Activated carbon prepared from pomegranate peel microwave assisted koh activation for dyes adsorption
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Date
2013-07-01
Authors
Nur Azreen Ahmad Puad
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Abstract
The production of pomegranate peel based activated carbon (PPAC) through
microwave assisted KOH activation has been successfully investigated. PPAC produced
was used for removal of malachite green (MG) and remazol brilliant blue reactive
(RBBR) dyes from aqueous solution. The PPAC has high surface area of 941.02 m2/g
and demonstrated heterogeneous mesoporous type of pore structure with a presence of
various functional groups on the PPAC’s surface. The effects of adsorbate initial
concentration (50-500 mg/L), contact time (0-24 h), solution temperature (30-60oC) and
solution pH (2-12) were evaluated through batch adsorption test. All dyes adsorption
uptakes increased with increasing temperature, initial dyes concentration and contact
time. Adsorption of MG and RBBR dyes onto PPAC were best fitted by Freundlich
model. Adsorption kinetic of MG and RBBR dyes onto PPAC were best fitted by
pseudo-second-order kinetic model. From the thermodynamic study, the MG and RBBR
adsorption onto PPAC were physically controlled type, spontaneous and endothermic in
nature. From the mechanism study, the adsorption rate was governed by film diffusion
mechanism.