Photosensitized CN<sup>-</sup> oxidation over TiO<inf>2</inf>

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Abstract

The oxidation of cyanide catalyzed by TiO2 under UV illumination is investigated. The study was performed by determining the yield of cyanide photo-oxidation using different initial cyanide concentrations, irradiation times, masses of semiconductor in suspension, light intensities, pH values and temperatures. It was observed that during the first minutes of irradiation CNO- was the main product of oxidation, but at long irradiation times all the cyanide was converted to CO32-. From the kinetic analysis performed by using the experimental data, it is deduced that the rate constant of the cyanide oxidation by photogenerated holes is 70% greater than the corresponding rate constant of the water oxidation. Finally, some experiments using a continuous flow photoreactor were carried out. With this system a good yield for the removal of cyanide, which could be maintained for at least 9 h, is reported. © 1990.
Original languageEnglish
Pages (from-to)251-257
JournalJournal of Photochemistry and Photobiology, A: Chemistry
Volume55
Issue number2
DOIs
Publication statusPublished - 20 Dec 1990

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