Fate of amino acids upon exposure to aqueous titania irradiated with UV-A and UV-B radiation - Photocatalyzed formation of NH3, NO3- and CO2

被引：81

作者：

Hidaka, H ^{[1
]}

Horikoshi, S ^{[1
]}

Ajisaka, K ^{[1
]}

Zhao, J ^{[1
]}

Serpone, N ^{[1
]}

机构：

[1] CONCORDIA UNIV, DEPT CHEM & BIOCHEM, LAB PURE & APPL STUDIES CATALYSIS ENVIRONM & MAT, MONTREAL, PQ H3G 1M8, CANADA

来源：

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY | 1997年 / 108卷 / 2-3期

关键词：

photodegradation; photooxidation; photocatalysis; titanium dioxide; amino acid;

D O I：

10.1016/S1010-6030(97)00089-0

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The fate of nitrogen in various amino acids was examined following their photooxidative (and/or reductive) transformation catalyzed by UV-A and UV-B illuminated aqueous TiO2 dispersions. The nitrogens in the amino acids are photoconverted predominantly into NH, (analyzed as NH4+) and to a lesser extent into NO3- ions; NH4+/NO3- ratios span the range 3-12 after ca. 8 h irradiation. Extensive evolution of CO2 is also observed; in some cases it is quantitative. Variations in the NH4+/NO3- ratio in the transformation of amino acids are dependent on the substrates molecular structure. Some of the steps in an otherwise complex mechanism of the heterogeneous photocatalyzedmineralization are described. (C) 1997 Elsevier Science S.A.

引用

页码：197 / 205

页数：9

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