Table 2.

Experimental design data for batch biosorption of reactive red dye with cactus peel.

Run	Factors				Response
	A: pH	B: conc.(mg/L)	C: dose (g)	D: time (min)	(%) removal
1	3.00	40.00	2.00	40.00	82.68
2	9.00	40.00	2.00	40.00	72.99
3	3.00	80.00	2.00	40.00	67.84
4	9.00	80.00	2.00	40.00	53.37
5	3.00	40.00	6.00	40.00	89.76
6	9.00	40.00	6.00	40.00	84.67
7	3.00	80.00	6.00	40.00	81.73
8	9.00	80.00	6.00	40.00	69.06
9	3.00	40.00	2.00	120.00	91.86
10	9.00	40.00	2.00	120.00	79.25
11	3.00	80.00	2.00	120.00	71.65
12	9.00	80.00	2.00	120.00	42.21
13	3.00	40.00	6.00	120.00	99.43
14	9.00	40.00	6.00	120.00	92.13
15	3.00	80.00	6.00	120.00	87.94
16	9.00	80.00	6.00	120.00	75.38
17	5.70	60.00	4.00	80.00	76.29
18	6.30	60.00	4.00	80.00	70.62
19	6.00	58.00	4.00	80.00	76.27
20	6.00	62.00	4.00	80.00	71.68
21	6.00	60.00	3.80	80.00	69.82
22	6.00	60.00	4.20	80.00	74.56
23	6.00	60.00	4.00	76.00	67.74
24	6.00	60.00	4.00	84.00	70.49
25	6.00	60.00	4.00	80.00	73.07
26	6.00	60.00	4.00	80.00	73.09