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Table 1 Range of the variables and the designed experiments as well as the corresponding responses for the PS process ([PQ] = 30 mgL−1, T = 25 °C)

From: Degradation of paraquat herbicide using hybrid AOP process: statistical optimization, kinetic study, and estimation of electrical energy consumption

Variables Range and level
\(-\alpha\) \(-1\) \(0\) \(+1\) \(+\alpha\)
A: S2O82− (mg L−1) 64.77 150 275 400 485.22
B: pH 2.29 4 6.5 9 10.70
C: TiO2 (mg L−1) 15.91 50 100 150 184.09
Design matrix
Runs Factors DE (%)
S2O82− (mgL−1) pH TiO2 (mgL−1) (Exp.) (Pred.)
1 150.0 4.0 50.0 44.8 43.8
2 275.0 6.5 100.0 64.0 62.4
3 150.0 9.0 150.0 53.3 51.7
4 275.0 6.5 100.0 62.7 62.4
5 400.0 9.0 50.0 72.0 72.4
6 275.0 6.5 100.0 63.5 62.4
7 485.2 6.5 100.0 83.2 84.5
8 150.0 4.0 150.0 49.3 46.5
9 150.0 9.0 50.0 47.2 49.0
10 275.0 10.7 100.0 61.9 60.0
11 275.0 2.3 100.0 53.1 56.0
12 64.80 6.5 100.0 36.5 40.4
13 275.0 6.5 100.0 62.7 62.4
14 275.0 6.5 184.1 62.4 64.7
15 275.0 6.5 100.0 64.0 62.4
16 400.0 9.0 150.0 73.1 75.1
17 400.0 4.0 50.0 73.1 72.9
18 275.0 6.5 100.0 62.7 62.4
19 275.0 6.5 15.9 60.8 60.2
20 400.0 4.0 150.0 77.1 75.6