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Advisor(s)
Abstract(s)
This study is focused on the synthesis and application of glycerol-based carbon materials (GBCM200,
GBCM300 and GBCM350) as adsorbents for the removal of the antibiotic compounds flumequine and tetracycline
from aqueous solution. The synthesis enrolled the partial carbonization of a glycerol-sulfuric acid
mixture, followed by thermal treatments under inert conditions and further thermal activation under
oxidative atmosphere. The textural properties were investigated through N2 adsorption–desorption
isotherms, and the presence of oxygenated groups was discussed based on zeta potential and Fourier
transform infrared (FTIR) data. The kinetic data revealed that the equilibrium time for flumequine
adsorption was achieved within 96 h, while for tetracycline, it was reached after 120 h. Several kinetic
models, i.e., pseudo-first order, pseudo-second order, fractional power, Elovich and Weber–Morris
models, were applied, finding that the pseudo-second order model was the most suitable for the fitting
of the experimental kinetic data. The estimated surface diffusion coefficient values, Ds, of 3.88 and
5.06 10 14 m2 s 1, suggests that the pore diffusion is the rate limiting step of the adsorption process.
Finally, as it is based on SSE values, Sips model well-fitted the experimental FLQ and TCN adsorption isotherm
data, followed by Freundlich equation. The maximum adsorption capacities for flumequine and
tetracycline was of 41.5 and 58.2 mg g 1 by GBCM350 activated carbon.
Description
Keywords
Adsorption Antibiotics Carbon materials Ememrging contaminants
Citation
Álvarez-Torrellas, S.; Ribeiro, R.S.; Gomes, Helder; Ovejero, G.; García, J. (2016). Removal of antibiotic compounds by adsorption using glycerol-based carbon materials. Chemical Engineering Journal. ISSN 1385-8947. 296, p. 277-288