Table 4 ANOVA results of RSM.

From: Ultrahigh and kinetic-favorable adsorption for recycling urea using corncob-derived porous biochar

Source

Sum of Squares

Df*

Mean Square

F Value

p-value Probability > F

Significant*

Model

68,199.60

9

7577.73

6.03

0.0136

significant

A

26,059.82

1

26,059.82

20.73

0.0026

 

B

12,228.27

1

12,228.27

9.73

0.0169

 

C

8337.47

1

8337.47

6.63

0.0367

 

AB

1117.16

1

1117.16

0.8888

0.3772

 

AC

5258.55

1

5258.55

4.18

0.0801

 

BC

4153.45

1

4153.45

3.30

0.1119

 

A2

3504.78

1

3504.78

2.79

0.1389

 

B2

6965.79

1

6965.79

5.45

0.0508

 

C2

9.46

1

9.46

0.0075

0.9333

 

Residual

8798.31

7

1256.90

   

Lack of Fit

8798.31

3

2932.77

   

Pure Error

0

4

0

   

Cor Total

76,997.91

16

    
  1. *Df degree of freedom; Significant (p < 0.05).