Amino Acid Adsorption on Zeolite β

Abstract

A thermodynamic equilibrium model has been developed to describe amino acid adsorption on microporous materials. The model addresses electrostatic, hydrophobic and steric interactions. A procedure for fitting the model's parameters is presented and should be applicable to the majority of the common 20 amino acids. The approach is demonstrated using experimental measurements of L-phenylalanine and L-arginine on zeolite beta. Between the adsorption mechanisms of ion exchange and physisorption, the first can contribute as much as two-thirds of the phenylalanine adsorbed at saturation. For the materials tested, ion exchange is maximized when the zeolite's silicon-to-aluminum ratio is 12. When this atom ratio is raised to 100, ion exchange no longer plays a significant role, but the amount physisorbed increases by 30%.

Effect of Silica Alumina Ratio and Thermal Treatment of Beta Zeolites on the Adsorption of Toluene from Aqueous Solutions

“…Concerning the binding constant b, Beta360c showed a higher value than those of Beta25c and Beta38c, which are not significantly different from each other at 95% of probability. This finding could be explained by considering that adsorption onto zeolites is driven by both electrostatic and non-covalent interactions [41]. It can be supposed that electrostatic interactions have a negligible contribution to the adsorption of an organophilic solute such as TOL, characterized by logK ow of 2.73.…”

Immobilization of L-Lysine on Zeolite 4A as an Organic-Inorganic Composite Basic Catalyst for Synthesis of α,β-Unsaturated Carbonyl Compounds under Mild Conditions

“…The adsorption behavior of amino acids on the surfaces of materials such as hydroxyapatite, zirconium phosphate modified silica, silica-gels, activated carbon and zeolite has been investigated. [10][11][12][13][14][15][16] Although many cases of successful immobilization using inorganic porous materials have been reported, most of the research published only uses standard activity assays to monitor the catalytic performance. In other words, the application of amino acids adsorbed on inorganic supports in terms of catalytic purposes has received very little attention.…”

Comparison of ordered mesoporous materials sorption properties towards amino acids

“…So far the adsorption of amino acids has been investigated on diverse materials such as polymeric adsorbents, active carbon, zeolite, hydroxyapatite, zirconium phosphate, modified silica, silica-gels (Munsch et al 2001;Vlasova and Golovkova 2004;Imamura et al 2003;Krohn and Tsapatsis 2005;Palit and Moulik 2001;El Shafei and Moussa 2001;El Shafei 2002). The promising adsorbents are also ordered mesoporous materials because of their excellent physical and chemical properties (Kresge et al 1992).…”