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Verwertbare Ergebnisse
The work concentrated on the photodegradation of toxic organic compounds found in industrial effluent, particularly chlorophenols but also polycyclic aromatic hydrocarbons.
The photo-oxidants examined were in solution (uranyl ion, tris(2,2'-bipyridyl)ruthenium(II) persulfate), adsorbed onto supports (uranyl ion on zeolites, Rose Bengal with Diapak, a C-18 functionalized silica) or thin films (titanium dioxide). A second problem related to the oxidation of SO2 and NOx in the droplet phase as found in flue gases from power stations, in particular the role of trace transition metal ions.
Key results include:
-observation of the production of the extremely toxic dibenzodioxins from the direct photolysis of polychlorinated phenols.
-the heterogeneous catalyst system, Rose Bengal in solution contacting Diapak, causes the photodegradation of benzpyrene both adsorbed on the silica surface and localized in the non-polar phase of the hydrocarbon chains.
-the efficacy of the complex formed between vanadate ion and pyrazine-2-carboxylic acid in catalyzing the H2O2 oxidation of a wide range of organic compounds including polychlorinated phenols
-the demonstration using a channel flow reactor that the kinetics of photomineralization of 4-chlorophenol over a TiO2 film can be explained exclusively in terms of a surface-limited process but only if the effect of mass transfer is taken into account.
-trace amounts of both Fe2+ and Mn2+ ions exhibit synergism in the oxidation of sulfite ions in flue gases by ionizing radiation.
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