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Table 4 Thermodynamic parameters of NH4+ and NO3− adsorption in single solute solution

From: Chitosan impregnation of coconut husk biochar pellets improves their nutrient removal from eutrophic surface water

Parameter

Temp.

lnKa

∆G (kJ mol− 1)

∆S (kJ K− 1 mol− 1)

∆H (kJ mol− 1)

R2

NH4+

 CH

298

8.1

−20

−0.21

−81

0.486

303

6.1

−15

   

313

6.3

−16

   

 CHC

298

3.1

−8

0.57

163

0.979

303

4.7

−12

   

313

6.4

−17

   

 CHEG

298

7.6

−19

0.51

134

0.873

303

7.5

−19

   

313

10.0

−26

   

NO3−

 CH

298

6.5

−16

0.08

8

0.033

303

5.7

−14

   

313

6.5

−17

   

 CHC

298

4.2

−10

0.87

246

0.832

303

7.9

−20

   

313

9.4

−24

   

 CHEG

298

4.2

−10

0.75

209

0.573

303

9.0

−22

   

313

8.9

−23

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