New Sustainable Biosorbent Based on Recycled Deoiled Carob Seeds: Optimization of Heavy Metals Remediation

Table 7

Factorial experimental design matrix coded, real values, and experimental results of the responses.

Run	Coded values				Actual values				Responses
	A	B	C	D	A	B	C	D	Cd(II)	Co(II)
1	−1	−1	−1	−1	4	1	50	HCl	30.59	24.22
2	+1	−1	−1	−1	6	1	50	HCl	46.21	29.30
3	−1	+1	−1	−1	4	3	50	HCl	19.23	14.48
4	+1	+1	−1	−1	6	3	50	HCl	29.34	18.05
5	−1	−1	+1	−1	4	1	100	HCl	19.56	5.58
6	+1	−1	+1	−1	6	1	100	HCl	38.86	12.36
7	−1	+1	+1	−1	4	3	100	HCl	11.57	8.64
8	+1	+1	+1	−1	6	3	100	HCl	20.92	10.71
9	−1	−1	−1	+1	4	1	50	NaOH	70.11	42.86
10	+1	−1	−1	+1	6	1	50	NaOH	85.73	51.90
11	−1	+1	−1	+1	4	3	50	NaOH	32.10	26.53
12	+1	+1	−1	+1	6	3	50	NaOH	33.48	29.17
13	−1	−1	+1	+1	4	1	100	NaOH	56.32	27.61
14	+1	−1	+1	+1	6	1	100	NaOH	66.89	31.56
15	−1	+1	+1	+1	4	3	100	NaOH	30.11	18.81
16	+1	+1	+1	+1	6	3	100	NaOH	31.80	20.13