Modeling and Optimization for Production of Rice Husk Activated Carbon and Adsorption of Phenol

Table 1

Design matrix for the factors and respective response from experiment.

Run	Type	Coded factors			Uncoded factors			Responses
		(^°C)	(mg/L)	(g)	(^°C)	(mg/L)	(g)	(%)	(mg/g)
1	Factorial	−1	1	−1	300	50	2	88.32	2.21
2	Factorial	1	1	1	500	50	4	94.70	1.18
3	Factorial	1	1	−1	500	50	2	95.72	2.39
4	Axial	1	0	0	500	30	3	93.86	0.94
5	Center	0	0	0	400	30	3	90.47	0.91
6	Axial	−1	0	0	300	30	3	82.57	0.83
7	Center	0	0	0	400	30	3	90.47	0.91
8	Factorial	−1	1	1	300	50	4	94.17	1.18
9	Axial	0	1	0	400	50	3	93.47	1.56
10	Center	0	0	0	400	30	3	90.47	0.91
11	Axial	0	−1	0	400	10	3	75.79	0.25
12	Axial	0	0	1	400	30	4	93.68	0.70
13	Factorial	−1	−1	−1	300	10	2	56.49	0.28
14	Factorial	1	−1	−1	500	10	2	78.25	0.39
15	Center	0	0	0	400	30	3	90.47	0.91
16	Factorial	−1	−1	1	300	10	4	71.93	0.18
17	Center	0	0	0	400	30	3	90.47	0.91
18	Center	0	0	0	400	30	3	90.47	0.91
19	Axial	0	0	−1	400	30	2	88.42	1.33
20	Factorial	1	−1	1	500	10	4	85.79	0.21