Table 3 CCD design for AR18 removal.

From: Acid red 18 removal from aqueous solution by nanocrystalline granular ferric hydroxide (GFH); optimization by response surface methodology & genetic-algorithm

Std

Run

A: pH

B: Dose (g/l)

C: Time (min)

D: AR18 (mg/l)

Ce (mg/l)

RE (%)

Predicted value (%)

22

1

7

1.5

110

55

36.8

33

34.26

21

2

7

1.5

10

55

49.87

9.32

10.62

1

3

5

1

35

32.5

25.1

22.7

22.60

6

4

9

1

85

32.5

30.8

5.23

5.98

29

5

7

1.5

60

55

46.52

15.42

16.56

25

6

7

1.5

60

55

44.8

18.6

16.56

30

7

7

1.5

60

55

44.9

18.3

16.56

23

8

7

1.5

60

10

6.5

34.9

34.12

14

9

9

1

85

77.5

58.5

24.5

21.99

7

10

5

2

85

32.5

11.4

65

62.72

24

11

7

1.5

60

100

40

60

63.34

12

12

9

2

35

77.5

41.9

46

44.39

27

13

7

1.5

60

55

46.6

15.3

16.56

28

14

7

1.5

60

55

46.58

15.31

16.56

11

15

5

2

35

77.5

31.48

59.43

57.42

8

16

9

2

85

32.5

26.8

17.55

18.29

17

17

3

1.5

60

55

20.87

62

63.63

2

18

9

1

35

32.5

31.3

3.69

3.51

18

19

11

1.5

60

55

48.3

12.18

13.10

15

20

5

2

85

77.5

15.72

79.71

78.59

13

21

5

1

85

77.5

41.6

46.31

46.50

9

22

5

1

35

77.5

58.1

25

22.96

5

23

5

1

85

32.5

18.47

43.17

43.48

26

24

7

1.5

60

55

45.96

16.44

16.56

19

25

7

0.5

60

55

51.8

5.81

5.80

10

26

9

1

35

77.5

65.22

15.84

16.86

4

27

9

2

35

32.5

26.12

19.63

18.18

20

28

7

2.5

60

55

27.5

50

52.56

3

29

5

2

35

32.5

18.52

43

44.21

16

30

9

2

85

77.5

40.06

48.3

47.14

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