Ihermodynaniscs of Chromium (Vi) Removal From Aqueous Solution by Adsorption Technique Using Activated Carbon From Pods of Wood Apple and Commercicilly Available Carbon
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Date
2010
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Abstract
In this study activated carbon from pods of woodappie, an agro waste has been used as at)
adsorbent for removal of Cr(VI) from aqueous solutions. To analyze the efficiency of the
activated carbon from woodappie (ACW) the experiments were also conducted with commercial
activated carbon (ACC) and the results compared. The adsorption of Cr (VI) was
carried out by varying the temperature and agitation time at two different pH . The negative
value of free energy change (AG) and enthalpy (AH) show the spontaneous and exothermic
nature of adsorption of Cr (VI) with respect to both the adsorbents used in this study .The
positive value of entropy change (AS) indicate some structural changes in the adsorbate
and the adsorbent and increased randomness during adsorption.