Table 4 Fitting parameters of Pb(II), Cd(II), Cu(II) and Zn(II) adsorption isotherms on the adsorbents using Langmuir isotherm model.

From: Enhanced removal of heavy metal ions from aqueous solution using manganese dioxide-loaded biochar: Behavior and mechanism

Sorbents

Langmuir isotherm model

b (L g−1)

qm (mg g−1)

Qm (mg gMnO2−1)

R2

BC

Pb(II)

0.02

82.50

—

0.998

Cd(II)

0.18

26.51

—

0.994

Cu(II)

0.02

19.14

—

0.985

Zn(II)

0.02

15.14

—

0.976

BC@MnO2-12.3

Pb(II)

0.12

216.22

1757.89

0.996

Cd(II)

0.86

66.48

540.49

0.984

Cu(II)

0.11

48.90

397.56

0.995

Zn(II)

0.07

31.25

254.07

0.998

BC@MnO2-18.4

Pb(II)

0.19

255.45

1388.32

0.994

Cd(II)

0.64

100.76

547.61

0.976

Cu(II)

0.03

72.28

392.83

0.991

Zn(II)

0.03

44.40

392.83

0.993

BC@MnO2-26.3

Pb(II)

0.27

298.27

1134.11

0.992

Cd(II)

0.50

127.95

486.50

0.976

Cu(II)

0.06

91.67

348.56

0.996

Zn(II)

0.22

56.60

215.21

0.963

BC@MnO2-30.2

Pb(II)

0.49

351.37

1163.48

0.986

Cd(II)

0.62

151.43

501.42

0.983

Cu(II)

0.06

103.91

344.07

0.998

Zn(II)

0.23

68.36

226.36

0.983

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