Table 6 The ANOVA findings for the MG dye removal by the rGO/-Fe2O3 nanocomposite were obtained using the response surface quadratic model.

From: Response surface methodology for the design of malachite green dye removal by γ-Fe2O3 dispersed on reduced graphene oxide sheets

Source

Sum of Squares

Df

Mean Square

F-value

p-value

Remark

Model

18548.78

14

1324.91

318.44

< 0.0001

Significant

A-Dose

1643.60

1

1643.60

395.04

< 0.0001

 

B-Dye concentration

941.92

1

941.92

226.39

< 0.0001

 

C-pH

12736.27

1

12736.27

3061.16

< 0.0001

 

D-Contact time

437.37

1

437.37

105.12

< 0.0001

 

AB

123.63

1

123.63

29.71

0.0002

 

AC

652.82

1

652.82

156.91

< 0.0001

 

AD

1.10

1

1.10

0.2634

0.6179

 

BC

92.19

1

92.19

22.16

0.0006

 

BD

2.68

1

2.68

0.6442

0.4392

 

CD

144.22

1

144.22

34.66

0.0001

 

A2

548.63

1

548.63

131.86

< 0.0001

 

B2

0.0142

1

0.0142

0.0034

0.9545

 

C2

174.96

1

174.96

42.05

< 0.0001

 

D2

424.50

1

424.50

102.03

< 0.0001

 

Residual

45.77

11

4.16

   

Lack of Fit

45.29

10

4.53

9.58

0.2468

Not Significant

Pure Error

0.4730

1

0.4730

   

Cor Total

18594.55

25

    
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