Some observations about the photocatalytic oxidation of cyanate to nitrate over TiO2

Agustín Bravo; Josep Garcia; Xavier Domènech; José Peral

doi:10.1016/0013-4686(94)E0072-V

Some observations about the photocatalytic oxidation of cyanate to nitrate over TiO₂

Agustín Bravo, Josep Garcia, Xavier Domènech, José Peral

Department of Chemistry

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

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Abstract

The photocatalytic oxidation of cyanate ions in aqueous solution and in the presence of TiO 2 takes place by two different reaction pathways, depending on the solution pH. For pHs lower than 10, the main oxidation product is nitrate instead of N 2 , as reported previously. The hydrolysis of cyanate seems to be the reason for this change of mechanism with pH. NH +4 is formed by CNO - hydrolysis, and its photo-oxidation gives nitrite and nitrate. The hydrolysis rate controls the speed of the whole process, but the photo-oxidation of CNO - to N 2 appeared to be faster in a strongly basic medium. For values of pH lower than 5, NH +4 is hardly oxidized, remaining stable in solution. © 1994.

Original language	English
Pages (from-to)	2461-2463
Journal	Electrochimica Acta
Volume	39
Issue number	16
DOIs	https://doi.org/10.1016/0013-4686(94)E0072-V
Publication status	Published - 1 Jan 1994

Keywords

cyanate
oxidation
photocatalysis TiO 2
semiconductor.

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title = "Some observations about the photocatalytic oxidation of cyanate to nitrate over TiO2",

abstract = "The photocatalytic oxidation of cyanate ions in aqueous solution and in the presence of TiO 2 takes place by two different reaction pathways, depending on the solution pH. For pHs lower than 10, the main oxidation product is nitrate instead of N 2 , as reported previously. The hydrolysis of cyanate seems to be the reason for this change of mechanism with pH. NH +4 is formed by CNO - hydrolysis, and its photo-oxidation gives nitrite and nitrate. The hydrolysis rate controls the speed of the whole process, but the photo-oxidation of CNO - to N 2 appeared to be faster in a strongly basic medium. For values of pH lower than 5, NH +4 is hardly oxidized, remaining stable in solution. {\textcopyright} 1994.",

keywords = "cyanate, oxidation, photocatalysis TiO 2, semiconductor.",

author = "Agust{\'i}n Bravo and Josep Garcia and Xavier Dom{\`e}nech and Jos{\'e} Peral",

year = "1994",

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journal = "Electrochimica Acta",

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TY - JOUR

T1 - Some observations about the photocatalytic oxidation of cyanate to nitrate over TiO2

AU - Bravo, Agustín

AU - Garcia, Josep

AU - Domènech, Xavier

AU - Peral, José

PY - 1994/1/1

Y1 - 1994/1/1

N2 - The photocatalytic oxidation of cyanate ions in aqueous solution and in the presence of TiO 2 takes place by two different reaction pathways, depending on the solution pH. For pHs lower than 10, the main oxidation product is nitrate instead of N 2 , as reported previously. The hydrolysis of cyanate seems to be the reason for this change of mechanism with pH. NH +4 is formed by CNO - hydrolysis, and its photo-oxidation gives nitrite and nitrate. The hydrolysis rate controls the speed of the whole process, but the photo-oxidation of CNO - to N 2 appeared to be faster in a strongly basic medium. For values of pH lower than 5, NH +4 is hardly oxidized, remaining stable in solution. © 1994.

AB - The photocatalytic oxidation of cyanate ions in aqueous solution and in the presence of TiO 2 takes place by two different reaction pathways, depending on the solution pH. For pHs lower than 10, the main oxidation product is nitrate instead of N 2 , as reported previously. The hydrolysis of cyanate seems to be the reason for this change of mechanism with pH. NH +4 is formed by CNO - hydrolysis, and its photo-oxidation gives nitrite and nitrate. The hydrolysis rate controls the speed of the whole process, but the photo-oxidation of CNO - to N 2 appeared to be faster in a strongly basic medium. For values of pH lower than 5, NH +4 is hardly oxidized, remaining stable in solution. © 1994.

KW - cyanate

KW - oxidation

KW - photocatalysis TiO 2

KW - semiconductor.

U2 - 10.1016/0013-4686(94)E0072-V

DO - 10.1016/0013-4686(94)E0072-V

M3 - Article

VL - 39

SP - 2461

EP - 2463

JO - Electrochimica Acta

JF - Electrochimica Acta

SN - 0013-4686

IS - 16

ER -