Abstract
The treatment of perchloroethylene (PCE) was investigated by the promotion of Fenton-like reactions using the iron oxyhydroxide goethite (α-FeOOH) as the sole source of the iron catalyst. A silica sand-goethite matrix was contaminated with 5 mg L−1 PCE and the oxidative treatments were conducted with 0.15 mM, 2 mM, 5mM, 10mM, 20mM, and 30mM H2O2. Perchloroethylene was effectively degraded within 96 hr and the most efficient treatment stoichiometry was observed using 0.15 mM H2O2 at pH 3. The degree of heterogeneous catalysis was evaluated by conducting oxidation reactions in parellel systems with an equivalent concentration of soluble iron. The results showed that, within the first 24 hr, up to 94% of the PCE degradation was attributed to heterogeneous catalysis. This modified Fenton's process, when used to treat 5 mg L−1 PCE in natural subsurface materials with 2 mM H2O2 at pH 3, resulted in a residual of 0.20 mg L−1 PCE after 96 hr.
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Jafar Khan, M.A., Watts, R.J. Mineral-catalyzed peroxidation of tetrachloroethylene. Water Air Soil Pollut 88, 247–260 (1996). https://doi.org/10.1007/BF00294104
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DOI: https://doi.org/10.1007/BF00294104