Separation Of Divalent Metal Ions Using
Pandanus Amaryllifolius Roxb (Pandanus)
Leaves: Desorption Study
Author(s)
M. Z. Abdullah & K. P. Loo
Abstract
Desorption by dead biomass has been studied on Pandanus Amaryllifolius Roxb
(Pandanus leaves) by conducting batch experiments. The recovery of heavy
metals such as lead and copper ions from biomass was examined using a variety
of desorbing chemicals. This study aims to discover the best chemical which is
able to leach the metal effectively with highest desorbing capacity. The results
showed that HCl at pH 2 and 3.0mM EDTA at pH 4.58 were effective in
desorbing the copper and lead ions from the biomass. The recovery of copper is
very feasible since over 90% of copper was removed from the biomass. The
percentage of lead recovery is about 70%. In contrast, Na2CO3 and NaOH are
not effective in desorbing both of the metals. The results indicated that low pH
is preferable for desorbing the metal ions. The binding ability of HCl is
explained using ion-exchanging principle. More concentrated protons are able to
replace those ions thus regenerating the biomass. EDTA is functioning as
polydentate ligands, which appear to grasp the metal between the six donor
atoms. It was suggested that recovery of metal ions is mainly due to the strength
of bonding between the fraction of functional group of biomass and metal ions.
Recovery of the deposited metals can be accomplished because they can be
released from the saturated biomass in a concentrated wash solution, which also
regenerates the biomass for reuse. Desorbing chemicals such as HCl and EDTA
have proved successful for desorbing the metal ions. Thus, biosorption of heavy
metals by biomass will be emerged as one of the alternative technology in
removing the heavy metals.
Keywords: Pandanus Amaryllifolius Roxb, copper, lead, biosorption,
adsorption, desorption.
Keywords
Pandanus Amaryllifolius Roxb, copper, lead, biosorption,
adsorption, desorption.
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