Table 4 Comparison of the PFO and PSO rate constants and calculated parameters for different initial DB86 dye concentrations.

From: Adsorption of Acid Yellow 36 and direct blue 86 dyes to Delonix regia biochar-sulphur

Parameter

PFOM

PSOM

DRB-S Dosage

DB86

(ppm)

qe (exp.)

qe (calc.)

k1

R2

qe (calc.)

k2 × 103

h

R2

0.75 g L–1

50

12.99

11.70

18.19

0.994

17.06

1.14

330.71

0.996

75

16.65

18.43

22.57

0.990

24.04

0.63

363.54

0.997

100

20.71

22.43

20.04

0.943

30.77

0.43

406.92

0.992

125

22.56

26.22

19.81

0.955

35.84

0.30

386.92

0.973

150

23.07

21.19

12.44

0.992

33.44

0.34

382.66

0.927

1.0 g L–1

50

10.26

7.60

24.64

0.998

11.81

3.69

514.32

1.000

75

13.52

10.30

23.95

0.990

15.48

2.78

666.93

0.999

100

15.85

9.67

18.19

0.989

17.67

2.64

823.93

0.996

125

17.24

14.64

27.87

0.979

19.76

2.28

890.08

0.999

150

18.52

17.68

24.41

0.960

22.47

1.31

663.44

0.995

1.25 g L–1

50

8.46

3.72

26.02

0.973

8.98

11.68

940.82

1.000

75

10.99

5.50

29.48

0.984

11.76

7.48

1034.98

1.000

100

12.85

4.25

13.82

0.868

13.33

11.18

1986.89

0.999

125

14.70

3.32

20.27

0.790

15.17

7.55

1738.53

0.997

150

15.15

4.64

23.26

0.952

15.75

9.39

2329.37

1.000

1.5 g L–1

50

7.19

1.64

11.28

0.927

7.30

19.74

1053.52

0.997

75

9.36

2.46

24.64

0.989

9.65

19.97

1860.81

1.000

100

10.84

2.65

20.73

0.894

11.17

15.72

1963.09

1.000

125

12.46

3.59

15.66

0.919

12.87

9.63

1595.91

0.999

150

13.11

4.34

16.58

0.964

13.64

7.90

1470.37

0.998

1.75 g L–1

50

7.11

2.38

13.36

0.964

7.38

12.58

684.98

0.994

75

9.16

2.15

15.20

0.964

9.38

16.57

1457.94

0.998

100

10.60

2.67

19.11

0.982

10.91

15.23

1810.94

0.999

125

11.69

2.26

20.04

0.975

11.93

19.52

2779.32

1.000

150

13.02

2.90

25.79

0.984

13.33

18.32

3256.27

1.000

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