that the citric acid is more efficient in desorbing the Gd3+ from the bentonite, reaching up to 8 cycles without efficiency loss. Finally, the bentonite clay could selectively recover Gd3+ from the real PG leachate.
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dc.languageeng
dc.publisherElsevier BV
dc.publisherUnited Kingdom
dc.relationJournal of Environmental Chemical Engineering
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dc.rightsAtribución-NoComercial-SinDerivadas 4.0 Internacional (CC BY-NC-ND 4.0)
dc.rightshttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.rightsinfo:eu-repo/semantics/embargoedAccess
dc.rightshttp://purl.org/coar/access_right/c_f1cf
dc.sourcehttps://www.sciencedirect.com/science/article/abs/pii/S2213343723004876
dc.subjectGadolinium
dc.subjectLeachate
dc.subjectNatural bentonite clay
dc.titleSelective adsorption of gadolinium from real leachate using a natural bentonite clay
dc.typeArtículo de revista
dc.typehttp://purl.org/coar/resource_type/c_2df8fbb1
dc.typeText
dc.typeinfo:eu-repo/semantics/article
dc.typehttp://purl.org/redcol/resource_type/ART
dc.typeinfo:eu-repo/semantics/draft
dc.typehttp://purl.org/coar/version/c_b1a7d7d4d402bcce


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