Sani, Nor Diyana Md
(2009)
Adsorption of malic acid in aqueous
solution by amberlite xad-4.
Project Report.
Universiti Sains Malaysia.
(Submitted)
Abstract
The adsorption of malic acid onto XAD-4 was studied. The effect of shaking time, pH,
temperature, concentration of malic acid and amount of adsorbent on the adsorption of
malic acid was investigated by batch process. It was found that the adsorption process works
best at lower pH (pH 2.0) and shaking time of 75 min. The equilibrium data could be
described well by Langmuir and Freundlich isotherms but the best fit is the Freundlich model
based on the higher correlation coefficient (R2
) value. Thermodynamic parameters such as
enthalpy change (l1H 0
), free energy change (l1Go) and entropy change (l1So) were calculated.
The results shows that the adsorption is endothermic, spontaneous and entropy driven
respectively.
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