Table 2 Box–Behnken design (BBD) for adsorption rate of four different eggshells in 3-level-3-factor.
Treatment | Eggshell (ES) | Eggshell membrane (ESM) | Eggshell with a membrane (ESWM) | Calcined eggshell (CES4) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Coded level of factor | Y (%) | Coded level of factor | Y (%) | Coded level of factor | Y (%) | Coded level of factor | Y (%) | |||||||||
Reaction time (h) | Concentration (mg/L) | Adsorption dose (g) | Adsorption rate | Reaction time (h) | Concentration (mg/L) | Adsorption dose (g) | Adsorption rate | Reaction time (h) | Concentration (mg/L) | Adsorption dose (g) | Adsorption rate | Reaction time (h) | Concentration (mg/L) | Adsorption dose (g) | Adsorption rate | |
1 | 0 (24) | 1 (75) | − 1 (1.0) | 93.3 | 1 (36) | 0 (50) | − 1 (100) | 40.9 | 0 (24) | 0 (50) | 0 (1.5) | 26.3 | 0 (40) | − 1 (100) | − 1 (1.0) | 98 |
2 | − 1 (12) | − 1 (25) | 0 (1.5) | 61.5 | 1 (36) | − 1 (25) | 0 (150) | 35.7 | − 1 (12) | − 1 (25) | 0 (1.5) | 22.2 | − 1 (20) | 0 (150) | − 1 (1.0) | 97.3 |
3 | − 1 (12) | 1 (75) | 0 (1.5) | 73.7 | 0 (24) | 0 (50) | 0 (150) | 47.4 | − 1 (12) | 0 (50) | − 1 (1.0) | 57.9 | 1 (60) | 0 (150) | 1 (19.0) | 100 |
4 | 1 (36) | − 1 (25) | 0 (1.5) | 66.7 | 0 (24) | 0 (50) | 0 (150) | 42.1 | 0 (24) | − 1 (25) | − 1 (1.0) | 11.1 | 0 (40) | 0 (150) | 0 (10.0) | 98.6 |
5 | − 1 (12) | 0 (50) | 1 (2.0) | 50 | 0 (24) | 0 (50) | 1 (200) | 47.4 | 0 (24) | 0 (50) | 0 (1.5) | 31.6 | 0 (40) | − 1 (100) | 1 (19.0) | 100 |
6 | − 1 (12) | 0 (50) | − 1 (1.0) | 66.7 | 0 (24) | 1 (75) | 1 (200) | 62.5 | 0 (24) | 0 (50) | 0 (1.5) | 36.8 | 1 (60) | 0 (150) | − 1 (1.0) | 98.6 |
7 | 0 (24) | − 1 (25) | 1 (2.0) | 30.8 | 1 (36) | 0 (50) | 1 (200) | 50 | 0 (24) | 1 (75) | 1 (2.0) | 64.9 | 1 (60) | 1 (200) | 0 (10.0) | 98.6 |
8 | 0 (24) | 0 (50) | 0 (1.5) | 80 | 0 (24) | − 1 (25) | − 1 (100) | 55.6 | 1 (36) | 1 (75) | 0 (1.5) | 54.1 | − 1 (20) | 0 (150) | 1 (19.0) | 100 |
9 | 1 (36) | 1 (75) | 0 (1.5) | 79.5 | 0 (24) | − 1 (25) | 0 (150) | 22.2 | 1 (36) | 0 (50) | 1 (2.0) | 63.2 | 0 (40) | 1 (200) | 1 (19.0) | 100 |
10 | 0 (24) | 0 (50) | 0 (1.5) | 64 | 0 (24) | 1 (75) | − 1 (100) | 43.8 | − 1 (12) | 1 (75) | 0 (1.5) | 62.2 | 1 (60) | − 1 (100) | 0 (10.0) | 100 |
11 | 1 (36) | 0 (50) | − 1 (1.0) | 33.3 | 1 (36) | 1 (75) | 0 (150) | 57.9 | − 1 (12) | 0 (50) | 1 (2.0) | 68.4 | 0 (40) | 0 (150) | 0 (10.0) | 97.3 |
12 | 1 (36) | 0 (50) | 1 (2.0) | 48.1 | − 1 (12) | − 1 (25) | 0 (150) | 36.4 | 0 (24) | 1 (75) | − 1 (1.0) | 62.2 | 0 (40) | 1 (200) | − 1 (1.0) | 86.7 |
13 | 0 (24) | − 1 (25) | − 1 (1.0) | 42.9 | − 1 (12) | 0 (50) | − 1 (100) | 34.8 | 0 (24) | − 1 (25) | 1 (2.0) | 11.1 | − 1 (20) | − 1 (100) | 0 (10.0) | 100 |
14 | 0 (24) | 0 (50) | 0 (1.5) | 80 | − 1 (12) | 0 (50) | 1 (200) | 47.8 | 1 (36) | − 1 (25) | 0 (1.5) | 11.1 | − 1 (20) | 1 (200) | 0 (10.0) | 99 |
15 | 0 (24) | 1 (75) | 1 (2.0) | 84.8 | − 1 (12) | 1 (75) | 0 (150) | 70.3 | 1 (36) | 0 (50) | − 1 (1.0) | 42.8 | 0 (40) | 0 (150) | 0 (10.0) | 100 |
