Kinetic, Equilibrium and Thermodynamic Study of the Adsorption of Pb (II) and Cd (II) Ions from Aqueous Solution by the Leaves Biomass of Guava and Cashew Plants

Table 5.

Thermodynamic Parameter forGuava Plant Leave (GPL)

Parameters

ΔH

ΔS

ΔG

R2

 

(KJ/mol)

(KJ/mol/K)

 

 

 

 

 

 

Temperature(K)

 

 

298

308

318

328

333

 

Pb2+

0.0202

68.6927

-276.84

-349.35

-1944.8

-3028.8

-1803.8

0.6854

Cd2+

13.5222

38.7922

2106.0

1640.6

774.09

524.1

1083.8

0.7625

Zn2+

-7.3252

-26.5640

1587.3

392.20

-726.23

1466.8

2763.6

0.0679