Table 5 Comparison of the first- and second-order adsorption rate constants and calculated and experimental qe values for various initial Cr6+ ions and CAC-IO concentrations.

From: Synthesis and characterization of iron oxide-commercial activated carbon nanocomposite for removal of hexavalent chromium (Cr6+) ions and Mordant Violet 40 (MV40) dye

Parameter

Pseudo-first-order

Pseudo-second-order

CAC-IO (g L−1)

Cr6+ (mg L−1)

qe (exp.)

qe (calc.)

k1 × 103

R2

qe (calc.)

k2 × 103

h

R2

1.0

100

76.20

15.38

13.130

0.954

76.92

2.70

15.95

0.999

150

104.36

24.01

11.520

0.938

105.26

1.73

19.16

0.998

200

124.10

28.32

17.500

0.984

125.00

1.61

25.19

0.998

300

177.48

43.28

21.650

0.955

166.67

0.60

16.78

0.982

400

216.05

8.26

1.380

0.830

212.77

3.74

169.49

0.999

1.5

100

60.77

15.88

12.900

0.870

61.35

2.43

9.16

0.998

150

79.45

15.81

16.350

0.927

80.00

3.09

19.76

0.999

200

95.84

28.33

17.040

0.910

98.04

1.46

14.03

0.998

300

135.55

19.18

11.980

0.986

135.14

2.20

40.16

0.999

400

165.00

18.08

10.360

0.815

166.67

1.93

53.48

0.999

2.0

100

49.30

5.93

19.580

0.964

49.75

9.04

22.37

1.000

150

71.45

13.31

14.510

0.985

71.94

3.26

16.89

1.000

200

88.49

57.10

50.440

0.961

89.29

2.19

17.45

0.999

300

115.77

21.62

18.190

0.974

117.65

2.10

29.07

1.000

400

148.89

54.09

52.050

0.945

149.25

2.55

56.82

0.999

2.5

100

39.21

2.57

20.270

0.948

39.37

21.43

33.22

1.000

150

58.79

10.10

22.110

0.972

59.52

5.68

20.12

1.000

200

70.79

14.98

13.820

0.980

71.43

2.73

13.95

0.999

300

103.04

18.16

12.670

0.923

104.17

2.06

22.37

0.999

400

126.07

18.87

14.510

0.953

126.58

2.35

37.59

0.999

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