Research Article
Tartrazine Removal from Aqueous Solution by HDTMA-Br-Modified Colombian Bentonite
Table 2
Factorial design for the independent variables used in this study along with the observed response.
| Test | Code values | Real values | Response | A | B | A (mg) | B (mg/L) | Decolorization, (%) |
| 1 | −1 | −1 | 25 | 30 | 63.72 ± 1.67 | 2 | 0 | −1 | 35 | 30 | 99.99 ± 0.01 | 3 | 1 | −1 | 45 | 30 | 99.99 ± 0.02 | 4 | −1 | 0 | 25 | 40 | 50.36 ± 0.38 | 5 | 0 | 0 | 35 | 40 | 71.02 ± 0.68 | 6 | 1 | 0 | 45 | 40 | 87.59 ± 1.44 | 7 | −1 | 1 | 25 | 50 | 32.82 ± 0.36 | 8 | 0 | 1 | 35 | 50 | 49.58 ± 0.84 | 9 | 1 | 1 | 45 | 50 | 46.50 ± 0.61 |
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