Photodegradation Mechanisms of 1-Nitropyrene, an Environmental Pollutant: The Effect of Organic Solvents, Water, Oxygen, Phenols, and Polycyclic Aromatics on the Destruction and Product Yields
作者:Zulma I. García-Berríos、Rafael Arce
DOI:10.1021/jp2126416
日期:2012.4.12
ϕ(-1-NO2Py), was larger in toluene, benzene, and polar protic solvents (10–3) in comparison with nonpolar and polar aprotic solvents, where the yield is on the order of 10–4. In solvents with an abstractable hydrogen atom, the products formed in higher yields were 1-OHPy and 1-OH-x-NO2Py. These represent 60–80% of the photodestruction yield and result from abstraction and recombination reactions of the pyrenoxy
这项工作描述了在由有机溶剂和气溶胶颗粒的已知成分组成的化学模型系统中对 1-硝基芘 (1-NO 2 Py) 的光降解机制的研究。光产物如 1-羟基芘 (1-OHPy)、1-羟基- x -硝基芘 (1-OH- x -NO 2 Py)、1-亚硝基芘以及 1,6- 和 1,8-芘二酮通过高-高效液相色谱(HPLC)和高效液相色谱/质谱(HPLC/MS)技术,其量子产率显示出对溶剂类型的显着依赖性。与非极性和极性非质子溶剂相比,1-NO 2 Py 的光降解量子产率在甲苯、苯和极性质子溶剂 (10 –3 ) 中更大,其中产率在10 – 4的顺序。在具有可提取氢原子的溶剂中,以较高收率形成的产物是1-OHPy和1-OH- x -NO 2 Py。这些代表了 60-80% 的光破坏产率,是芘氧基自由基的提取和重组反应的结果,芘氧基自由基是硝基芳族化合物中硝基-亚硝酸盐重排的中间产物。 O 2对光降解产率的