Table 6: Gibbs free energy (KJ/mol), Enthalpy change (KJ/mol) and Entropy Change (KJ/molK) for the removal of Cu and Fe ions on CHS and COMP.
|
|
Heavy metal ions |
|
|
|
Adsorbent |
Temperature (K) |
Cu |
Fe |
|
CHS |
303 |
-1.401 |
-1.731 |
|
|
318 |
-1.607 |
-1.825 |
|
|
333 |
-1.695 |
-1.914 |
|
|
348 |
-1.868 |
-2.005 |
|
|
363 |
-1.804 |
-2.091 |
|
COMP |
303 |
-1.484 |
-1.619 |
|
|
318 |
-1.576 |
-1.718 |
|
|
333 |
-1.787 |
-1.830 |
|
|
348 |
-1.898 |
-1.991 |
|
|
363 |
-1.932 |
-2.057 |
|
CHS |
ΔH |
0.781 |
0.111 |
|
|
ΔS |
0.007 |
0.006 |
|
COMP |
ΔH |
1006.376 |
853.350 |
|
|
ΔS |
8.233 |
8.120 |