Environmental Engineering Reference
In-Depth Information
For the remaining models the average Micropore diameters were calculated from
integration of the PSD curve.
1.2.2.14 AVERAGE MICROPORE DIAMETER (L
AV
),
CHARACTERIZATION ENERGY (E
0
) CALCULATION AND
ADSORPTION CALORIMETRIC DATA
Relation between average micropor diameter (L
av
) and characterization energy
(E
0
), is presented by Eq. (84):
k
(84)
L
=
av
E
0
where is the characteristic constant for a defined adsorbate/adsorbent pair in the
micropore region. The value of this characteristic constant for benzene vapor on
activated carbon is about 12 kJ nm mol
−1
. It has been also assumed that this pa-
rameter is in a small degree dependent on the characteristic energy of adsorption:
−
−×
5
3.5
0
13.028
1.53
10
E
L
=
av
E
(85)
0
Next, others relations were developed since this turning point. The intensive in-
vestigations were done by McEnaney:
(
)
L
=−
6.6
1.79 ln ln
E
(86)
av
0
Stoeckli and co-workers model:
10.8
11.4
L
=
av
E
−
(87)
0
��� �
30
5705
L
=
+
+
0.028
E
−
1.49
€‚€ ‚
av
0
E
E
3
ƒ„ƒ „
0
0
(88)
Choma and Jaroniec model:
� �� �
10.416
13.404
L
=
+
+
0.008212
E
+
0.5114
€ ‚€ ‚
av
0
(89)
E
E
3
ƒ „ƒ „
0
0
and Ohkubo et al.:
-
A
B
C
(
)
-
ln ln
pp
/
=
HK
HK
−
HK
−
D
(90)
s
(
)
HK
Ld
Ld
−
3
9
-
−
/2
�
d
�
L
−
-
€
‚
ƒ
„
2
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