Column Adsorption Studies for the Removal of Cr(VI) Ions by Ethylamine Modified Chitosan Carbonized Rice Husk Composite Beads with Modelling and Optimization
Table 5
Analysis of variance (ANOVA) for response surface quadratic model for percentage removal of Cr(VI) using EAM-CCRCBs.
Source
Sum of squares
Df
Mean square
value
value
Comments
Model
4219.31
9
468.81
43.48
<0.0001
Significant
2183.23
1
2183.23
202.50
<0.0001
556.02
1
556.02
51.51
<0.0001
743.93
1
743.93
69.000
<0.0001
29.26
1
29.26
2.71
0.1305
30.81
1
30.81
2.86
0.1218
2.31
1
2.31
0.21
0.6533
558.93
1
558.93
51.84
<0.0001
213.44
1
213.44
19.80
0.0012
120.58
1
120.58
11.18
0.0074
Residual
107.81
10
10.78
Lack of fit
107.37
5
21.47
244.03
<0.0001
Significant
Pure error
0.44
5
0.088
Cor total
4327.12
19
Where is the fisher value which is the ratio of mean square of the term to the mean square of the residual, and is low-probability value.
