Research Article
Synergistic Removal of Humic Acid in Water by Coupling Adsorption and Photocatalytic Degradation Using TiO2/Coconut Shell Powder Composite
Table 3
Coded and actual levels of variables with experimental and predicted results.
| | Run | pH | TCNSP (g) | Time (min) | Remaining concentration (mg/L) | | Coded value | Actual value | Coded value | Actual value | Coded value | Actual value | Experimental | Predicted |
| | R1 | (−1) | 3 | (1) | 50 | (1) | 50 | 2.01 | 0.07 | | R2 | (−1) | 3 | (1) | 50 | (−1) | 10 | 15.24 | 12.24 | | R3 | (1) | 11 | (−1) | 10 | (1) | 50 | 17.45 | 16.98 | | R4 | (0) | 7 | (0) | 30 | (0) | 30 | 4.55 | 4.41 | | R5 | (0) | 7 | (−α) | 2 | (0) | 30 | 26.54 | 25.76 | | R6 | (1) | 11 | (1) | 50 | (1) | 50 | 9.54 | 5.06 | | R7 | (0) | 7 | (0) | 30 | (0) | 30 | 4.56 | 4.41 | | R8 | (α) | 13 | (0) | 30 | (0) | 30 | 9.15 | 13.09 | | R9 | (0) | 7 | (0) | 30 | (0) | 30 | 4.61 | 4.41 | | R10 | (0) | 7 | (0) | 30 | (0) | 30 | 4.48 | 4.41 | | R11 | (0) | 7 | (0) | 30 | (0) | 30 | 4.55 | 4.41 | | R12 | (1) | 11 | (−1) | 10 | (−1) | 10 | 28.58 | 27.05 | | R13 | (0) | 7 | (0) | 30 | (−α) | 2 | 21.35 | 23.54 | | R14 | (−1) | 3 | (−1) | 10 | (−1) | 10 | 20.14 | 21.15 | | R15 | (−α) | 1 | (0) | 30 | (0) | 30 | 2.98 | 3.94 | | R16 | (−1) | 3 | (−1) | 10 | (1) | 50 | 11.24 | 10.73 | | R17 | (1) | 11 | (1) | 50 | (−1) | 10 | 19.85 | 16.88 | | R18 | (0) | 7 | (0) | 30 | (0) | 30 | 4.56 | 4.41 | | R19 | (0) | 7 | (α) | 30 | (0) | 30 | 2.55 | 8.24 | | R20 | (0) | 7 | (0) | 30 | (α) | 60 | 2.11 | 4.83 |
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