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Research Journals >
Indian Journal of Chemical Technology (IJCT) >
IJCT Vol.17 [2010] >
IJCT Vol.17(5) [September 2010] >
| Title: | Adsorption of catechin from aqueous solutions on polymeric resins and activated carbon |
| Authors: | Gogoi, Parikshit |
| Keywords: | Catechin
Activated carbon
Polymeric resin
Adsorption
Langmuir isotherm |
| Issue Date: | Sep-2010 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | Catechin, a bioflavonoid found in
green tea leaves has various applications in food and pharmaceutical
industries. With a view to develop adsorptive separation process for the
extraction of catechin from green tea, the batch equilibrium adsorption of
catechin from aqueous solutions using commercially available activated charcoal,
styrene-divinylbenzene (SDVB) and acrylic resins with different hydrophobicity,
surface areas and pore radii has been studied. Adsorption isotherms were
interpreted from Langmuir, Freundlich and Redlich-Peterson isotherms. However,
almost in all cases, Langmuir isotherm exhibited better fit of experimental
data. It appears that capacity of the adsorbate/adsorbent system depends on
various interactions that occur at the solid liquid interface i.e.,
hydrophobic, dipole-dipole and hydrogen bonding. Physical properties of the
resin such as surface area, pore radius, and porosity and the chemical
characteristics of the solution i.e., solvent type and pH also play a major
role in determining rates and equilibrium of adsorption. The heat of adsorption
(ΔHº) was determined from Van’t Hoff
plot using equilibrium data generated at different temperatures and the
observed differences in ΔHº for
different adsorbents have been explained from mechanistic consideration. |
| Page(s): | 337-345 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-0991 (Online); 0971-457X (Print) |
| Source: | IJCT Vol.17(5) [September 2010]
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