Biomedical Engineering Reference
In-Depth Information
Table 5. Kinetic model parameters for adsorption of cationic dyes by
γ
-PGA at different experimental conditions
Pseudo first order model
Pseudo second order model
Experimental
conditions
r
2
r
2
q
e
(mg/g)
k
1
(L/min)
χ
2 a
q
e
(mg/g)
k
2
(g/mg min)
χ
2 a
Au-O at 100 mg/L
b
1.04 x 10
-2
164.54
0.9917
0.914
2.13
172.03
0.996
0.09
Au-O at 200 mg/L
b
4.75 x 10
-3
249.99
0.7618
0.941
3.41
261.88
0.992
0.66
Rh-B at 100 mg/L
b
6.95 x 10
-3
184.95
0.8590
0.853
5.32
195.94
0.981
0.67
Rh-B at 200 mg/L
b
4.50 x 10
-3
295.69
0.5988
0.810
21.23
315.89
0.962
4.39
Sa-O at 100 mg/L
b
2.18 x 10
-3
226.22
0.3851
0.931
15.42
249.14
0.985
2.64
Sa-O at 200 mg/L
b
5.25 x 10
-4
414.97
0.1593
0.964
55.38
453.77
0.993
5.64
MB at 100 mg/L
c
6.37 x 10
-3
226.17
0.8995
0.848
6.45
237.22
0.981
0.80
MG at 100 mg/L
c
7.91 x 10
-3
185.45
0.9227
0.882
3.68
195.25
0.992
0.25
BB-Y at 301 K
d
1.50 x 10
-3
267.83
0.2902
0.882
57.49
289.74
0.961
15.17
BB-Y at 318 K
d
3.26 x 10
-3
233.57
0.5493
0.789
24.91
248.17
0.950
6.19
BB-Y at 333 K
d
6.25 x 10
-3
221.27
0.8312
0.838
8.66
230.16
0.968
1.62
BB-Y at pH 2.00
e
5.49 x 10
-4
87.38
0.0539
0.994
0.74
104.54
0.994
1.87
BB-Y at pH 3.00
e
2.48 x 10
-3
177.41
0.3308
0.942
10.26
192.00
0.993
1.10
BB-Y at pH 3.41
e
1.40 x 10
-3
248.08
0.2642
0.923
31.20
270.19
0.987
4.51
BB-Y at pH 3.94
e
1.50 x 10
-3
267.83
0.2902
0.882
57.49
289.74
0.961
15.17
BB-Y at pH 5.00
e
1.36 x 10
-3
285.30
0.2854
0.872
63.63
309.52
0.960
16.67
Source
: Inbaraj et al. 2006a; 2006c; 2008.
a
χ
2
= Σ((q
ex
-q
th
)
2
/q
th
), where q
ex
and q
th
are experimental and theoretical amounts of dye adsorbed (mg/g) at time t;
b
γ-PGA dose: 0.4 g/L, Temperature: 301 K, pH:
natural pH;
c
γ-PGA dose: 0.4 g/L, Temperature: 301 K, pH: natural pH;
d
BB-Y concentration: 100 mg/L, γ-PGA dose: 0.3 g/L, pH: natural pH;
e
BB-Y
concentration: 100 mg/L, γ-PGA dose: 0.3 g/L, Temperature: 301 K, pH: natural pH.