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Título:
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Dysprosium removal from water using active carbons obtained from spent coffee ground
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Autores:
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Alcaraz, Lorena ;
Escudero, María Esther ;
Alguacil, Francisco José ;
Llorente, Irene ;
Urbieta Quiroga, Ana Irene ;
Fernández Sánchez, Paloma ;
López, Félix Antonio
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Tipo de documento:
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texto impreso
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Editorial:
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MDPI, 2019-10
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Dimensiones:
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application/pdf
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Nota general:
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cc_by
info:eu-repo/semantics/openAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Física: Física de materiales
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Materia = Ciencias: Física: Física del estado sólido
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Tipo = Artículo
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Resumen:
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This paper describes the physicochemical study of the adsorption of dysprosium (Dy^(3+)) in aqueous solution onto two types of activated carbons synthesized from spent coffee ground. Potassium hydroxide (KOH)-activated carbon is a microporous material with a specific Brunauer-Emmett-Teller (BET) surface area of 2330 m^2.g^-1 and pores with a diameter of 3.2 nm. Carbon activated with water vapor and N_2 is a solid mesoporous, with pores of 5.7 nm in diameter and a specific surface of 982 m^2.g^-1. A significant dependence of the adsorption capacity on the solution pH was found, but it does not significantly depend on the dysprosium concentration nor on the temperature. A maximum adsorption capacity of 31.26 mg.g^-1 and 33.52 mg.g^-1 for the chemically and physically activated carbons, respectively, were found. In both cases, the results obtained from adsorption isotherms and kinetic study were better a fit to the Langmuir model and pseudo-second-order kinetics. In addition, thermodynamic results indicate that dysprosium adsorption onto both activated carbons is an exothermic, spontaneous, and favorable process.
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En línea:
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https://eprints.ucm.es/id/eprint/58101/1/FS%C3%A1nchez%20P%2007%20LIBRE%2BCC.pdf
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