Table 2 CCD for RSM optimization and response results for the removal of MG dye by rGO/ -Fe₂O₃ nanocomposite.

Run	Factor A	Factor B	Factor C	Factor D	Response (% Removal)
Run	Dose (mg/100 mL)	MG Dye concentration (ppm)	pH	Contact time (min.)	Actual values	Predicted values
1	150	100	6	90	54.91	53.99
2	200	40	8	60	55.39	53.66
3	100	40	8	120	45.36	43.61
4	150	60	2	90	7.96	7.94
5	100	40	4	120	9.39	9.11
6	200	80	4	120	22.02	20.91
7	200	80	8	120	90.73	90.56
8	200	40	4	60	7.89	5.61
9	100	40	8	60	30.17	29.37
10	200	80	4	60	16.21	18.08
11	150	60	6	90	41.55	41.32
12	200	80	8	60	77.37	75.73
13	100	80	8	120	55.84	56.20
14	100	40	4	60	6.59	6.87
15	200	40	8	120	67.10	66.86
16	50	60	6	90	2.54	2.37
17	150	60	6	90	41.39	41.21
18	250	60	6	90	33.49	35.47
19	150	60	6	90	41.69	41.34
20	150	60	6	90	40.86	40.89
21	200	40	4	120	7.23	6.80
22	150	60	6	90	41.83	41.34
23	150	60	6	90	40.86	41.34
24	100	80	4	120	10.24	12.10
25	150	20	6	90	26.21	28.93
26	150	60	6	30	11.26	13.08
27	150	60	10	90	98.25	100.08
28	100	80	8	60	39.78	40.32
29	100	80	4	60	9.89	8.22
30	150	60	6	150	30.18	30.16

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