Environmental Engineering Reference
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Equilibrium Aqueous
Adsorbed
Concentration (
μ
g/L)
Concentration (ng/g)
5.1
35.6
7.0
51.8
9.7
51.9
13.4
67.2
13.0
70.9
The molecular weight of pyrene is 202 and its aqueous solubility is
130 μ g/L. Obtain the linear partition constant (in L/kg) for pyrene between
the sediment and water. What is the adsorption free energy for pyrene on
this sediment?
3.41 2 The following data were obtained by Poe et al. (1988) for the adsorp-
tion of an aromatic pollutant (benzene) on an Arkansas soil (Weller soil,
Fayetteville, AR). Plot the data as a BET isotherm and obtain the BET
constants. From the BET constants obtain the surface area of the soil and
the adsorption energy for benzene on this soil.
Relative Vapor Pressure
Amount Adsorbed (mg/g)
0.107
7.07
0.139
10.68
0.253
14.18
0.392
18.32
0.466
20.89
0.499
22.15
3.42 2 The following data were reported by Karger (1971) for the adsorption of
hydrocarbon ( n -nonane) vapor on a water surface at 12.5 C.
Relative Partial
Amount Adsorbed
(mol/cm 2 )
Pressure
0.20 × 10 11
0.07
0.12
0.36
0.17
0.48
0.22
0.60
0.25
0.78
0.30
0.94
0.34
1.12
0.38
1.26
0.43
1.48
0.47
1.68
0.52
1.88
0.56
2.10
What type of an isotherm do these data represent? Obtain the isotherm
constants and the free energy of adsorption. The reported free energy of
adsorption of 12.5 Cis 4.7 kcal/mol.
 
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