Biomedical Engineering Reference
In-Depth Information
Table 7. Isotherm model parameters for adsorption of cationic dyes by
γ
-PGA at different temperatures
a
Fitted isotherm parameters
Isotherm
model
Au-O/
γ
-PGA
Rh-B/
γ
-PGA
Sa-O/
γ
-PGA
BB-Y/
γ
-PGA
301 K
318 K
333 K
301 K
318 K
333 K
301 K
318 K
333 K
301 K
318 K
333 K
Freundlich
K
F
(L
n
mg
1-n
/g)
44.24
27.85
24.30
31.89
15.68
11.02
129.60
95.31
76.84
112.59
68.08
54.42
N
2.54
2.33
2.44
1.79
1.54
1.52
2.33
2.44
2.56
2.82
2.52
2.53
r
2
0.994
0.997
0.999
0.975
0.987
0.978
0.954
0.984
0.975
0.959
0.968
0.973
χ
2
6.33
3.43
0.52
30.68
18.21
20.55
77.84
32.61
33.69
45.58
28.61
18.77
Langmuir
q
m
(mg/g)
277.29
203.60
197.50
390.25
378.00
305.00
502.83
432.26
369.29
469.36
411.57
357.48
K
e
(L/mg)
0.07
0.05
0.04
0.04
0.02
0.01
0.30
0.19
0.14
0.17
0.08
0.06
r
2
0.982
0.979
0.967
0.998
0.998
0.995
0.996
0.979
0.988
0.984
0.987
0.991
χ
2
38.79
21.07
44.34
2.84
4.26
6.34
7.04
47.18
25.02
16.23
10.28
5.28
Redlich-
Peterson
A (L/g)
67.32
41.23
259.32
15.61
7.56
7.56
169.51
190.86
88.98
111.41
43.16
29.22
K
R
(L/mg)
γ
1.00
1.00
10.18
0.04
0.02
0.02
0.42
1.18
0.52
0.40
0.20
0.16
0.70
0.65
0.60
1.00
1.00
1.00
0.93
0.73
0.81
0.87
0.86
0.86
γ
r
2
0.999
0.999
0.999
0.998
0.998
0.995
0.997
0.996
0.997
0.992
0.992
0.996
χ
2
0.58
0.44
0.36
2.84
4.26
6.34
8.12
11.40
5.93
11.87
8.91
3.97
Source
: Inbaraj et al. 2006a; 2008.
a
Dye concentration range: 10-200 mg/L; γ-PGA dose: 0.4 g/L for Au-O, Rh-B, Sa-O and 0.3 g/L for BB-Y.
