BORAH , JAYANTA M and SARMA , JYOTIRMOY and MAHIUDDIN , S
(2011)
Adsorption comparison at the á-alumina/water interface: 3,4- dihydroxybenzoic acid vs catechol.
colloid and surface A, 387.
pp. 50-56.
Abstract
Adsorption kinetics and isotherms and the surface complexation of 3,4-dihydroxybenzoic acid (3,4DHBA)
and catechol at the -alumina/electrolyte interface were investigated. The state of equilibrium
for adsorption of 3,4-DHBA onto -alumina surface at pH 5 was attained at 120 min, whereas it was
90 min for catechol, but at pH 10 the state of equilibrium for the both the systems was same (
∼60 min).
The pseudo-second-order kinetic equation of nonlinear form (Eq. (3)) fits the experimental kinetic data
significantly better than the linear form (Eq. (2)) in the entire time duration. The adsorption density of
3,4-DHBA onto the -alumina surfaces at pH 10 and at similar experimental conditions is equivalent
to catechol. DRIFT spectra indicate that 3,4-DHBA forms both outer- and inner-sphere complexes and
catechol forms bidentate mononuclear complex with the -alumina surface.
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