Abstract
The sorptive and desorptive behavior of 1,2,4-Trichlorobenzene (TCB) was studied in a mixture of river sediments and TCB at initial aqueous concentrations of 0.5, 4, and 21 mg/L. All experiments were performed at a temperature of 20∘C and at pH 5.58. Grain size, fraction of organic carbon (FOC), and pH analyses were conducted to determine the initial condition of the sediment. Adsorption experiments reached equilibrium 8 hours after the start of the experiment. Adsorption data were used to calculate the monolayer sorption capacity (Q), the Langmuir entropy constant (b), the Freundlich adsorption coefficients (Kd, Kd′), and the Freundlich characteristic constant (n) as well as R-square values. Desorption experiments utilized a 4 g/L persulfate solution added to soils “pre-contaminated” with TCB during the adsorption experiments. Studies indicated that persulfate was an effective oxidizer of both sediment organic matter and TCB. After a contact time of 5 hours, the mass of sediment organic carbon was reduced from 4.45% to 0.44%. The TCB released to solution with organic matter oxidation was then oxidized to non-detectable levels by persulfate and the possible presence of free radicals. The conclusions were made that persulfate has the potential to be an effective oxidizer of both TCB and sediment organic matter.
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Barbash, A.M., Hoag, G.E. & Nadim, F. Oxidation and Removal of 1,2,4-Trichlorobenzene using Sodium Persulfate in a Sorption-Desorption Experiment. Water Air Soil Pollut 172, 67–80 (2006). https://doi.org/10.1007/s11270-005-9052-3
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DOI: https://doi.org/10.1007/s11270-005-9052-3