Abdul Muiz, Aziz
(2009)
Adsorption of gallic acid in aqueous solution by Amberlite XAD-7.
Other.
Universiti Sains Malaysia.
Abstract
The adsorption behaviour of gallic acid onto XAD-7 was studied to determine the effects of
pH, contact time, temperature, concentration of gallic acid and amount of XAD-7. The
adsorption capacities were strongly influenced by the solution pH where the optimum
working pH was found to be at pH 2.0. The shaking time (45 min) was found suitable for
maximum adsorption. The batch equilibrium data were correlated to Langmuir and
Freundlich isotherm and the data fitted better to the langmuir isotherm. The
thermodynamic parameters were calculated and the corresponding value showed that the
adsorption of gallic acid onto XA0-7 was spontaneous, entropy-driven and endothermic.
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