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Open AccessArticle

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

National Center for Metallurgical Research (CENIM), Spanish National Research Council (CSIC), Avda. Gregorio del Amo, 8, 28040 Madrid, Spain
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;
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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