Table 2.

Experimental design matrix and dependent variables attributed to the factors used for the BBD

Run no.	IR (g/g)		Activation time (min)		Activation temperature (°C)		Removal efficiency (%)
	X1		X2		X3		Y1
	Coded	Actual	Coded	Actual	Coded	Actual	Observed	Predicted
1	− 1	0.10	− 1	105	0	80	30.75	35.53
2	1	1.00	− 1	105	0	80	73.00	70.78
3	− 1	0.10	1	105	0	500	18.50	20.72
4	1	1.00	1	105	0	500	91.50	86.72
5	− 1	0.10	0	30	− 1	290	35.50	32.41
6	1	1.00	0	30	− 1	290	81.50	85.41
7	− 1	0.10	0	180	1	290	43.50	39.59
8	1	1.00	0	180	1	290	84.75	87.84
9	0	0.55	− 1	30	− 1	80	24.50	22.81
10	0	0.55	1	30	− 1	500	31.00	31.87
11	0	0.55	− 1	180	1	80	37.00	36.12
12	0	0.55	1	180	1	500	26.50	28.19
13	0	0.55	0	105	0	290	47.50	46.10
14	0	0.55	0	105	0	290	42.00	46.10
15	0	0.55	0	105	0	290	47.50	46.10
16	0	0.55	0	105	0	290	48.50	46.10
17	0	0.55	0	105	0	290	45.00	46.10