Carbon-based materials prepared from pine gasification residues for acetaminophen adsorption
authors Galhetas, M; Mestre, AS; Pinto, ML; Gulyurtlu, I; Lopes, H; Carvalho, AP
nationality International
journal CHEMICAL ENGINEERING JOURNAL
author keywords Pine gasification; Fly ash; Carbon materials; Micropore size distribution; Acetaminophen adsorption
keywords ACTIVATED CARBONS; PHYSICAL ACTIVATION; SURFACE-CHEMISTRY; AQUEOUS-SOLUTIONS; FLY-ASH; IBUPROFEN; REMOVAL; WASTE; SORPTION; GASES
abstract Fly ash, a residue produced from pine gasification, was used as precursor of carbon-based materials assayed in acetaminophen adsorption. Materials prepared by activation with K2CO3, presented high porosity development (A(BET) approximate to 1200 m(2) g(-1)) and samples calcined at 900 degrees C presented high volumes of large micropores and mesopores. Kinetic and equilibrium acetaminophen adsorption data showed that the process obeys to the pseudo-second order kinetic equation and Langmuir model, respectively. The rate of acetaminophen adsorption depends of the presence of larger micropores. For the lab-made samples monolayer adsorption capacities attained values similar to those of commercial carbons. The influence of the micropore size distribution of the carbons in the acetaminophen adsorption process justified the lower adsorption affinities of the lab-made carbons. The importance of pores of a specific dimension (0.7 nm) to enhance the affinity of the molecule towards the carbon surface was demonstrated. The increase of temperature lead to higher monolayer adsorption capacities, most likely due to the easier accessibility of the acetaminophen species to the narrowest micropores. (C) 2013 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE SA
issn 1385-8947
year published 2014
volume 240
beginning page 344
ending page 351
digital object identifier (doi) 10.1016/j.cej.2013.11.067
web of science category Engineering, Environmental; Engineering, Chemical
subject category Engineering
unique article identifier WOS:000331782500040
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