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Title
A comparative study on adsorption of gallic acid onto polymeric adsorbents with amine functional groups
Authors
Ioana Ignat Violeta Neagu Ion Bunia Carmen Paduraru Irina Volf and Valentin I. Popa
Received
October 11, 2010
Published
Volume 45 Issue 3-4 March-April
Keywords
polyphenols, adsorption, polymeric adsorbents, kinetics, Langmuir isotherm, Freundlich isotherm
Abstract
The paper studies the adsorption of gallic acid from kinetic and thermodynamic perspectives, using several synthesized polymers with amine functional groups. These compounds, defined as P1, P115, P-Ba 2 and PHH, and obtained by appropriate chemical transformation reactions on crosslinked pyridine and acrylic copolymers, were characterized by weight and volume exchange capacities, their values being of 2.70 meq×g-1/1.26 meq×mL-1; 5.736 meq×g-1/0.187 meq×mL-1; 9.510 meq×g-1/0.510 meq×mL-1; 1.304 meq×g- 1/0.523 meq×mL-1, respectively. The obtained results indicated their adsorption capacities in the following order: P115 > P1 > P-Ba-2 > PHH. A study of the adsorption kinetics and thermodynamics of gallic acid was carried out on the most efficient resin. The adsorption isotherms were fitted to Langmuir and Freundlich models and the thermodynamics parameters were calculated for comparing the total adsorption capacities. The results obtained will be used to develop future procedures for the separation of natural polyphenolic compounds.
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