Adsorption of Organic Acids on Polyaminated Highly Porous Chitosan:  Equilibria

Abstract

The adsorption of organic acids on a new weakly basic ion exchanger, highly porous polyaminated chitosan (Chitopearl CCS), which has the primary amino group of chitosan and the primary, secondary, and tertiary amino groups of poly(ethylene imine), appeared feasible technically. Three different organic acids, acetic acid (R‘-COOH), malic acid (R‘‘-(COOH)2) and citric acid (R‘‘‘-(COOH)3) were used in this experimental study. These organic acids were adsorbed on the resin by an acid/base neutralization reaction. The adsorption isotherms were independent of the initial concentrations of organic acids. The theoretical equations for the adsorption isotherms were derived by considering the dissociation of organic acids in the solution and the adsorption on each functional group and by applying the mass action law. They correlated the experimental adsorption isotherms and titration curves well. Chitopearl CCS was observed to be a feasible medium for the adsorption of organic acids. Especially in high pH region (low concentration region), Chitopearl CCS could adsorb more organic acids than a commercial ion exchanger, DIAION WA30.

Conversion of scallop viscera wastes to valuable compounds using sub-critical water

“…The separating of amino and organic acids in single or binary systems has been already reported by one of the authors using adsorption/ion exchange technology. [30][31][32][33][34] However, separation of multicomponent organic compounds will be reported in the subsequent stages of this research.…”

Investigating the differences in acid separation behaviour on weak base ion exchange resins

“…A number of experimental and theoretical studies have been reported on the sorption of various acids on weak base resins (Kunin, 1958;Hel!erich, 1962;Adams, Jones & Miller, 1969;Holl and Sontheimer, 1977;Hubner and Kadlec, 1978;Rao and Gupta, 1982a,b;Hel!erich and Hwang, 1985;Bhandari, 1998;Garcia and King, 1989;Bhandari, Juvekar & Patwardhan, 1992a,b, 1993Bhandari, Sawarkar & Juvekar, 1996, Yoshida, Kishimato & Kataoka, 1994Cloete and Marais, 1996;Takatsuji and Yoshida, 1994, 1998aJuang and Chou, 1996;Husson and King, 1999a,b). In many instances, acid sorption was considered irreversible and the sorption equilibrium was interpreted in terms of simple Langmuir-or Freundlich-type isotherm.…”

Cell Adsorption and Selective Desorption for Separation of Microbial Cells by Using Chitosan-Immobilized Silica

“…For E. coli and A. hydrophila, the use of citric acid resulted in higher cell recovery than with acetic acid. This result suggested that citric acid was attracted to the amino groups of chitosan and that these specific interactions (such as electrostatic and hydrophobic forces) for CIS were stronger than cell adsorption (18). Similarly, when the basic amino acids were compared, arginine (pK a ϭ 12.5; 25°C) has a more basic character than histidine (pK a ϭ 6.0; 25°C).…”