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Open AccessArticle

Dysprosium Removal from Water Using Active Carbons Obtained from Spent Coffee Ground

1
National Center for Metallurgical Research (CENIM), Spanish National Research Council (CSIC), Avda. Gregorio del Amo, 8, 28040 Madrid, Spain
2
Department of Materials Physics, Faculty of Physics, Complutense University of Madrid, s/n, 28040 Madrid, Spain
*
Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(10), 1372; https://doi.org/10.3390/nano9101372
Received: 5 August 2019 / Revised: 9 September 2019 / Accepted: 19 September 2019 / Published: 25 September 2019
This paper describes the physicochemical study of the adsorption of dysprosium (Dy3+) 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 m2·g−1 and pores with a diameter of 3.2 nm. Carbon activated with water vapor and N2 is a solid mesoporous, with pores of 5.7 nm in diameter and a specific surface of 982 m2·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. View Full-Text
Keywords: dysprosium; activated carbon; spent coffee ground; adsorption dysprosium; activated carbon; spent coffee ground; adsorption
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MDPI and ACS Style

Alcaraz, L.; Escudero, M.E.; Alguacil, F.J.; Llorente, I.; Urbieta, A.; Fernández, P.; López, F.A. Dysprosium Removal from Water Using Active Carbons Obtained from Spent Coffee Ground. Nanomaterials 2019, 9, 1372.

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