Sorption Study of Cd(II) from Aqueous Solution Using Activated Carbon Prepared from Vitellaria paradoxa Shell
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Date
2015-02-14
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OMICS
Abstract
Activated carbon prepared from vitellaria paradoxa (shea nut) shell using otho-phosphoric acid has been used for
the removal of Cd(II) ion from aqueous solution. The adsorbent sample was characterized by some physicochemical
and spectroscopic parameters such as pH, point of zero charge (PZC), moisture content, iodine number, loss on
ignition, bulk density, XRF, SEM and TEM. The pH and the PZC of the sample were found to be 4.0 and 5.8
respectively. The adsorbent sample has moisture content of 5.22 ± 0.1%, iodine number of 456.50 ± 59%, loss on
ignition 10.71 ± 0.18% bulk density of 0.84 ± 0.09%. The XRF analysis indicated that Ca, Si and Fe were major
constituents in the adsorbent sample. The SEM and TEM analysis results indicated good adsorptive characteristics
of the adsorbent. Result from the FTIR analysis indicate presence of some important components such as C=O, O-H,
C-O N-H, and P-H which responsible for high adsorptive capacity of the adsorbent. The equilibrium adsorption of
Cd(II) ion data was well fitted with Langmuir and Freundlich isotherms with correlation coefficient of 0.996 and 0.998
respectively. The kinetic study revealed that pseudo-second order kinetic was better fitted compared to pseudo first-order kinetic. Thermodynamic experiment indicated that the adsorption process was exothermic with ∆H equals
+27.84 KJ/mol and ∆S equals -0.993 KJ/molK.
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