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