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Perchloroethylene (PCE) oxidation by percarbonate in Fe(2+)-catalyzed aqueous solution: PCE performance and its removal mechanism. 2015

Zhouwei Miao, and Xiaogang Gu, and Shuguang Lu, and Xuke Zang, and Xiaoliang Wu, and Minhui Xu, and Landry Biyoghe Bi Ndong, and Zhaofu Qiu, and Qian Sui, and George Yuzhu Fu
State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China.

The performance of Fe(2+)-catalyzed sodium percarbonate (SPC) stimulating the oxidation of perchloroethylene (PCE) in groundwater remediation was investigated. The experimental results showed that PCE could be completely oxidized in 5 min at 20 °C with a Fe(2+)/SPC/PCE molar ratio of 8/8/1, indicating the effectiveness of Fe(2+)-catalyzed SPC oxidation for PCE degradation. Fe(2+)-catalyzed SPC oxidation was suitable for the nearly neutral pH condition, which was superior to the conventional Fenton oxidation in acidic condition. In addition, the investigations by using hydroxyl radical scavengers and free radical probe compounds elucidated that PCE was degraded mainly by hydroxyl radical (HO) oxidation in Fe(2+)/SPC system. In conclusion, Fe(2+)-catalyzed SPC oxidation is a highly promising technique for PCE-contaminated groundwater remediation, but more complex constituents in groundwater should be carefully considered for its practical application.

UI MeSH Term Description Entries
D007501 Iron A metallic element with atomic symbol Fe, atomic number 26, and atomic weight 55.85. It is an essential constituent of HEMOGLOBINS; CYTOCHROMES; and IRON-BINDING PROTEINS. It plays a role in cellular redox reactions and in the transport of OXYGEN. Iron-56,Iron 56
D010084 Oxidation-Reduction A chemical reaction in which an electron is transferred from one molecule to another. The electron-donating molecule is the reducing agent or reductant; the electron-accepting molecule is the oxidizing agent or oxidant. Reducing and oxidizing agents function as conjugate reductant-oxidant pairs or redox pairs (Lehninger, Principles of Biochemistry, 1982, p471). Redox,Oxidation Reduction
D002254 Carbonates Salts or ions of the theoretical carbonic acid, containing the radical CO2(3-). Carbonates are readily decomposed by acids. The carbonates of the alkali metals are water-soluble; all others are insoluble. (From Grant & Hackh's Chemical Dictionary, 5th ed) Carbonate
D002384 Catalysis The facilitation of a chemical reaction by material (catalyst) that is not consumed by the reaction. Catalyses
D006863 Hydrogen-Ion Concentration The normality of a solution with respect to HYDROGEN ions; H+. It is related to acidity measurements in most cases by pH pH,Concentration, Hydrogen-Ion,Concentrations, Hydrogen-Ion,Hydrogen Ion Concentration,Hydrogen-Ion Concentrations
D013750 Tetrachloroethylene A chlorinated hydrocarbon used as an industrial solvent and cooling liquid in electrical transformers. It is a potential carcinogen. Perchloroethylene,Perchlorethylene,Tetrachlorethylene,Tetrachloroethene
D014874 Water Pollutants, Chemical Chemical compounds which pollute the water of rivers, streams, lakes, the sea, reservoirs, or other bodies of water. Chemical Water Pollutants,Landfill Leachate,Leachate, Landfill,Pollutants, Chemical Water
D017665 Hydroxyl Radical The univalent radical OH. Hydroxyl radical is a potent oxidizing agent.
D060587 Groundwater Liquid water present beneath the surface of the earth. Aquifers,Ground Water,Ground-Water,Subterranean Lakes,Underground Lakes,Underground Streams,Underground Water,Water Table,Aquifer,Ground Waters,Ground-Waters,Groundwaters,Lake, Subterranean,Lake, Underground,Lakes, Subterranean,Lakes, Underground,Stream, Underground,Streams, Underground,Subterranean Lake,Table, Water,Tables, Water,Underground Lake,Underground Stream,Underground Waters,Water Tables,Water, Underground,Waters, Underground

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