RT Journal Article
T1 Dysprosium removal from water using active carbons obtained from spent coffee ground
A1 Alcaraz, Lorena
A1 Escudero, María Esther
A1 Alguacil, Francisco José
A1 Llorente, Irene
A1 Urbieta Quiroga, Ana Irene
A1 Fernández Sánchez, Paloma
A1 López, Félix Antonio
AB 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.
PB MDPI
SN 2079-4991
YR 2019
FD 2019-10
LK https://hdl.handle.net/20.500.14352/13825
UL https://hdl.handle.net/20.500.14352/13825
LA eng
NO © 2019 by the authors. Licensee MDPI.This project has received funding from the European Union's Horizon 2020 research and innovation program under grant agreement No 776851 (carEService).
NO Unión Europea. H2020
DS Docta Complutense
RD 16 may 2024