Remediation of PAHs, NSO-Heterocycles, and Related Aromatic Compounds in Permeable Reactive Barriers Using Activated Carbon - Permeable Reactive Barrier: Sustainable Groundwater Remediation - page 229

400

200

100

6 80

40

20

10

Acenaphthene

9-Methylacridine

4

Phenanthene

Dibenzothiophene
Benzene

2

1

0.001 0.01 0.1 1 10 100 1000

c eq /mg L -1

FIGURE 11.5
Adsorption isotherms for acenaphthene, 9-methylacridine, phenanthrene, and dibenzo-
thiophene and for benzene (for comparison) on the activated carbon Epibon Y12×40 (sieved
63-125 μm) in deionized water at T ± σ = 20 ± 3°C. Curves are from the results of the Langmuir-
Freundlich model. Data in parenthesis are defined as outliers and not used. Linear regression
for benzene represents the Freundlich model.

250 1.0

2-Methylquinoline
c 0 = 11-24 mg/L

Exp. load (calculated using
Freundlich model)

0.8

200

Fit exp. load

Calculated load of
mixture (IAS, Freundlich)

0.6

Fraction neutral molecule
in solution (pK a = 5.86)

150

0.4

100

0.2

50 0.0

2 3 4 5 6 7 8

pH

FIGURE 11.6
The adsorption loads of 2-methylquinoline on AC Epibon Y12×40 evaluated from pH-
dependent Freundlich isotherms ( T = 20°C). In addition, loads calculated with the IAS-model
and the neutral fraction present in the solution are shown.