KAJIAN AWAL PENJERAPAN ASID HUMIK KE ATAS MANIK KITOSAN DAN MANIK KITOSAN-GLUTERALDEHID
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Date
2004-03
Authors
ABDULLAH, NORAZAH
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Abstract
The adsorption of humic acid onto chitosan and cross-linked chitosan beads
with gluteraldehyde (chitosan-GLA beads) has been investigated. The chitosan beads
are cross-linked to obtain a sorbent that is insoluble and has low swelling pencentage
in acidic medium. The chitosan and chitosan-GLA beads are characterized using
fourier transform infrared spectrometer (FTIR). The uptake of humic acid from
aqueous solution is determined from the changes in absorbance measured using uv-vis
spectrometer. The optimum parameters are determined to measure the adsorption
capacity. The optimum pH for both sorbents are at pH 4.0. Whereas agitation period
and rotation speed have no effect on adsorption of humic acid. However, the agitation
period is fixed at 30 minutes with rotation speed of 480 rpm. The different shape of
isotherm for both chitosan and chitosan-GLA beads are studied. Two models are used
to determine the maximum adsorption capacity. The models are Langmuir and
Freundlich. The adsorption data of the chitosan beads correlate well with the
Freundlich compares with Langmuir isotherm equation. However, the chitosan-GLA
beads does not correlate any of the two models. Chitosan beads has better uptake
capacity for the humic acid as <?ompare with chitosan-GLA beads. The humic acid
adsorption ,.c apacity onto chitosan bead calculated from the Freundlich isotherm is
2.96 mg/g. Finally, the relative standard deviation (RSD) is small, 2.6 and 0.1 % for
chitosan and chitosan-GLA beads respectively. This shows that the experiment has a
good reproducibility.
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Keywords
PENJERAPAN ASID , KITOSAN-GLUTERALDEHID