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

José Peral; Javier Muñoz; Xavier Domènech

doi:10.1016/1010-6030(90)80036-W

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

José Peral, Javier Muñoz, Xavier Domènech

Department of Chemistry

Research output: Contribution to journal › Article › Research › peer-review

46 Citations (Scopus)

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 language	English
Pages (from-to)	251-257
Journal	Journal of Photochemistry and Photobiology, A: Chemistry
Volume	55
Issue number	2
DOIs	https://doi.org/10.1016/1010-6030(90)80036-W
Publication status	Published - 20 Dec 1990

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title = "Photosensitized CN- oxidation over TiO2",

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. {\textcopyright} 1990.",

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AU - Peral, José

AU - Muñoz, Javier

AU - Domènech, Xavier

PY - 1990/12/20

Y1 - 1990/12/20

N2 - 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.

AB - 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.

U2 - 10.1016/1010-6030(90)80036-W

DO - 10.1016/1010-6030(90)80036-W

M3 - Article

VL - 55

SP - 251

EP - 257

IS - 2

ER -

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

Abstract

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