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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
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