Study of the kinetics and isotherm adsorption of Pb(II) and Cd(II) ions from aqueous solution by Eucalyptus Gomphocephala roots

Ragwan  Mohammed Ghait; Saada Salem Abdulhafeed

doi:10.36602/jsba.2023.16.126

المؤلفون

Ragwan Mohammed Ghait Faculty of Science, Sirte University, Sirte, Libya
Saada Salem Abdulhafeed Faculty of Science, Sirte University, Sirte, Libya

DOI:

https://doi.org/10.36602/jsba.2023.16.126%20

الكلمات المفتاحية:

Adsorption,، Heavy metals,، Lead, Cadmium,، Carbonized Eucalyptus roots

الملخص

This study is concerned about the adsorption of lead (II) and cadmium (II) ions from their aqueous solutions using Eucalyptus roots as adsorbent material, High percentage of ion removal equal to 93.5% and 96.6%, Pb(II) and Cd(II) with the adsorption capacity of 45.9mg/g and 47.6mg/g for both metal ions (respectively) at pH of 5-7, was reported. The system reached the equilibrium state approximately after 30min, and the adsorption percentage of these metals increased with increasing the concentration and the amount of adsorbent until reaching the equilibrium state. The adsorption process followed pseudo-second-order model and corresponded to the Freundlich isotherm correlation coefficient, which means that the adsorption is multi-layered and heterogeneous. The adsorption capacity of the studied sorbent towards both metal ions was increased with the increase in temperature, indicating that the adsorption process is endothermic. The thermodynamic constants were also calculated. Negative and positive values of Gibbs free energy and entropy were reported. These values indicated that the applied system is spontaneous and random. Aim of research is to prove that Eucalyptus roots are an one of the low cost materials are capable of adsorbing pollutants such as heavy metals from aqueous media.

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