Capture Of Toxic Pollutants By Pistacia lentiscus Leaves As A Low-Cost Biosorbent: Equilibrium, Kinetics And Thermodynamic Studies

IJEP 41(7): 723-735 : Vol. 41 Issue. 7 (July 2021)

Zerhouni Anissa, Bestani Benaouda*, Attouti Salima and Benderdouche Nouredine

Abdelhamid Ibn Badis University, Laboratory of Structure, Elaboration and Application of Molecular Materials (SEAMM), Faculty of Science and Technology, Mostaganem, Algeria


Presenting expensive disposal problems during extraction of its essential oil, Pistacia lentiscus leaf was chosen in this investigation as a biosorbent for Rhodamine B and Pb2+ ions removal from simulated solution. Chemical and physico-chemical methods, such as FTIR analyses, minimum expenditure basket (MEB), mesoporous and microporous available areas and zero point charge (pHzpc) were performed to characterize the biosorbent prior to its utilization. Effect of conventional parameters on biosorption of both pollutants, such as equilibrium time, adsorbent dose, pH and temperature were studied. Well known adsorption isotherms, namely Langmuir, Freundlich and Tempkin were used for adsorption equilibrium data analysis in their linear and non-linear forms. The rate of adsorption was encouraging for P. lentiscus waste used as such. Linearized and non-linearized Freundlich-biosorption models are more representative for the experimental data predicting heterogeneous surface coverage of the adsorbents. Magnitudes of RL and n depict the favourability biosorption processes. Biosorption mechanism found to obey pseudo-second-order kinetic model and indicates that the sorption process is controlled by intra-particle diffusion. Thermodynamic analysis of the adsorption processes of both pollutants confirms their spontaneity and exothermicity. Compared to other biosorbents, Pistacia lentiscus leaves as a bio-renewable and affordable biomaterial can be efficiently used in removing organic and inorganic pollutants from industrial effluents.


Biosorption, Pistacia lentiscus, Isotherm models, Thermodynamics


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