Adsorption and surface complexation of trimesic acid at the alpha-alumina-electrolyte interface

Journal of Colloid and Interface Science
Jayanta M Borah, Sekh Mahiuddin

Abstract

Adsorption kinetics, adsorption isotherms and surface complexation of trimesic acid onto alpha-alumina surfaces were investigated. Adsorption kinetics of trimesic acid with an initial concentration of 0.5 mM onto alpha-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 mM NaCl (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 alpha-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 trime...Continue Reading

References

Jan 27, 1998·Journal of Colloid and Interface Science·J D Filius Van Riemsdijk WH
May 26, 1999·Journal of Colloid and Interface Science·C R Evanko, D A Dzombak
May 18, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Markus LackingerGeorge W Flynn
Aug 30, 2005·Journal of Colloid and Interface Science·Susmita Sen Gupta, Krishna G Bhattacharyya
Sep 26, 2006·Journal of Colloid and Interface Science·Yanxiao ChenGongying Wang
Nov 14, 2006·Journal of Colloid and Interface Science·Manash R Das, Sekh Mahiuddin
Oct 2, 2007·Journal of Colloid and Interface Science·Jayanta M BorahSekh Mahiuddin

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