Journal
NANOMATERIALS
Volume 9, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/nano9101372
Keywords
dysprosium; activated carbon; spent coffee ground; adsorption
Categories
Funding
- European Union [776851]
- H2020 Societal Challenges Programme [776851] Funding Source: H2020 Societal Challenges Programme
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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 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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