Carbon-based materials prepared from pine gasification residues for acetaminophen adsorption

Galhetas, M.; Mestre, A. S.; Pinto, Moisés L.; Gulyurtlu, Ibrahim; Lopes, Helena; Carvalho, A. P.

http://hdl.handle.net/10400.9/2495

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Abstract(s)

Fly ash, a residue produced frompine gasification,was used as precursor of carbon-basedmaterials assayed in acetaminophen adsorption. Materials prepared by activation with K2CO3, presented high porosity development (ABET 1200m2 g1) and samples calcined at 900 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 samplesmonolayer adsorption capacities attained values similar to those of commercial carbons. The influence of themicropore 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 surfacewas demonstrated. The increase of temperature lead to highermonolayer adsorption capacities, most likely due to the easier accessibility of the acetaminophen species to the narrowest micropores.

Keywords

Pine gasification Ashes Carbon materials Micropore size distribution Acetaminophen adsorption

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http://hdl.handle.net/10400.9/2495

Citation

Galhetas, M.; Mestre, A.S.; Pinto, M.L.; Gulyurtlu, I.; Lopes, H.; Carvalho, A.P. Carbon-based materials prepared from pine gasification residues for acetaminophen adsorption. In: Chemical Engineering Journal, 2014, Vol. 240, p. 344-351