Evaluation of thermodynamic parameters for adsorption of heavy metals by green adsorbents

摘要

Thermodynamic parameters G degrees, H degrees and S degrees are indicators of the possible nature of adsorption. This reviewsummarizes the thermodynamic properties of metal adsorption by green adsorbents. Conclusively, the adsorption of heavy metals ions by green adsorbents isspontaneous in most cases (G degrees<0). Since the thermodynamic parameters were evaluated from very different adsorbent/adsorbate combinations, it is not possible to note a correlation between the corresponding enthalpy change (H degrees) and entropy change (S degrees) following adsorption.