Desorption of β-carotene from bentonite adsorbent under microwave irradiation

Authors

  • Tatjana Novaković University of Belgrade, Institute of Chemistry, Technology and Metallurgy
  • Ljiljana Rožić University of Belgrade, Institute of Chemistry, Technology and Metallurgy
  • Srdjan Petrović University of Belgrade, Institute of Chemistry, Technology and Metallurgy
  • Dragomir Stanisavljev University of Belgrade, Faculty of Physical Chemistry

DOI:

https://doi.org/10.20450/mjcce.2015.518

Keywords:

β–carotene, desorption, bentonite, microwave irradiation, kinetics

Abstract

The desorption behavior of β-carotene from a bentonite adsorbent under microwave irradiation in isopropanol was studied as a function of temperature and different initial loading concentrations. A first-order, two-component, three-parameter model described the desorption kinetics with a coefficient of determination R2 > 0.9932, and the β-carotene desorption process under microwave irradiation was controlled by both rapid and slow desorption. The activation energies of β-carotene desorption for the rapid and slow desorption processes were 19.61 and 53.04 kJ mol–1, respectively. It was observed that the desorption equilibrium data fitted well to both the Freundlich and Langmuir isotherms. The data obtained from the desorption-isotherm model were used to determine the thermodynamic parameters. The positive value of free energy indicates the non-spontaneity of β-carotene desorption. The change in entropy relative to the enthalpy of desorption reveals that the reaction is physical in nature.

Author Biographies

Tatjana Novaković, University of Belgrade, Institute of Chemistry, Technology and Metallurgy

Department of Catalysis and Chemical Engineering

Ljiljana Rožić, University of Belgrade, Institute of Chemistry, Technology and Metallurgy

Department of Catalysis and Chemical Engineering

Srdjan Petrović, University of Belgrade, Institute of Chemistry, Technology and Metallurgy

Department of Catalysis and Chemical Engineering

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Published

2015-11-12

How to Cite

Novaković, T., Rožić, L., Petrović, S., & Stanisavljev, D. (2015). Desorption of β-carotene from bentonite adsorbent under microwave irradiation. Macedonian Journal of Chemistry and Chemical Engineering, 34(2), 363–371. https://doi.org/10.20450/mjcce.2015.518

Issue

Vol. 34 No. 2 (2015)

Section

Materials Chemistry

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