Cioffi Raffaele, De Stefano Luca, Lamanna Raffaele, Montagnaro Fabio, Santoro Luciano, Senatore Stanislao, Zarrelli Armando
Università di Napoli Parthenope, Dipartimento per le Tecnologie, Via Ammiraglio Francesco Acton 38, 80133 Napoli, Italy.
Chemosphere. 2008 Jan;70(6):1068-76. doi: 10.1016/j.chemosphere.2007.07.061. Epub 2007 Sep 24.
This paper deals with the application of mechanochemistry to model systems composed of alumina or silica artificially contaminated with n-C16H34. The mechanochemical treatment was carried out by means of a ring mill for times ranging from 10 to 40h. Thermogravimetry and infrared and nuclear magnetic resonance spectroscopies were used for the characterization of the mechanochemical products. The results have indicated that, in the case of alumina, almost all the contaminant n-C16H34 undergoes a complex oxidative reaction path whose end products are strongly held on the surface. These end products are most likely made of crosslinked, partially oxidized hydrocarbon chains bond to the solid surface via COO(-) groups. In the case of silica, the hydrocarbon undergoes a different, equally complex reaction path, but to a lower extent. In this case the end products are most probably carbonylic compounds and graphitic carbon. Then, for both solid matrices, the mechanochemical treatment promotes significant modification of the chemical nature of the polluting hydrocarbon with end products much more difficult to remove from the surface. As the systems studied are models of sites contaminated by aliphatic hydrocarbon, the results are worthy of consideration in relation to the mobility of the contaminants in the environment.
本文探讨了机械化学在由人工被正十六烷（n-C16H34）污染的氧化铝或二氧化硅组成的模型体系中的应用。机械化学处理通过环磨机进行，处理时间为10至40小时。采用热重分析、红外光谱和核磁共振光谱对机械化学产物进行表征。结果表明，对于氧化铝而言，几乎所有的污染物正十六烷都经历了一条复杂的氧化反应路径，其最终产物牢固地附着在表面。这些最终产物很可能是通过羧基（COO(-)）基团与固体表面相连的交联、部分氧化的烃链。对于二氧化硅，烃经历了不同但同样复杂的反应路径，不过程度较低。在这种情况下，最终产物很可能是羰基化合物和石墨碳。然后，对于这两种固体基质，机械化学处理促进了污染烃化学性质的显著改变，其最终产物更难从表面去除。由于所研究的体系是脂肪烃污染场地的模型，这些结果对于污染物在环境中的迁移性而言值得考虑。
