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Table 5 Parameters of the isotherm models for the adsorption of U(VI) ions on the P-HAP

From: Adsorption of Uranyl Ions at the Nano-hydroxyapatite and Its Modification

Model

Parameter

293 K

313 K

333 K

Langmuir–Freundlich

K L-F (dm3 × mol−1)

220.73

1748.3

1222.2

n

0.422

0.392

0.281

A (mol × g−1)

3.26 × 10−2

3.5 × 10−2

3.32 × 10−2

R 2

0.9494

0.9489

0.9255

Dubinin–Radushkevich

K D-R (mol2/kJ2)

2.96 × 10−9

2.08 × 10−9

1.21 × 10−9

Q m (mol × g−1)

1.12 × 10−3

2.75 × 10−3

1.19 × 10−3

E n (kJ × mol−1)

12.99

15.5

16.33

R 2

0.9898

0.9655

0.9267

Freundlich

K F (dm3 × mol−1)

4.35

2.34

0.815

n

0.38

0.32

0.21

R 2

0.9494

0.9498

0.9259

  1. R 2 correlation

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