Sorption isotherms and isosteric energy of Manihot esculenta leaves

Edoun M., . and Kuitche A., . Sorption isotherms and isosteric energy of Manihot esculenta leaves. pp. 343-348. ISSN 22317546

This work presents the study sorption isotherms of Manihot esculenta leaves. Desorption-adsorption isotherms were determined by using static gravimetric method at 30 40 and 50C for water activity ranging from 0.10 to 0.90. Results obtained show that at high water activities adsorption of water increased with increasing temperature and isotherm curves of adsorption and desorption did not follow the same lend: the hysteresis cycle. The sorption isotherms of M. esculenta leaves are of type II. Five different models were used to study these experimental curves and GABS model best describes these sorption isotherms (MRE 10 and R 0.996). The sorption heat of the monolayer HM was 3.073 kJ.mole-1 while that for the multilayer was 0.970 kJ.mole-1. For M. esculenta isosteric leaves heat of sorption varies from 32.15 to 3.54 kJ.mole-1 and the values of q0 and X0 for desorption were respectively 71.43 kJ.mole-1 and 7.643 g water/g (d.b).

Full text available from: Official URL: http://ifrj.upm.edu.my/21%20(01)%202014/49%20IFRJ%...

Abstract

This work presents the study sorption isotherms of Manihot esculenta leaves. Desorption-adsorption isotherms were determined by using static gravimetric method at 30 40 and 50C for water activity ranging from 0.10 to 0.90. Results obtained show that at high water activities adsorption of water increased with increasing temperature and isotherm curves of adsorption and desorption did not follow the same lend: the hysteresis cycle. The sorption isotherms of M. esculenta leaves are of type II. Five different models were used to study these experimental curves and GABS model best describes these sorption isotherms (MRE 10 and R 0.996). The sorption heat of the monolayer HM was 3.073 kJ.mole-1 while that for the multilayer was 0.970 kJ.mole-1. For M. esculenta isosteric leaves heat of sorption varies from 32.15 to 3.54 kJ.mole-1 and the values of q0 and X0 for desorption were respectively 71.43 kJ.mole-1 and 7.643 g water/g (d.b).

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Item Type:	Article
AGROVOC Term:	Sorption
AGROVOC Term:	Manihot esculenta
AGROVOC Term:	Gravimetric analysis
AGROVOC Term:	Water activity
AGROVOC Term:	Adsorption
AGROVOC Term:	Desorption
AGROVOC Term:	Moisture content
AGROVOC Term:	Distilled water
AGROVOC Term:	Relative humidity
AGROVOC Term:	Equilibrium theory
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:26
URI:	http://webagris.upm.edu.my/id/eprint/21296

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