Table 3.

Operational parameters range in the designed experiments and actual and predicted results in terms of naproxen removal.

Run	Factor 1	Factor 2	Factor 3	Factor 4	Response
	A:NPX concentration	B:Time	C:pH	D:catalyst concentration	Naproxen Removal
					Actual Value	Predicted Value
	mg/L	min	–	g/L	%	%
1	10	90	3	0.1	87.3	87.6
2	10	90	9	0.5	96.8	97.2
3	30	90	9	0.1	72.1	72.8
4	10	60	6	0.3	92.3	91.8
5	20	60	3	0.3	88.8	89.1
6	20	60	6	0.3	89.8	89.9
7	20	60	6	0.3	90.5	89.9
8	20	60	6	0.3	89	89.9
9	30	90	3	0.5	95.4	95.3
10	20	60	6	0.1	86.8	86.1
11	30	30	9	0.5	79.2	79.2
12	10	30	9	0.5	88.9	88.9
13	10	30	3	0.5	93.5	93.1
14	10	90	3	0.5	100	100
15	20	60	6	0.3	89.6	89.9
16	30	30	9	0.1	66.1	65.8
17	30	30	3	0.1	73.8	73.8
18	10	30	9	0.1	77.5	77.8
19	30	90	3	0.1	79.9	79.7
20	30	30	3	0.5	89.6	89.5
21	30	60	6	0.3	82.8	83.0
22	10	30	3	0.1	80.5	80.5
23	10	90	9	0.1	86.5	86.3
24	20	60	6	0.3	90.2	89.9
25	20	60	6	0.3	89.3	89.9
26	30	90	9	0.5	86.3	86.1
27	20	30	6	0.3	83.8	84.1
28	20	60	9	0.3	83.8	83.2
29	20	60	6	0.5	99.8	100
30	20	90	6	0.3	92.1	91.4

Significant values are in bold.