Table 5 Empirical design based on CCD applied in this paper.

From: Separation of copper ions by nanocomposites using adsorption process

Source

Sum of squares

df

Mean square

F value

p value a

Model

1.954E+005

8

24,425.03

222.48

 < 0.0001

X1

2656.51

1

2656.51

24.20

 < 0.0001

X2

1.886E+005

1

1.886E+005

1717.88

 < 0.0001

X3

0.26

1

0.26

2.372E−003

0.9616

X4

677.34

1

677.34

6.17

0.0215

X1X2

1269.14

1

1269.14

11.56

0.0027

X12

576.72

1

576.72

5.25

0.0323

X22

742.37

1

742.37

6.76

0.0167

X42

658.87

1

658.87

6.00

0.0231

Residual

2305.45

21

109.78

  

Lack of fit

2303.68

16

143.98

407.11

 < 0.0001

Pure error

1.77

5

0.35

  
  1. aYObs = Observed magnitudes of the secondary concentration of Cu (II) (mg L−1), YPre = Predicted values (mg L−1).
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