Table 3.

Batch mode adsorption process parameters used in RSM with the equivalent experimental and predicted values for the response.

Independent variables Cd removal efficiency (%, η)
Std	Run	A	B	C	D	Efficiency	Predicted
19	1	75	0.25	5.5	50	74	73.65
15	2	50	1.75	6	60	94	95.39
6	3	100	0.75	6	40	78.5	79.18
18	4	125	1.25	5.5	50	77	76.35
16	5	100	1.75	6	60	92.3	92.47
3	6	50	1.75	5	40	94.5	95.89
4	7	100	1.75	5	40	90.3	90.07
30	8	75	1.25	5.5	50	98	97.25
27	9	75	1.25	5.5	50	96.5	97.25
14	10	100	0.75	6	60	81.5	81.37
17	11	25	1.25	5.5	50	87.9	88.06
29	12	75	1.25	5.5	50	97.5	97.25
26	13	75	1.25	5.5	50	97.5	97.25
25	14	75	1.25	5.5	50	96.5	97.25
2	15	100	0.75	5	40	74.6	74.47
1	16	50	0.75	5	40	84.2	83.27
13	17	50	0.75	6	60	87.8	87.27
7	18	50	1.75	6	40	97.3	95.95
28	19	75	1.25	5.5	50	97.5	97.25
23	20	75	1.25	5.5	30	91.9	91.88
9	21	50	0.75	5	60	84.8	85.70
21	22	75	1.25	4.5	50	88	87.93
20	23	75	2.25	5.5	50	97.5	97.36
8	24	100	1.75	6	40	92.3	92.65
5	25	50	0.75	6	40	84.7	85.45
24	26	75	1.25	5.5	70	94.6	94.13
11	27	50	1.75	5	60	97.4	95.95
22	28	75	1.25	6.5	50	92.5	92.08
12	29	100	1.75	5	60	90	90.50
10	30	100	0.75	5	60	76.7	77.28