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Table 5 Analysis of variance (ANOVA) results for the fitted polynomial model for COD removal using photocatalytic process with lamp 30-W

From: Response surface methodology (RSM) modeling to improve removal of ciprofloxacin from aqueous solutions in photocatalytic process using copper oxide nanoparticles (CuO/UV)

Lamp 30

Sum of squares

df

Mean square

F value

p-value

Cipro concentration

359.08

1

359.08

5.46

0.04

CuO dosage

4212.77

1

4212.77

64.02

< 0.0001

pH

1254.09

1

1254.09

19.06

0.0018

pH2

1095.90

1

1095.90

16.65

0.0028

Residual

592.28

9

65.81

  

Lack of fit

453.48

5

90.70

2.61

0.19

Pure error

138.80

4

34.70

  
  1. Adjusted R2: 0.8618, p-value: 0.0096