BORAH , J M and Mahiuddin, S
(2008)
Adsorption and surface complexation of trimesic acid at the alpha-Alumina electrolyte interface.
J Colloid Interface Science, 322.
pp. 6-12.
Abstract
Adsorption kinetics, adsorption isotherms and surface complexation of trimesic acid onto α-alumina surfaces were investigated. Adsorption
kinetics of trimesic acid with an initial concentration of 0.5 mM onto α-alumina surfaces were carried out in batch method in presence of 0.05 mM
NaCl(aq) at pH 6 and 298.15, 303.15 and 313.15 K. Adsorption isotherms were carried out at 298.15 K, pH 5–9, and 0.05 mMNaCl(aq) by varying
trimesic acid concentration from 0.01 to 0.6 mM. Three kinetics equations such as pseudo-first-order, pseudo-second-order and Ho equations were
used to estimate the kinetics parameters of the adsorption of trimesic acid on the α-alumina surfaces. Ho equation fits the experimental kinetics
data significantly better and the estimated equilibrium concentration is in excellent agreement with the experimental value. The adsorption data
were fitted to Freundlich and Langmuir adsorption model and the later best fits the adsorption isotherms. Comparison of adsorption density of
trimesic acid with that of benzoic and phthalic acids follows the sequence: benzoic acid < trimesic acid < phthalic acid. The negative activation
energy and the Gibbs free energy for adsorption indicate that the adsorption of trimesic acid onto α-alumina is spontaneous and facile. DRIFT
spectroscopic studies reveal that trimesate forms outer-sphere complexes with the surface hydroxyl groups that are generated onto α-alumina
surfaces in the pH range of the study
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