Abstract
Dense nonaqueous phase (DNAPL) trichloroethylene (TCE) degradation by potassium permanganate (KMnO4) was investigated in the presence of the cationic surfactant pentyltriphenylphosphonium (PTPP) bromide, acting as a phase transfer catalyst. Series of batch tests were performed in 5.0-mL conical vials containing Milli-Q water and 1.0 mM DNAPL TCE with initial permanganate concentrations ([MnO4 −]0) of 1.0, 2.0, 3.0, and 5.0 mM, adding PTPP (0, 10, and 20 mol% of permanganate, respectively). Chloride ion (Cl−) and MnO4 − in water samples were analyzed to observe MnO4 − consumption and TCE degradation over the elapsed time (0 to 90 min). The calculated values of pseudo first-order rate constants for MnO4 − consumption indicated that the rate of MnO4 − depletion increased with higher mole percent PTPP. At experimental conditions of 1.0 and 2.0 mM [MnO4 −]0, analyses of Cl− concentration showed that higher mole percent of PTPP induced greater Cl− release, indicating faster TCE oxidation. On the other hand, for 3.0 and 5.0 mM [MnO4 −]0, the concentration of Cl− was lower with the presence of PTPP. This result indicated that MnO4 − had migrated further into the inner space of DNAPL, and consequently, the Cl− took a longer time to diffuse from DNAPL to an aqueous phase.
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Kim, K., Kim, Y.S. & Gurol, M.D. DNAPL TCE Oxidation with Permanganate: Influence of the Phase Transfer Catalyst Pentyltriphenylphosphonium. Water Air Soil Pollut 224, 1735 (2013). https://doi.org/10.1007/s11270-013-1735-6
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DOI: https://doi.org/10.1007/s11270-013-1735-6