Surface Area (m²/g)

Non-treated GAC *

HCl

Treatment*

HNO₃ Treatment*

HNO₃+HCl Treatment*

BET Surface Area

583.77

614.42

562.62

573.22

Langmuir Surface Area

792.38

821.55

808.72

821.74

BJH** adsorption cumulative surface area of pores between 17.000 Å and 3000.000 Å diameter.

221.6

228.72

224.23

225.44

BJH desorption cumulative surface area of pores

323.2

342.11

337.55

339.65

Pore Volume (cm³/g)

Single point adsorption total pore volume of pores

0.621

0.643

0.632

0.640

Single point desorption total pore volume of pores

0.648

´0.672

0.659

0.661

BJH adsorption cumulative surface area of pores

0.488

0. 503

0.498

0.523

BJH desorption cumulative surface area of pores

0.537

0.560

0.550

0.557

Pore Size ( Å)

Adsorption average pore width (4V/A by BET):

42.57

47.77

43.11

45.57

Desorption average pore width (4V/A by BET):

44.42

51.51

46.82

48.92

BJH adsorption average pore diameter (4V/A):

88.07

93.05

89.84

90.76

BJH desorption average pore diameter (4V/A):

66.41

71.82

68.52

69.75