Vione Davide, Maurino Valter, Minero Claudio, Vincenti Marco, Pelizzetti Ezio
Dipartimento di Chimica Analitica, Università di Torino, Via P. Giuria 5, I-10125 Torino, Italy.
Environ Sci Pollut Res Int. 2003;10(5):321-4. doi: 10.1065/espr2001.12.104.1.
This work describes the nitration of aromatics upon near-UV photolysis of nitrate and nitrite in aqueous solution and upon photocatalytic oxidation of nitrite in TiO2 suspensions. Phenol is used in this work as a model aromatic molecule and as a probe for *NO2/N2O4. The photoinduced nitration of phenol in aqueous systems occurs upon the reaction between phenol and *NO2 or N2O4, and is enhanced by the photocatalytic oxidation of nitrite to *NO2 by TiO2. Aromatic photonitration in the liquid phase can play a relevant role in the formation of nitroaromatics in natural waters and atmospheric hydrometeors, thus being a potential pathway for the condensed-phase nitration of aromatics. Furthermore, the photoinduced oxidation of nitrite to nitrogen dioxide suggests a completely new role for nitrite in natural waters and atmospheric aerosols.
这项工作描述了在水溶液中硝酸盐和亚硝酸盐的近紫外光解以及在TiO₂悬浮液中亚硝酸盐的光催化氧化过程中芳烃的硝化反应。在这项工作中，苯酚用作模型芳香分子以及NO₂/N₂O₄的探针。水体系中苯酚的光致硝化反应发生在苯酚与NO₂或N₂O₄之间的反应，并且通过TiO₂将亚硝酸盐光催化氧化为*NO₂而增强。液相中的芳香族光硝化反应在天然水体和大气水凝物中硝基芳烃的形成过程中可能起重要作用，因此是芳烃凝聚相硝化的潜在途径。此外，亚硝酸盐光致氧化为二氧化氮表明亚硝酸盐在天然水体和大气气溶胶中具有全新的作用。
