Modeling of the relationship between the thermodynamic parameters ?H? and ?S? with temperature in the removal of Pb ions in aqueous medium: Case study

In this work, the removal of Pb from six different adsorbents was evaluated, considering that Delta H degrees and Delta S degrees depend on temperature, and the implications of the strong correlation between Delta H degrees and Delta S degrees on the adsorption of Pb in the studied systems. The obtained results showed that there is a strong causal correlation between Delta H degrees-Delta S degrees common to the studied systems. The enthalpy-entropy relationship allowed to determine the isokinetic temperature. This suggests that the nature of the active sites (adsorbents) and the chemical species of the Pb could be similar, and that the adsorption mechanism could be driven by weak interaction forces.

Automated summary

The study evaluated the removal of Pb using six different adsorbents, taking into account the temperature dependence of Delta H degrees and Delta S degrees and the implications of their strong correlation on Pb adsorption. The results revealed a strong causal correlation between Delta H degrees and Delta S degrees in the studied systems. The enthalpy-entropy relationship allowed determination of the isokinetic temperature, suggesting that the adsorption mechanism is driven by weak interaction forces due to similarities in the nature of the adsorbents and the chemical species of Pb.