Adsorption Of Cu(Ii) And Ni(Ii) Ions Using Chitosan-Benzaldehyde Beads
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Date
2016-05
Authors
Law, Shun Chin
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Abstract
Two types of chitosan derivatives, chitosan-benzaldehyde 1:1 and 1:2 beads
were prepared and used to adsorb Cu2+ and Ni2+ ions from aqueous solution. The
beads were characterized using infrared spectroscopy, surface area and pore size
analysis and scanning electron microscope coupled with energy dispersive X-ray
(SEM-EDX) analysis. The surface charge of the chitosan-benzaldehyde beads was
determined by using pHpzc. Batch adsorption studies were carried out to investigate
the optimum conditions for the removal of Cu2+ and Ni2+ ions using chitosanbenzaldehye
beads for further adsorption studies. Based on thermodynamic studies,
the standard enthalpy change (ΔH°) for all the adsorbents were positive indicating an
endothermic process. The adsorption of Cu2+ and Ni2+ ions by using chitosanbenzaldehye
beads were best described by pseudo-second order kinetic model. The
experimental data were best fitted by Freundlich and Redlich-Peterson isotherm
model for both chitosan-benzaldehyde 1:1 and 1:2 beads. The maximum adsorption
capacity for chitosan-benzaldehyde 1:1 and 1:2 beads were 81.76 and 55.53 mg/g,
respectively for Cu2+ ions and 30.34 and 20.42 mg/g respectively for Ni2+ ions. For
the fixed-bed column studies, the experimental data is well fitted to the both Thomas
and Yoon-Nelson models. The percentage of desorption based on desorption studies
are 92.78 % for Cu2+ ions and 85.74 % for Ni2+ ions when chitosan-benzaldehyde 1:1
beads were used while there was 94.54 % for Cu2+ ions and 81.55 % for Ni2+ ions
when chitosan-benzaldehyde 1:2 beads were used.
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Keywords
The surface charge of the chitosan-benzaldehyde beads , was determined by using pHpzc.