Activated Carbon from Prickly Pear Seed Cake: Optimization of Preparation Conditions Using Experimental Design and Its Application in Dye Removal

Table 2

Doehlert experimental design, experimental conditions, and experimental results.

Exp. No.	Doehlert experimental design			Experimental conditions			Exp. response
	X1	X2	X3	U1	U2	U3	Y
					°C	Min	mg·g^−1
1	1.0000	0.0000	0.0000	3.00	500.00	90.00	234.81
2	−1.0000	0.0000	0.0000	1.00	500.00	90.00	193.15
3	0.5000	0.8660	0.0000	2.50	586.60	90.00	190.42
4	−0.5000	−0.8660	0.0000	1.50	413.40	90.00	143.30
5	0.5000	−0.8660	0.0000	2.50	413.40	90.00	151.09
6	−0.5000	0.8660	0.0000	1.50	586.60	90.00	75.54
7	0.5000	0.2887	0.8165	2.50	528.87	114.50	191.59
8	−0.5000	−0.2887	−0.8165	1.50	471.13	65.50	136.68
9	0.5000	−0.2887	−0.8165	2.50	471.13	65.50	210.28
10	0.0000	0.5774	−0.8165	2.00	557.74	65.50	223.13
11	−0.5000	0.2887	0.8165	1.50	528.87	114.50	100.47
12	0.0000	−0.5774	0.8165	2.00	442.26	114.50	56.07
13	0.0000	0.0000	0.0000	2.00	500.00	90.00	160.53
14	0.0000	0.0000	0.0000	2.00	500.00	90.00	158.10
15	0.0000	0.0000	0.0000	2.00	500.00	90.00	162.77