Dark and photoassisted Fe3+-catalyzed degradation of chlorophenoxy herbicides by hydrogen peroxide

Article Abstract:

The application of hydrogen peroxide and iron salts as an oxidant for degrading aqueous pesticide wastes was examined. The degradation of two herbicides in acidic aerated solutions of hydrogen peroxide and Fe2+ or Fe3+ was studied. Particular attention was paid to Fe3+/H2O2 because of its ability to create an environment that would result in complete mineralization. The results indicated that photoassisted Fe3+/H2O2 could serve as an alternative method for destroying pesticide wastes.

Usage, Catalysts, Herbicides, Hydrogen peroxide, Chlorophenoxyacetic acid

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Reduction of perchloroalkanes by ferrioxalate-generated carboxylate radical preceding mineralization by the photo-Fenton reaction

Article Abstract:

The photolysis of aqueous solutions with Fe(III) and oxalate was analyzed to determine the kinetics of CCl4 and hexachloroethane (C2Cl6) decomposition reactions. CCl4 exhibited 5%-10% decomposition during photolysis in photo-Fenton chemical reactions. Photo-Fenton chemical reactions also produced a 38% yield of C2Cl6 and Fe(II). Furthermore, carbon tetrachloride radicals were produced by the reduction of CCl4 followed by the formation of C2Cl4 from C2Cl6.

Analysis, Oxidation-reduction reaction, Oxidation-reduction reactions, Oxidizing agents, Carbon tetrachloride

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Role of quinone intermediates as electron shuttles in fenton and photoassisted fenton oxidations of aromatic compounds

Article Abstract:

Quinones appear to act as electron-transfer catalysts between dihydroxycyclohexadienyl radical and Fe 3+ by way of a semiquinone radical in the fenton and photoassisted fenton oxidation of aromatic compounds. Results from the oxidation of phenol by fenton systems in the dark and under ultra violet and visible light indicated autocatalysis. Photolysis of quinone to HO. and semiquinone radicals resulted to the reduction of Fe 3+ to Fe 2+.

All Other Basic Inorganic Chemical Manufacturing, Cyclic crudes and intermediates, Cyclic Crude and Intermediate Manufacturing, Industrial inorganic chemicals, not elsewhere classified, Phenol, Iron Compounds NEC, Phenols, Phenols (Class of compounds), Iron, Iron (Metal), Phenol (Compound), Iron compounds, Quinone, Quinones

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