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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472 EISSN: 1735-1472
Vol. 13, No. 8, 2016, pp. 1989-2000
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Bioline Code: st16182
Full paper language: English
Document type: Research Article
Document available free of charge
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International Journal of Environment Science and Technology, Vol. 13, No. 8, 2016, pp. 1989-2000
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High efficacy on diclofenac removal by activated carbon produced from potato peel waste
Bernardo, M.; Rodrigues, S.; Lapa, N.; Matos, I.; Lemos, F.; Batista, M. K. S.; Carvalho, A. P. & Fonseca, I.
Abstract
In the present study, a novel porous carbon
obtained by K2CO3 activation of potato peel waste under
optimized conditions was applied for the first time as liquid-phase adsorbent of sodium diclofenac in parallel with a
commercial activated carbon. The biomass-activated carbon presented an apparent surface area of 866 m2 g-1 and
well-developed microporous structure with a large amount
of ultramicropores. The obtained carbon presented leaching
and ecotoxicological properties compatible with its safe
application to aqueous medium. Kinetic data of laboratorymade and commercial sample were best fitted by the
pseudo-second-order model. The commercial carbon presented higher uptake of diclofenac, but the biomass carbon
presented the higher adsorption rate which was associated
with its higher hydrophilic nature which favoured external
mass transfer. Both adsorbents presented adsorption isotherms that were best fitted by Langmuir model. The
biomass carbon and the commercial carbon presented
adsorption monolayer capacities of 69 and 146 mg g-1,
and Langmuir constants of 0.38 and 1.02 L mg-1,
respectively. The better performance of the commercial
sample was related to its slightly higher micropore volume,
but the most remarkable effect was the competition of
water molecules in the biomass carbon.
Keywords
Activated carbon; Adsorption; Diclofenac; Potato peel wastes
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