Isotherm model
Parameter
Untreated marine green algae
Alkaline treated marine green algae
Pb(II)
Zn(II)
Co(II)
Pb(II)
Zn(II)
Co(II)
Langmuir
R
2
0.9998
0.9991
0.9991
0.9981
0.9957
0.9996
q
max
mmol×g
-1
0.4538
0.5012
0.2406
0.6521
0.6886
0.4675
K
L
L×g
-1
4.4374
0.4262
0.4371
3.5563
1.1075
0.4734
R
L
0.0623
0.4144
0.4127
0.0765
0.2140
0.3936
Freundlich
R
2
0.9850
0.9954
0.9702
0.9874
0.9778
0.9893
1/n
0.7197
0.8611
0.7692
0.6067
0.7535
0.8007
K
F
mmol× g
-1
×(L×mmol
-1
)
1/n
0.6447
0.1523
0.0667
0.4549
0.5436
0.1412
Dubinin-Radushkevich
R
2
0.9877
0.9336
0.9478
0.9960
0.9577
0.9562
q
max
D-R
mmol×g
-1
0.5205
0.5632
0.2586
0.7089
0.6916
0.4874
E kJ×mol
-1
12.0712
14.1271
14.1287
11.4549
13.9057
13.4515
Table 1:
Isotherm parameters of the biosorption of Pb(II), Zn(II) and Co(II) respectively, on untreated and alkaline treated marine green algae (Ulva lactuca).
