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Table 2

Test design and response values for RSM

Trial	A	B	C	ZnO-NP removal rate (%)
1	−1	−1	0	91.78
2	1	−1	0	94.21
3	−1	1	0	92.04
4	1	1	0	94.46
5	−1	0	−1	89.13
6	1	0	−1	89.89
7	−1	0	1	94.60
8	1	0	1	95.11
9	0	−1	−1	90.91
10	0	1	−1	89.89
11	0	−1	1	93.45
12	0	1	1	94.85
13	0	0	0	98.91
14	0	0	0	99.17
15	0	0	0	97.50
16	0	0	0	98.91
17	0	0	0	99.17

Trial	A	B	C	ZnO-NP removal rate (%)
1	−1	−1	0	91.78
2	1	−1	0	94.21
3	−1	1	0	92.04
4	1	1	0	94.46
5	−1	0	−1	89.13
6	1	0	−1	89.89
7	−1	0	1	94.60
8	1	0	1	95.11
9	0	−1	−1	90.91
10	0	1	−1	89.89
11	0	−1	1	93.45
12	0	1	1	94.85
13	0	0	0	98.91
14	0	0	0	99.17
15	0	0	0	97.50
16	0	0	0	98.91
17	0	0	0	99.17