Phototransformations of dinitropyrene isomers on models of the atmospheric particulate matter.
Phototransformations of dinitropyrene isomers on models of the atmospheric particulate matter.
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DOI：
10.1016/j.atmosenv.2013.04.035
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发表时间：
2013-08-01
影响因子：
5
通讯作者：
Morel, Maria
中科院分区：
文献类型：
--
作者：
Arce, Rafael;Morel, Maria
1，6和1，8-二硝基芘（DNP）异构体是柴油机尾气和空气颗粒物中遇到的强诱变剂和致癌物。测定了相对光降解率，并对这些异构体经辐照后吸附到大气物质模型上的某些产物进行了表征。这些是比较它们在极性非质子溶剂中的光化学行为。1，8-DNP异构体是三倍以上的1，6-DNP的反应时，照射吸附到硅胶表面上，而相反的顺序在溶液中观察到，证明了结构差异和环境效应的影响的光反应性。氧是在溶液中和在硅胶上由1，8-DNP形成芘二酮的关键因素，而对于1，6-DNP则不是这种情况。二氧化硅表面的平均孔径（2.5对6.0 nm）引起产物分布和1，8-DNP的相对产率的显著变化，因为在较小孔径的二氧化硅中不产生芘二酮或8-羟基-1-硝基芘。在酸性氧化铝和二氧化硅（6.0 nm）表面都观察到6-羟基-1-硝基芘产物。在酸性氧化铝的异构体的光转化率是相等的，一个显着增加的羟基硝基芘产品的相对产率相比，观察到的二氧化硅和未识别的产品，其中没有NO2和芘的吸收带，观察到，证明了表面效应的光降解。总的来说，一些产品的存在下，表明在表面上的一个pyrenoxy自由基作为其前体的参与硝基-亚硝酸盐重排的发生。
The 1,6 and 1,8-dinitropyrenes (DNP) isomers are strong mutagens and carcinogens encountered in diesel exhaust and airborne particles. Relative photodegradation rates were determined and some products were characterized when these isomers were irradiated adsorbed onto models of the atmospheric matter. These are compared to their photochemical behavior in a polar nonprotic solvent. The 1,8-DNP isomer is three times more reactive than the 1,6-DNP when irradiated adsorbed onto silica gel surfaces, while the reverse order is observed in solution, demonstrating the influence of structural differences and environmental effects on the photoreactivity. Oxygen is a key factor in the formation of pyrenediones from 1,8-DNP in solution and on silica gel which is not the case for 1,6-DNP. The average pore diameter (2.5 versus 6.0 nm) of the silica surfaces induces a significant change in the product distribution and relative yields of 1,8-DNP because pyrenediones or 8-hydroxy-1-nitropyrene are not produced in the smaller pore silica. A 6-hydroxy-1-nitropyrene product is observed both in acidic alumina and silica (6.0 nm) surfaces. On acidic alumina the rates of phototransformation of the isomers are equal, a significant increase in the relative yield of the hydroxynitropyrene product is observed compared to the silica and unidentified products in which the absence of NO2 and pyrene absorption bands were observed, demonstrating the surface effect on the photodegradation. Overall, the presence of some products indicates the occurrence of a nitro-nitrite rearrangement on the surface with the participation of a pyrenoxy radical as their precursor.
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影响因子：
2.8
作者：
JAMES, DR;LIU, YS;WARE, WR
通讯作者：
WARE, WR
影响因子：
11.4
作者：
MCDOW, SR;SUN, QR;KAMENS, RM
通讯作者：
KAMENS, RM
影响因子：
1.8
作者：
DEMAYO, P
通讯作者：
DEMAYO, P
DOI：
10.1016/0165-1218(85)90092-8
发表时间：
1985-01-01
期刊：
MUTATION RESEARCH
影响因子：
--
作者：
MANABE, Y;KINOUCHI, T;OHNISHI, Y
通讯作者：
OHNISHI, Y
影响因子：
12.8
作者：
Murahashi, T;Ito, M;Hayakawa, K
通讯作者：
Hayakawa, K