Table 3.
ANOVA results for MG adsorption onto the GO–ZnO nanohybrid.
| Source of variation | SS | DF | MS | F value | P value |
|---|---|---|---|---|---|
| Model | 13,230 | 20 | 661.4 | 184.7 | < 0.0001 |
| X1 | 419.1 | 1 | 419.1 | 117.1 | < 0.0001 |
| X2 | 5719 | 1 | 5719 | 1598 | < 0.0001 |
| X3 | 1479 | 1 | 1479 | 413.2 | < 0.0001 |
| X4 | 381.9 | 1 | 381.9 | 106.7 | < 0.0001 |
| X5 | 622.1 | 1 | 622.1 | 173.8 | < 0.0001 |
| X1 × 2 | 17.66 | 1 | 17.66 | 4.933 | 0.04828 |
| X1 × 3 | 596.7 | 1 | 596.7 | 166.7 | < 0.0001 |
| X1 × 4 | 63.4 | 1 | 63.4 | 17.71 | 0.0015 |
| X1 × 5 | 2.747 | 1 | 2.747 | 0.767 | 0.3998 |
| X2 × 3 | 53.47 | 1 | 53.47 | 14.94 | 0.0026 |
| X2 × 4 | 297.6 | 1 | 297.6 | 83.14 | < 0.0001 |
| X2 × 5 | 17.04 | 1 | 17.04 | 4.759 | 0.0517 |
| X3 × 4 | 184.6 | 1 | 184.6 | 51.57 | < 0.0001 |
| X3 × 5 | 315.7 | 1 | 315.7 | 88.18 | < 0.0001 |
| X4 × 5 | 949.7 | 1 | 949.7 | 265.3 | < 0.0001 |
| X12 | 22.61 | 1 | 22.61 | 6.315 | 0.02883 |
| X22 | 894.8 | 1 | 894.8 | 249.9 | < 0.0001 |
| X32 | 973.8 | 1 | 973.8 | 272 | < 0.0001 |
| X42 | 187.7 | 1 | 187.7 | 52.43 | < 0.0001 |
| X52 | 343.7 | 1 | 343.7 | 96.01 | < 0.0001 |
| Residual | 39.38 | 11 | 3.58 | ||
| Lack of Fit | 33.28 | 6 | 5.546 | 4.545 | 0.0590 |
| Pure Error | 6.102 | 5 | 1.22 | ||
| Corr. Total | 13,270 | 31 | |||
| Summary statistics of the quadratic model | |||||
| Standard deviation (SD%) | 1.892 | R2 | 0.997 | ||
| Mean | 71.51 | Adjusted-R2 | 0.992 | ||
| Coefficient of variation (C.V. %) | 2.646 | Predicted-R2 | 0.932 | ||
| PRESS | 898.6 | Adequate precision | 60.00 | ||