Kinetics model
Parameter
Untreated marine green algae
Alkaline treated marine green algae
Pb(II)
Zn(II)
Co(II)
Pb(II)
Zn(II)
Co(II)
q
e
xp mmol×g
-1
0.0865
0.584
0.0759
0.0974
0.0676
0.1101
Pseudo-first order model
R
2
0.9270
0.8932
0.7774
0.8450
0.9969
0.8933
q
e
mmol×g
-1
0.0193
0.0061
0.0028
0.0690
0.0079
0.0813
k
1
min
-1
6.1244×10
-3
2.8658×10
-3
5.2106×10
-4
4.5158×10
-3
2.6053×10
-3
3.9097×10
-4
Pseudo-second order model
R
2
0.9998
0.9998
0.9996
0.9999
0.9997
0.9996
q
e
mmol×g
-1
0.0875
0.0586
0.0755
0.0978
0.0678
0.1108
k
2
g×mmol
-1
×min
-1
4.7626
11.0509
14.5476
10.6541
17.4956
16.4462
Intra-particle diffusion model
zone I
R
2
0.9445
0.9401
0.4898
0.9431
0.9402
0.9242
c mmol×L-1
0.0694
0.0539
0.0670
0.0910
0.0481
0.0925
kdiffI mmol×g
-1
×min
-1
0.0017
0.0003
0.0014
0.0005
0.0013
0.0019
zone II
R
2
0.8453
0.9977
0.7407
0.6805
0.9971
0.9431
c mmol×L-1
0.0782
0.0587
0.0704
0.0914
0.0599
0.0960
kdiffII mmol×g
-1
×min
-1
0.0007
0.0007
0.0004
0.0005
0.0006
0.0011
Table 2:
Kinetics parameters of the biosorption of Pb(II), Zn(II) and Co(II) respectively, on untreated and alkaline treated marine green algae (Ulva lactuca).
