A COMPARATIVE STUDY ON ADSORPTION OF GALLIC ACID ONTO POLYMERIC ADSORBENTS WITH AMINE FUNCTIONAL GROUPS

作者：Ignat Ioana^*; Neagu Violeta; Bunia Ion; Paduraru Carmen; Volf Irina; Popa Valentin I

来源：Cellulose Chemistry and Technology, 2011, 45(3-4): 251-256.

• polyphenols
• adsorption
• polymeric adsorbents
• kinetics
• Langmuir isotherm
• Freundlich isotherm

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 meqxg(-1)/1.26 meqxmL(-1); 5.736 meqxg(-1)/0.187 meqxmL(-1); 9.510 meqxg(-1)/0.510 meqxmL(-1); 1.304 meqxg(-1) /0.523 meqxmL(-1), respectively. The obtained results indicated their adsorption capacities in the following order: P115 > PI > 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.

• 出版日期2011-4