Table 5.

CCD design of variables and their corresponding experimental and predicted removal of MG and AO.

Run No	Variables					Responses
						%RMG		%RAO
	A	B	C	D	E	Actual	Predicted	Actual	Predicted
1	350	6	8	4	12	63.56	63.75	73.44	73.28
2	350	10	8	4	6	92.97	93.56	87.73	87.81
3	300	8	2	6	9	84.50	83.88	90.62	90.89
4	300	8	6	2	9	77.76	76.28	87.08	87.68
5	300	4	6	6	9	29.18	29.49	38.37	38.97
6	300	8	6	6	9	82.15	82.00	92.25	92.43
7	250	6	4	4	12	57.62	57.92	61.59	61.28
8	400	8	6	6	9	87.39	86.99	87.85	87.81
9	300	12	6	6	9	62.91	61.99	79.23	78.35
10	350	10	8	8	12	57.86	57.77	96.40	96.98
11	250	6	8	4	6	34.29	34.53	43.91	43.67
12	300	8	6	10	9	43.47	44.35	62.48	61.61
13	300	8	6	6	15	84.06	83.95	89.73	89.33
14	300	8	6	6	9	84.44	82.00	94.26	92.43
15	350	10	4	4	12	98.68	99.33	99.03	99.04
16	300	8	10	6	9	56.85	56.86	74.86	74.31
17	200	8	6	6	9	54.17	53.96	48.06	47.82
18	250	10	8	8	6	37.94	37.90	48.54	49.04
19	300	8	6	6	9	80.94	82.00	90.69	92.43
20	300	8	6	6	9	79.75	82.00	91.37	92.43
21	350	6	4	8	12	85.39	85.15		62.29
22	350	6	4	4	6	52.46	52.90		84.43
23	300	8	6	6	9	82.73	82.00		92.43
24	350	6	8	8	6	27.69	27.39		43.91
25	250	6	8	8	12	46.09	45.65		46.25
26	300	8	6	6	9	81.38	82.00		92.43
27	350	10	4	8	6	58.07	58.23		78.71
28	250	10	4	4	6	75.73	76.43		76.74
29	300	8	6	6	3	58.76	58.27		74.55
30	250	10	8	4	12	56.98	57.43		72.34
31	250	10	4	8	12	56.35	56.37		64.56
32	250	6	4	8	6	39.90	39.71		52.59

A: adsorbent dosage (mg), B: pH of the solution, C: MG concentration (mg L⁻¹), D: AO concentration (mg L⁻¹) and E: sonication time (min).