Electron-accepting potential of solvents determines photolysis rates of polycyclic aromatic hydrocarbons: Experimental and density functional theory study
Photochemical behaviour of polycyclic aromatic hydrocarbons (PAHs) is strongly dependent on the physical and chemical nature of the media in/on which they exist To understand the media effects, the photolysis of phenanthrene (PHE) and benzo(apyrene (BaP) in several solvents was investigated. Distinct photolysis rate constants for PHE and BaP in the different solvents were observed. Some theoretical parameters reflecting the solvent properties were computed and employed to explain the solvent effects. Acetone competitively absorbed light with PHE and BaP, and the excited acetone molecules played different roles for the photodegradation of PHE and BaP. The photolysis rate constants of PHE and BaP in hexane, isopropanol, ethanol, methanol, acetonitrile and dichloromethane were observed to correlate with the electron-accepting potential of the solvent molecules. Absolute electronegativity of the solvents linearly correlated with the photolytic activity (log k) of the PAHs significantly. The results are important for better understanding the photodegradation mechanism of PAHs in different media.
Jianping Shao Jingwen Chen Qing Xie Ying Wang Xuehua Li Ce Hao
Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Sc Carbon Research Laboratory, Center for Nano Materials and Science, School of Chemical Engineering, S
国际会议
武汉
英文
432-436
2010-09-01（万方平台首次上网日期，不代表论文的发表时间）