Run no. X1(w) X2(Co) X3(pH) X4(T) % biosorption of cobalt
Experimental Predicted
1 -1.0000 -1.0000 -1.0000 -1.0000 93.18 93.21
2 -1.0000 -1.0000 -1.0000 1.0000 93.67 93.65
3 -1.0000 -1.0000 1.0000 -1.0000 93.19 93.18
4 -1.0000 -1.0000 1.0000 1.0000 93.59 93.60
5 -1.0000 1.0000 -1.0000 -1.0000 92.2 92.21
6 -1.0000 1.0000 -1.0000 1.0000 92.79 92.82
7 -1.0000 1.0000 1.0000 -1.0000 92.89 92.91
8 -1.0000 1.0000 1.0000 1.0000 93.51 93.50
9 1.0000 -1.0000 -1.0000 -1.0000 93.8 93.78
10 1.0000 -1.0000 -1.0000 1.0000 94.17 94.20
11 1.0000 -1.0000 1.0000 -1.0000 93.29 93.31
12 1.0000 -1.0000 1.0000 1.0000 93.74 93.71
13 1.0000 1.0000 -1.0000 -1.0000 91.98 92.01
14 1.0000 1.0000 -1.0000 1.0000 92.62 92.60
15 1.0000 1.0000 1.0000 -1.0000 92.28 92.27
16 1.0000 1.0000 1.0000 1.0000 92.83 92.84
17 -2.0000 0.0000 0.0000 0.0000 94.34 94.30
18 2.0000 0.0000 0.0000 0.0000 94.21 94.20
19 0.0000 -2.0000 0.0000 0.0000 94.13 94.12
20 0.0000 2.0000 0.0000 0.0000 92.28 92.25
21 0.0000 0.0000 -2.0000 0.0000 90.71 90.67
22 0.0000 0.0000 2.0000 0.0000 90.89 90.88
23 0.0000 0.0000 0.0000 -2.0000 93.77 93.73
24 0.0000 0.0000 0.0000 2.0000 94.75 94.74
25 0.0000 0.0000 0.0000 0.0000 95.6 95.60
26 0.0000 0.0000 0.0000 0.0000 95.6 95.60
27 0.0000 0.0000 0.0000 0.0000 95.6 95.60
28 0.00000 0.0000 0.0000 0.0000 95.6 95.60
29 0.00000 0.0000 0.0000 0.0000 95.6 95.60
30 0.00000 0.0000 0.0000 0.0000 95.6 95.60
Experimental conditions [Coded Values] and observed response values of central composite design with 24 factorial runs, 6- central points and 8- axial points. Agitation time fixed at 60 min and biosorbent size at 63 μm
Table 5: Results from CCD for cobalt biosorption by Casuarina leaf powder.