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Table 5 The experimental and predicted value of Cr (VI)

From: Optimization of Cr (VI) removal from aqueous solution with activated carbon derived from Eichhornia crassipes under response surface methodology

Run

pH

Contact time (min)

Dose (g/200 mL)

Initial concentration (mg/L)

Cr (VI) Removal (%)

Predicted Cr (VI) Removal (%)

1

5

90

3

2.25

95.57

95.65

2

6

90

2

2.25

89.67

90.05

3

5

60

2

2.25

92.14

92.55

4

6

60

3

4

79.87

79.85

5

5

90

1

2.25

94.04

94.81

6

5

90

2

0.5

95.27

94.76

7

4

120

1

0.5

85.89

86.03

8

4

60

1

0.5

81.49

81.03

9

4

120

1

4

78.49

78.51

10

6

120

1

0.5

83.21

83.36

11

6

120

3

4

78.54

78.67

12

5

90

2

2.25

98.37

97.59

13

5

90

2

2.25

98.37

97.59

14

6

120

1

4

75.73

75.03

15

4

90

2

2.25

91.39

91.85

16

5

90

2

2.25

97.88

97.59

17

4

60

1

4

77.95

77.84

18

4

120

3

0.5

83.61

83.34

19

4

120

3

4

80.82

80.69

20

5

90

2

2.25

98.37

97.59

21

6

120

3

0.5

81.89

82.12

22

5

90

2

2.25

97.11

97.59

23

4

60

3

4

81.24

80.76

24

6

60

1

0.5

79.21

79.46

25

5

90

2

2.25

97.97

97.59

26

6

60

3

0.5

79.33

78.97

27

4

60

3

0.5

78.25

79.08

28

5

90

2

4

90.08

91.44

29

5

120

2

2.25

94.03

94.46

30

6

60

1

4

75.53

75.47