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Table 4 Thermodynamic parameters for Pb(II) adsorption on iron modified pomegranate peel carbons (Fe2+-PPC and Fe3+-PPC)

From: Modification of pomegranate waste with iron ions a green composite for removal of Pb from aqueous solution: equilibrium, thermodynamic and kinetic studies

Temp (°C) Fe2+-PPC Fe3+-PPC
ΔG* ΔH* ΔS* ΔG* ΔH* ΔS*
25 − 0.17    50.0   
55 − 3.87 40. 6 0.136 − 2.51 27.5 0.092
85 − 8.35    − 5.45   
  1. * kJ/mol