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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.

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