Table 2 Langmuir and Freundlich isotherm parameters obtained for Cr6+ and Pb2+ adsorption on L-Cyst-Fe3O4 NPs.

From: Lead and Chromium Adsorption from Water using L-Cysteine Functionalized Magnetite (Fe3O4) Nanoparticles

Isotherm constants

Pb2+

Cr6+

25 °C

35 °C

45 °C

25 °C

35 °C

45 °C

Langmuir

qmax (mg/g)

7.00

11.60

18.80

11.66

23.48

34.48

b (L/mg)

14.26

8.72

5.45

8.79

5.23

4.14

R2

0.956

0.987

0.991

0.971

0.984

0.986

Freundlich

KF (mg/g)

19.16

23.88

31.19

25.98

30.27

41.05

n

3.07

3.22

3.74

1.44

3.03

3.41

R2

0.982

0.995

0.990

0.994

0.966

0.914

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