Table 10 ANOVA analysis values determined by Box-Behnken design for influential variables in Cu2+ ion removal.
Source | Sum of squares | df | Mean square | F-value | p-value | |
|---|---|---|---|---|---|---|
Model | 4896.82 | 9 | 544.09 | 1023.71 | < 0.0001 | Significant |
A-NSM dose | 1151.28 | 1 | 1151.28 | 2166.14 | < 0.0001 | |
B-Time | 47.24 | 1 | 47.24 | 88.88 | < 0.0001 | |
C-Cu dose | 2378.78 | 1 | 2378.78 | 4475.68 | < 0.0001 | |
AB | 4.58 | 1 | 4.58 | 8.62 | 0.0219 | |
AC | 456.46 | 1 | 456.46 | 858.84 | < 0.0001 | |
BC | 1.02 | 1 | 1.02 | 1.92 | 0.2085 | |
A2 | 157.51 | 1 | 157.51 | 296.36 | < 0.0001 | |
B2 | 296.30 | 1 | 296.30 | 557.49 | < 0.0001 | |
C2 | 315.86 | 1 | 315.86 | 594.30 | < 0.0001 | |
Residual | 3.72 | 7 | 0.5315 | |||
Lack of fit | 3.72 | 3 | 1.24 | |||
Pure error | 0.0000 | 4 | 0.0000 | |||
Cor total | 4900.54 | 16 | ||||
Std. Dev. | 0.7290 | R2 | 0.9992 | |||
Mean | 82.60 | Adjusted R2 | 0.9983 | |||
C.V. % | 0.8826 | Predicted R² | 0.9879 | |||
Adeq precision | 104.5887 |
