Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 387, Issue 1-3, Pages 50-56Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2011.07.024
Keywords
Adsorption; alpha-Alumina; Catechol; 3,4-Dihydroxybenzoic acid; DRIFT spectra; Kinetics
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Funding
- Department of Science and Technology
- CSIR, New Delhi, India
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Adsorption kinetics and isotherms and the surface complexation of 3,4-dihydroxybenzoic acid (3,4-DHBA) and catechol at the alpha-alumina/electrolyte interface were investigated. The state of equilibrium for adsorption of 3,4-DHBA onto a-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 (similar to 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 a-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 alpha-alumina surface. (C) 2011 Elsevier B.V. All rights reserved.
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