Table 2 Results of analysis of variance of the degradation of CR by NiCo2S4/Ch nanocomposite.

From: RSM approach for process optimization of the photodegradation of congo red by a novel NiCo2S4/chitosan photocatalyst

Source

Sum of squares

Degree of freedom (Df)

Mean square

F-value

P-value

 

Model

2600.5

14

185.75

219.11

 < 0.0001

Significant

A-pH

20.2

1

20.2

23.83

0.0002

 

B-Catalyst dosage

54.54

1

54.54

64.34

 < 0.0001

 

C-Dye conc

112.84

1

112.84

133.11

 < 0.0001

 

D-Time

716.1

1

716.1

844.72

 < 0.0001

 

AB

1.76

1

1.76

2.07

0.1707

 

AC

0.4624

1

0.4624

0.5455

0.4716

 

AD

0.0992

1

0.0992

0.117

0.737

 

BC

1.4

1

1.4

1.66

0.2176

 

BD

4.37

1

4.37

5.15

0.0384

 

CD

2.27

1

2.27

2.67

0.1229

 

A2

95.6

1

95.6

112.78

 < 0.0001

 

B2

116.28

1

116.28

137.17

 < 0.0001

 

C2

71.29

1

71.29

84.09

 < 0.0001

 

D2

825.13

1

825.13

973.34

 < 0.0001

 

Residual

12.72

15

0.8477

   

Lack of Fit

12.72

8

1.59

   

Pure error

0

7

0

   

Cor total

2613.22

29

    

Quadratic summary statics response

R2

Adj R2

Pred R2

Std. Dev

CV %

Adq precision

 

0.995

0.990

0.961

0.920

1.11

43.127

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