NISCAIR Online Periodicals Repository

NISCAIR ONLINE PERIODICALS REPOSITORY (NOPR)  >
NISCAIR PUBLICATIONS >
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]

Files in This Item:

File Description SizeFormat
IJCT 17(5) 337-345.pdf181.27 kBAdobe PDFView/Open
 Current Page Visits: 1279 
Recommend this item

 

National Knowledge Resources Consortium |  NISCAIR Website |  Contact us |  Feedback

Disclaimer: NISCAIR assumes no responsibility for the statements and opinions advanced by contributors. The editorial staff in its work of examining papers received for publication is helped, in an honorary capacity, by many distinguished engineers and scientists.

CC License Except where otherwise noted, the Articles on this site are licensed under Creative Commons License: CC Attribution-Noncommercial-No Derivative Works 2.5 India

Copyright © 2012 The Council of Scientific and Industrial Research, New Delhi. All rights reserved.

Powered by DSpace Copyright © 2002-2007 MIT and Hewlett-Packard | Compliant to OAI-PMH V 2.0

Home Page Total Visits: 588096 since 06-Feb-2009  Last updated on 18-Sep-2014Webmaster: nopr@niscair.res.in