Turhan Kadir, Uzman Suheyla
Yildiz Technical University, Department of Chemistry, 34210 Istanbul, Turkiye.
Ann Chim. 2007 Oct;97(10):1129-38. doi: 10.1002/adic.200790096.
Aromatic compounds are extensively used in several industries and can cause pollution in water sources. This work aims at examining the degradability of aniline in aqueous solutions by ozone-induced cleavage, and at determining the kinetics of the cited cleavage reactions. Aniline was prepared in four different concentrations and the flow rate of ozone supplied to each solution was selected. Aniline solutions were ozonated at low and high pH, so as to compare both molecular and hydroxyl free radical mechanisms, respectively. The main identified aromatic by-products were nitrobenzene and azobenzene when the experiment was carried out at acidic pH. Formation of nitrobenzene, azobenzene, azoxybenzene and 2-pyridine carboxylic acid (picolinic acid) was observed when the ozonization was carried out at basic pH. All the aromatic by-products found were less toxic than the raw materials. The pseudo-first-order constants in aniline concentrations were calculated.
芳香族化合物在多个行业中被广泛使用，并且会导致水源污染。这项工作旨在研究臭氧诱导裂解作用下苯胺在水溶液中的可降解性，并确定上述裂解反应的动力学。制备了四种不同浓度的苯胺溶液，并选择了供应给每种溶液的臭氧流速。苯胺溶液在低pH和高pH条件下进行臭氧化处理，以便分别比较分子机制和羟基自由基机制。当实验在酸性pH条件下进行时，主要鉴定出的芳香族副产物是硝基苯和偶氮苯。当在碱性pH条件下进行臭氧化处理时，观察到了硝基苯、偶氮苯、氧化偶氮苯和2-吡啶羧酸（皮考林酸）的形成。发现的所有芳香族副产物的毒性均低于原料。计算了苯胺浓度下的准一级常数。
