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Dysprosium removal from water using active carbons obtained from spent coffee ground

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Alcaraz, Lorena and Escudero, María Esther and Alguacil, Francisco José and Llorente, Irene and Urbieta Quiroga, Ana Irene and Fernández Sánchez, Paloma and López, Félix Antonio (2019) Dysprosium removal from water using active carbons obtained from spent coffee ground. Nanomaterials, 9 (10). ISSN 2079-4991

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Official URL: http://dx.doi.org/10.3390/nano9101372


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Abstract

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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© 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).

Uncontrolled Keywords:Luminescence characteristics; Adsorption; Ions; Waste; Adsorbent; dysprosium; Activated carbon; Spent coffee ground
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:58101
Deposited On:10 Jan 2020 15:54
Last Modified:13 Jan 2020 09:02

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