Impacto
Downloads
Downloads per month over past year
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
Preview |
PDF
Creative Commons Attribution. 4MB |
Official URL: http://dx.doi.org/10.3390/nano9101372
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.
Item Type: | Article |
---|---|
Additional Information: | © 2019 by the authors. Licensee MDPI. |
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 |
Origin of downloads
Repository Staff Only: item control page