Heat and Mass Transfer

, Volume 55, Issue 2, pp 571–579 | Cite as

Moisture sorption isotherms and isosteric heat of sorption of Tunisian clay product

  • Nouha JhiderEmail author
  • Mohamed Bagané
Technical Note


The aim of this study was to determine the adsorption and desorption isotherms of Tunisian clay product at different temperatures with a water activity varying from 10.95 to 97% using the statistic gravimetric method, which is an important step to evaluate its hygroscopic character. It was found that when temperature increases, clay material becomes less hygroscopic due to physical and/or chemical changes in product. Ten mathematical models were used to fit experimental data of sorption isotherms. The fitting of the model to experimental data was evaluated with the correlation coefficient (R2) and the root mean square error (RMSE). The Oswin model was determined to be the best model for describing experimental data of adsorption and desorption in the investigated ranges of temperature and water activity. The net isosteric heat of sorption determined from sorption isotherms estimated from Oswin model and using Clausius-Clapeyron equation decreased continuously with increasing the equilibrium moisture content.


Tunisian clay Sorption isotherms Gravimetric method Oswin model Net isosteric heat of sorption 


A, B, C, K

Models constants for sorption isotherms

x0, y0

Models constants for isostoric heat of sorption


Water activity


Numbers of experimental data


Equilibrium moisture content (kg water/kg d.b)


Monolayer moisture content (kg water/kg d.b)


universal gas constant (J/mol.K)


Temperature (K)


Correlation coefficient


Root mean square error


Net isosteric heat (kJ/mol) subscripts









Dry basis


Guggenheim-Anderson-de Boer



  1. 1.
    Choudhury D, Sahu JK, Sharma GD (2011) Moisture sorption isotherms, heat of sorption and properties of sorbed water of raw bamboo (Dendrocalamus longispathus) shoots. Ind Crop Prod 3:211–216. CrossRefGoogle Scholar
  2. 2.
    Kaleemullah S, Kailappan R (2005) Moisture sorption isotherms of red chillies. Biosyst Eng 88:95–104. CrossRefGoogle Scholar
  3. 3.
    Yan Z, Sousa-Gallagher MJ, Oliveira FAR (2008) Sorption isotherms and moisture sorption hysteresis of intermediate moisture content banana. J Food Eng 86:342–348. CrossRefGoogle Scholar
  4. 4.
    Kaya S, Kahyaoglu T (2005) Thermodynamic properties and sorption equilibrium of pestil (grape leather). J Food Eng 7:200–207. CrossRefGoogle Scholar
  5. 5.
    Chen C (2006) Obtaining the isosteric sorption heat directly by sorption isotherm equations. J Food Eng 74:178–185. CrossRefGoogle Scholar
  6. 6.
    Cortés FB, Chejne F (2010) A rapid and novel approach for predicting water sorption isotherms and isosteric heats of different meat types. Meat Sci 86:921–925. CrossRefGoogle Scholar
  7. 7.
    McMinn WAM, Magel TRA (1997) Moisture sorption characteristics of starch materials. Dry Technol 15:1527–1551. CrossRefGoogle Scholar
  8. 8.
    Tsami E, Krokida MK, Drouzas AE (1999) Effect of drying method on the sorption characteristics of model fruit powders. J Food Eng 38:381–392. CrossRefGoogle Scholar
  9. 9.
    Karoglou M, Moropoulou A, Maroulis ZB, Krokida MK (2005) Water Sorption Isotherms of Some Building Materials. Dry Technol 23:289–303. CrossRefGoogle Scholar
  10. 10.
    Lamloumi R, Lecomte-Nana GL, Hassini L, Elcafsi MA, Smith D (2015) Effect of natural cellulosic fibers on the thermodynamic properties of a clay mixture product. IJESIT 4:371–389Google Scholar
  11. 11.
    Hammouda I, Mihoubi D (2014) Thermodynamic and mechanical characterization of kaolin clay. Pol J Chem Technol 16:28–35. CrossRefGoogle Scholar
  12. 12.
    Loh EWK, Wijeyesekera DC, Ciupala MA (2016) Moisture Desorption Studies on Polymer Hydrated and Vacuum Extruded Bentonite Clay Mat. J Heat Transf 138:1–7. CrossRefGoogle Scholar
  13. 13.
    Gannouni A, Bellagi A (2001) Acid activation of some clay from south Tunisian preparation of bleaching grounds for vegetable oils. J Soc Chim Tunisie 4:1357–1369Google Scholar
  14. 14.
    Guiza S, Bagane M, Al-Soudani AH, Ben Amor H (2004) Adsorption of basic dyes onto natural clay. Adsorpt Sci Technol 22:251–270. CrossRefGoogle Scholar
  15. 15.
    Srasra E, Kebir AN, Ayedi F, Bergaya F, Van DH (1988) Mineralogical identification of a bentonites clay deposit located near Gabes (Tunisia). J Soc Chim Tunisie 2:37–45Google Scholar
  16. 16.
    Greenspan L (1977) Humidity fixed points of binary saturated aqueous solutions. J Res Natl Bur Stand 81A:89–96. CrossRefGoogle Scholar
  17. 17.
    Fu MH, Zhang ZZ, Low PF (1990) Changes in the properties of montmorillonite-water system during the adsorption and desorption of water: hysteresis. Clay Clay Miner 38:485–492. CrossRefGoogle Scholar
  18. 18.
    Van Der Berg C, Bruin S (1981) Water activity and its estimation in food systems; theoretical aspects. In: Rockland LB, Stewart GF (eds) Water activity: Influences on food quality. Academic Press, New York, pp 1–61Google Scholar
  19. 19.
    Chung DS, Pfost HB (1967) Adsorption and desorption of water vapour by cereal grains and their products. Part I: Development of the General Isotherm Equation. Trans ASAE 10:549–551. CrossRefGoogle Scholar
  20. 20.
    Halsey G (1948) Physical adsorption on non-uniform surfaces. J Chem Phys 16:931–937. CrossRefGoogle Scholar
  21. 21.
    Henderson SM (1952) A basic concept of equilibrium moisture. Agric Eng 33:29–32Google Scholar
  22. 22.
    Oswin CR (1946) The kinetics of package life. III. The isotherms. J Chem Technol Biotechnol 65:419–423. CrossRefGoogle Scholar
  23. 23.
    Smith SE (1947) Sorption of wheat vapour by high polymers. J Am Chem Soc 16:646–651CrossRefGoogle Scholar
  24. 24.
    Chirife J, Iglesias HA (1978) Equations for fitting water sorption isotherms of foods: Part I. A review. J Food Technol 13:159–174. CrossRefGoogle Scholar
  25. 25.
    Iglesias HA, Chirife J (1981) An equation for fitting uncommon water sorption isotherms in foods. Lebensm Wiss Technol 14:111–117Google Scholar
  26. 26.
    Castillo MD, Martinez EJ, Gonzalez HHL, Pacin AM, Resnik SL (2003) Study of mathematical models applied to sorption isotherms of Argentinean black bean varieties. J Food Eng 60:343–348. CrossRefGoogle Scholar
  27. 27.
    Aguerre SJ, Suarez C, Viollaz PE (1988) The temperature dependence of isosteric heat of sorption of some cereal grains. Int J Food Sci Technol 23:141–145. CrossRefGoogle Scholar
  28. 28.
    Brunauer S, Deming LS, Deming WE, Troller E (1940) On the theory of Van Der Waals adsorption of gases. J Am Chem Soc 62:1723–1732. CrossRefGoogle Scholar
  29. 29.
    Mihoubi D, Zagrouba F, Ben Amor M, Bellagi A (2002) Drying of clay.I Material characteristics. Dry Technol 20:465–487. CrossRefGoogle Scholar
  30. 30.
    Chemkhi S, Zagrouba F, Bellagi A (2004) Thermodynamics of water sorption in clay. Dessalination 166:393–399. CrossRefGoogle Scholar
  31. 31.
    Mazza G, LeMaguer M (1980) Dehydration of onion: some theoretical and practical consideration. J Food Technol 15:181–194. CrossRefGoogle Scholar
  32. 32.
    Karel M (1975) Stability of low and intermediate moisture foods. In: Goldbright SA, Rey LR, Rothmayer WW (eds) Freeze Drying and Advanced Food Technology. Academic Press, New York, p 643Google Scholar
  33. 33.
    Labuza TP (1968) Sorption phemomena in Foods. J Food Technol 22:15–24Google Scholar
  34. 34.
    Tsami E, Marinos-Kouris D (1990) Water sorption isotherms of Raisins, Currants, Figs, Prunes and Abricots. J Food Sci 55:1594–1597. CrossRefGoogle Scholar
  35. 35.
    Maroulis ZB, Tsami E, Saravacos GD (1988) Application of the GAB model to the moisture sorption isotherm for dried fruit. J Food Eng 7:63–78. CrossRefGoogle Scholar
  36. 36.
    Mok C, Hettiarrachchy NS (1990) Moisture sorption characterizes of ground Sulfower Nutmeat and its products. J Food Sci 55:756–789. CrossRefGoogle Scholar
  37. 37.
    Sanchez ES, Sanjuan R, Simal S, Rosello C (1997) Calorimetric techniques applied to the determination of isosteric heat of desorption for potato. J Sci Food Agric 74:57–63.<57::AID-JSFA770>3.0.CO;2-8 CrossRefGoogle Scholar
  38. 38.
    Mihoubi D, Bellagi A (2006) Thermodynamic analysis of sorption isotherms of bentonite. J Chem Thermodyn 38:1105–1110. CrossRefGoogle Scholar

Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Applied Thermodynamics Unit Research, National Engineering School of Gabès (ENIG)University of GabèsGabèsTunisia

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