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

Nanomaterials

卷:9

Ana Urbieta¹  Paloma Fernández¹  FélixAntonio López²  FranciscoJosé Alguacil²  Lorena Alcaraz²  Irene Llorente²  MaríaEsther Escudero² 

[1] Department of Materials Physics, Faculty of Physics, Complutense University of Madrid, s/n, 28040 Madrid, Spain;

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

关键词: dysprosium;    activated carbon;    spent coffee ground;    adsorption;   

DOI  :  10.3390/nano9101372

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown